Is surgery always needed for an anal fistula?

Some narrative reviews say chronic fistula-in-ano always needs surgery, but these are opinion pieces without original data behind them. Observational studies show some fistulas do close with non-surgical treatment, though the evidence is limited and not based on trials.

Do antibiotics alone cure a fistula?

One retrospective study of first-time abscesses found antibiotics after drainage were linked to lower rates of later fistula surgery, but this was studied in people with abscesses, not confirmed chronic fistulas, so it doesn't directly answer whether antibiotics cure an existing fistula.

Should I stop non-surgical treatment if it isn't working?

These studies show non-surgical treatments fail to close the fistula in a meaningful share of people — for example, under half with chemical ablation in one study. If discharge, pain, or swelling continues, it's reasonable to see a colorectal surgeon about other options.

Is a fistula plug better than surgery?

One review found fistula plugs had a higher recurrence rate than conventional surgery (62% vs 47%), with no difference in incontinence between the two. This suggests surgery closed fistulas more reliably in that comparison, though it wasn't a randomized trial.

Can an anal fistula heal without surgery, or is surgery always needed?

Name: Can an anal fistula heal without surgery, or is surgery always needed?
Published: 2026-10-24
Keywords: Anal Fistula: Surgery vs Non-Surgical Options

In adults with a cryptoglandular anal fistula (fistula-in-ano), does non-surgical management (e.g., antibiotics, observation, seton drainage alone, or other conservative measures) achieve fistula closure and prevent recurrence compared with surgical treatment (fistulotomy, LIFT, advancement flap, or other operative repair)?

Evidence review in plain language · compiled 2026-10-24 · checked 2026-10-24 · next 2026-11-24 · automated review, how it works

Bottom line

In small, non-randomized studies, many anal fistulas closed without surgery using treatments like silver nitrate irrigation, biologic plugs, or outpatient wire drainage, but it is unclear whether non-surgical methods close fistulas as reliably as surgery.

Across these observational studies, non-surgical closure rates ranged from about 44% to 76% depending on the method, and a separate outpatient wire-drainage study reported recurrence in only 2 of 56 patients. One retrospective study compared surgical and non-surgical plug placement within the same group of patients and found one surgical technique healed more fistulas than either the non-surgical approach or a different surgical technique, which gave similar results to each other. None of these studies were randomized, so the overall comparison between non-surgical and surgical treatment remains uncertain.

How well studied

Some evidence

Only observational evidence addresses this question (4 studies).

This question weighs several approaches rather than testing one treatment, so there is no single works-or-doesn't verdict. What can be shown is how well it has been studied.

answer it directly: 5answer it directly
studies found: 16studies found
randomised trials: 0randomised trials
people studied: 1,629people studied
reviews of trials: 3reviews of trials
years covered: 1987–2025years covered

What the research shows

Fistula healing or closure rate
Across four observational studies, non-surgical treatments closed the fistula in 44% to 76% of people, depending on the method used and the type of fistula treated.[1,2,3,4]
Some evidence
Recurrence rate at 12 months
Only one small case series reported recurrence specifically — 2 of 56 people after a non-surgical wire drainage technique. Other studies did not report recurrence at a fixed 12-month point.[1]
Too little evidence
Time to complete healing
No study reported the actual time from starting treatment to complete fistula closure. One study followed patients for a wide range of time (7 to 64 months) while tracking whether healing occurred, but this describes how long patients were observed, not how quickly fistulas actually closed.[1]
Not studied
Fecal incontinence rate
Some small case series reported no incontinence after non-surgical treatment, but numbers were too small and comparisons to surgery too inconsistent to draw a reliable conclusion.[1,2,3]
Too little evidence
Need for repeat or salvage surgery
One retrospective study of first-time abscesses found most people who had drainage alone did not need fistula surgery afterward, but this was in new abscesses, not confirmed chronic fistulas.[1]
Too little evidence
Persistent discharge or abscess recurrence
A small case series combining seton drainage with fibrin glue found a new abscess developed in 2 of 30 people after apparent healing. Other studies did not track this outcome consistently.[1]
Too little evidence

What the studies found

Chemical ablation with silver nitrate closed the fistula without surgery in 44% to 76% of patients across two prospective cohort studies.[1,2]
A biologic fistula plug placed without surgery closed the fistula in about 74% of patients with complex, often previously-operated fistulas, with no incontinence reported.[1]
A non-operative wire drainage technique for horseshoe fistulas resulted in recurrence in only 2 of 56 patients, with no incontinence reported.[1]
An outpatient platelet-rich fibrin plug, placed without anaesthesia, achieved healing similar to one surgical technique, with no difference in complication or continence rates.[1]

Important limitations

None of the available studies are randomized trials. They are prospective or retrospective observational cohorts, non-randomized comparisons between treatment groups, or small case series, which cannot rule out that people who healed simply had easier-to-treat fistulas to begin with.[1,2,3,4,5]
Sample sizes are small (30 to 186 people) and mostly from single centers, so results may not generalize.[1,2,3,4]
These are narrative reviews, not original research. [8] states that perianal fistulas will not heal on their own but also describes conservative options such as fibrin glue or a plug; [11] states that fistula treatment is surgical in all cases but also describes sphincter-sparing options like seton drainage, fibrin glue, plug placement, or LIFT, while asserting (without supporting numbers) that these lead to more recurrence than radical surgery; [16] states that chronic fistula-in-ano requires fistulotomy. None of the three reports original data, patient counts, or study results to back these statements.[1,2,3]
Several related studies used populations that are not typical adult cryptoglandular fistula patients — infants, pessary-related fistulae, neutropenic cancer patients, or post-surgical anastomotic leaks — so they only indirectly inform this question.[1,2,3,4,5]

What kind of studies

Retrospective5 · 31%
Narrative review3 · 19%
Case series3 · 19%
Systematic review2 · 13%
Prospective cohort2 · 13%
Meta-analysis1 · 6%

The key studies

Attaallah et al. 2021
Chemical Ablation for Treating Anal Fistulas without Surgical Intervention: Long-Term Results
Fistula healed without surgery in under half.Prospective cohortLow quality
186 peoplemedian 50 (7-64) months
Less than half (44%) of patients achieved complete clinical healing without surgery; healing was more likely in those with intermittent discharge and in fistulas without abscesses or secondary tracts
Who was studied
Adults with symptomatic perianal (anal) fistula
What they received
Chemical ablation of the fistula tract with 5% silver nitrate solution (non-surgical)
Main outcome
Rate of complete clinical healing of the fistula over long-term follow-up
Quality
This is a single-arm observational study without a comparison group or randomization, so it cannot reliably show whether chemical ablation is better than surgery or watchful waiting.
Limitations
No control/comparator group; single-arm prospective design; wide range in follow-up time (7-64 months)
Taken word for word from the abstract
- population Adult patients with symptomatic perianal fistula were prospectively included in the study.
- intervention The fistula tract was irrigated with a 5% silver nitrate solution.
- primaryOutcome The primary outcome measured in this study was the rate of clinical healing after long-term follow-up.
- result After irrigation with silver nitrate, 82 (44%) patients had complete clinical healing during a median follow-up time of 50 (7-64) months.
- result Patients with intermittent discharge had a significantly higher rate of complete clinical healing than those with continuous discharge (P < .04).
- result Fistulas without abscesses or secondary tracts had a significantly higher rate of complete clinical healing than the other types (P = .007).
- n A total of 186 patients with anal fistula were analysed.
- followUp median follow-up time of 50 (7-64) months
Surg Innov · PMID 33787391 · Read it on PubMed ↗
Iqbal et al. 2019
Outcome Of Use Of 1% Silver Nitrate In Patients With Low Lying Perianal Fistula
Most healed without surgery using silver nitrate.Prospective cohortLow quality
79 people10 weeks
58 of 76 patients (76.3%) achieved complete clinical healing without surgery, while 18 (23.68%) failed to heal
Who was studied
adults with low-lying perianal fistula with pain and discharge
What they received
non-surgical irrigation of the fistula tract with 1% silver nitrate solution
Main outcome
complete stopping of fistula symptoms for 10 weeks in a row
Quality
This was a single group of patients with no comparison group and no randomization, so it cannot show whether silver nitrate worked better than doing nothing or than surgery.
Limitations
No control or comparison group, not randomized, only low-lying fistulas included, and 3 of 79 patients were lost to follow-up.
Taken word for word from the abstract
- n Seventy-nine patients presenting to the outpatient department of Ward 3, Surgical unit 1 in Jinnah Postgraduate Medical Centre during a period of 8 months from April to November 2017 with complain of perianal pain and pussy discharge were included in the study.
- population with complain of perianal pain and pussy discharge were included in the study
- population patients with low lying perianal fistula
- intervention irrigation of the fistula tract with 1% of silver nitrate solution
- primaryOutcome Outcome measure were cessation of the symptoms for consecutive 10 weeks.
- result Out of 76 patients, 58 (76.3%) patients showed complete clinical healing while 18 (23.68%) of patients showed failure to clinical healing.
- followUp cessation of the symptoms for consecutive 10 weeks
J Ayub Med Coll Abbottabad · PMID 31535505 · Read it on PubMed ↗
Pérez Lara et al. 2019
Can Perianal Fistula Be Treated Non-surgically with Platelet-Rich Fibrin Sealant?
Non-surgical plug worked about as well as basic surgery.RetrospectiveLow quality
size not given2019
No significant differences in complications or continence between the three groups; healing success was significantly better with one surgical technique (graduated curette set) than with the other two, and the non-surgical outpatient method gave results similar to the basic surgical technique.
Who was studied
adults with anal fistula, some with a previous seton in place
What they received
platelet-rich fibrin plug inserted in outpatient clinic without anaesthesia, without curettage, and without closing the internal opening
Compared with
surgical insertion of the plug under anaesthesia, with curettage of the fistula tract and closure of the internal opening (two surgical techniques)
Main outcome
fistula healing outcome, complication rate, and continence after treatment
Quality
This is a small, non-randomised comparison of three groups treated over time at one hospital with no patient numbers given, so the findings are not strong evidence.
Limitations
No randomisation described, no participant numbers reported, single-centre study, and outcome details (e.g., cure rates, follow-up length) are not quantified in the abstract.
Taken word for word from the abstract
- population The patients in the three groups were homogeneous in terms of sex, age, ASA classification, location of the fistula and previous insertion of the seton.
- intervention for those in group C, the plug was inserted during outpatient consultation, without anaesthesia, without curettage and without closure of the internal orifice
- comparator for the patients in group A, the plug was surgically inserted, under anaesthesia, and traditional methods were used to curette the fistula tract and close the internal orifice
- primaryOutcome There were no significant differences in morbidity or postoperative continence.
- result there was a statistically significant difference in the outcomes achieved, in favour of group B, while groups A and C obtained similar results
J Gastrointest Surg · PMID 30187327 · Read it on PubMed ↗
Pu et al. 2012
Fistula plug versus conventional surgical treatment for anal fistulas. A system review and meta-analysis
Fistula plug less effective than surgery.Meta-analysisLow qualityRelated question
428 people2012
recurrence was more common after plug treatment than after conventional surgery (62.1% vs 47%), with no significant difference in incontinence rates
Who was studied
adults with anal fistula
What they received
anal fistula plug (a minimally invasive device)
Compared with
conventional surgical treatment for anal fistula
Main outcome
recurrence of fistula and fecal incontinence
Quality
it pools only two randomized trials with three retrospective studies, a small and mixed evidence base that limits confidence in the pooled estimate
Limitations
combines different study designs (RCTs and retrospective studies), does not separate Crohn's-related fistulas, and compares a specific device (plug) rather than broader conservative or watchful approaches to surgery
Taken word for word from the abstract
- n A total of 428 patients were included in our study.
- result The recurrence rate was higher in those patients who accept fistula plug treatment (62.1% versus 47%) (p=0.004).
- primaryOutcome To evaluate the recurrence and fecal incontinence of anal fistula plug versus conventional surgical treatment for anal fistulas.
- intervention anal fistula plug
- comparator conventional surgical treatment
- population anal fistulas
Saudi Med J · PMID 22964807 · Read it on PubMed ↗
Borda Mederos et al. 2011
[Experience with a biological plug for biological in complex anal fistula]
Plug healed most fistulas without surgery.RetrospectiveLow quality
46 people29.8 months
fistula healed in 73.9% of patients, with no incontinence reported
Who was studied
adults with complex anal fistula, mostly recurrent fistulas after previous surgery
What they received
biological fistula plug (Surgisis AFP) placed without surgery
Compared with
none (single-group review, no direct comparison)
Main outcome
fistula closure (successful healing) rate
Quality
This was a retrospective case series without a comparison group, so it cannot reliably show how the plug compares with surgery or no treatment.
Limitations
Retrospective design, no control group, most patients had already failed prior surgery, small sample of 46 patients from a single center.
Taken word for word from the abstract
- n We retrospectively reviewed the results of 46 patients with complex anorectal fistula treated with the biological plug over a period of 4 years.
- population 41 were recurrent fistulas (89.1%) and 5 high transsphincteric fistulas (10.8%)
- intervention The biologic plug Surgisis® AFP it's being used since 2006 and produces the closure of the fistula in approximately 12 weeks, without surgery
- comparator We retrospectively reviewed the results of 46 patients with complex anorectal fistula treated with the biological plug
- primaryOutcome The anal fistula plug was successful in 73.9% of cases
- result The anal fistula plug was successful in 73.9% of cases with a median follow-up 29.8 months.
- followUp median follow-up 29.8 months
Rev Gastroenterol Peru · PMID 22476123 · Read it on PubMed ↗
Misra et al. 1988
A new non-operative approach to fistula in ano
Low recurrence, no incontinence with wire technique.Case seriesLow quality
56 people1988
Only 2 of 56 patients had recurrence, and none experienced temporary or permanent incontinence
Who was studied
Adults with low and high horseshoe anal fistulas
What they received
A non-operative outpatient technique using a multi-strand stainless steel wire passed through the fistula tract
Main outcome
Fistula recurrence and incontinence of flatus or faeces
Quality
This is a small, uncontrolled case series without a comparison group, so it cannot show how this approach compares to surgery.
Limitations
No comparator group, no stated follow-up duration, and no exclusion of Crohn's disease is mentioned.
Taken word for word from the abstract
- population used in 56 patients with low fistulae as well as high horseshoe anal fistulae
- intervention The technique involved passing a multi-strand stainless steel wire through the fistulous tract
- primaryOutcome Recurrence was seen in only 2 patients and none of the patients experienced temporary or permanent incontinence of flatus or faeces.
- result Recurrence was seen in only 2 patients and none of the patients experienced temporary or permanent incontinence of flatus or faeces.
- n has been used in 56 patients
Br J Surg · PMID 3208042 · Read it on PubMed ↗

What actually helps, on this site

Treatments Dr. Kamrava performs for this:

Fistulotomy

More about the condition:

All 16 studiesEvery study that answered the question, with its design, size and result.

The other 10 studiesEverything else the search returned, including anything retracted.

Alam et al. 2025
Does antibiotic therapy for anal abscess reduce the risk of fistula surgery? A retrospective study
Many healed without fistula surgeryRetrospectiveVery low qualityRelated question
109 peopleapproximately 30 months
41% of patients treated with incision alone had no recurrence during follow-up, and not getting antibiotics after incision was linked to a higher chance of recurrence (antibiotic use associated with OR 0.44)
Who was studied
adults with a first-time perianal abscess, some later found to have an obvious fistula
What they received
incision of the abscess alone (no definitive fistula surgery), with or without antibiotics afterward
Compared with
fistula surgery performed for patients with an evident fistula
Main outcome
the rate of patients who later needed fistula surgery and/or had the abscess come back
Quality
It is a small retrospective chart review without randomization or adjustment for confounders, so the antibiotic and recurrence findings could easily be due to other differences between patients.
Limitations
Retrospective design, no multivariate analysis due to insufficient data, and the study is about first-time abscesses (not confirmed chronic fistula-in-ano), with patients who had an obvious fistula routed straight to surgery rather than followed conservatively.
Taken word for word from the abstract
- n Among 109 patients (mean age 43 ± 13 years; 74 % male)
- population all patients presenting in 2019 with a first perianal abscess treated by incision under local anesthesia
- intervention 55 had incision alone
- comparator 54 underwent fistula surgery
- primaryOutcome The primary outcome was the rate of patients requiring fistula surgery and/or experiencing abscess recurrence
- result This study demonstrates that 41 % of patients who underwent incision for a first perianal abscess did not experience recurrence during the follow-up period.
- result the administration of antibiotic therapy post-incision was associated with a reduced likelihood of recurrence
- followUp The mean follow-up for patients with incision alone was approximately 30 months
Clin Res Hepatol Gastroenterol · PMID 41047078 · Read it on PubMed ↗
Curtis et al. 2025
Fistulae Secondary to Vaginal Pessary Use for Pelvic Organ Prolapse: A Systematic Review
Not about anal fistula-in-ano; pessary-related fistulae sometimes healed without surgery.Systematic reviewLow qualityRelated question
76 people2025
Conservative management led to size reduction or complete healing in 69% of fistulae; surgical repairs were also mostly successful (88% vaginal and 100% abdominal vesicovaginal repairs)
Who was studied
Women who developed urogenital or rectovaginal fistulae from using a vaginal pessary for pelvic organ prolapse
What they received
Conservative (non-surgical) management of the fistula
Compared with
Surgical repair of the fistula
Main outcome
Whether the fistula got smaller or healed
Quality
Mostly made up of individual case reports and small case series with only two retrospective studies, so the findings are not strong evidence.
Limitations
Based mainly on case reports/series with high risk of bias tools applied, not on fistula-in-ano patients, and does not address Crohn's-related exclusion.
Taken word for word from the abstract
- population Urogenital and rectovaginal fistulae are rare complications of pessary use for pelvic organ prolapse (POP).
- n describing 76 fistulae (34 urogenital, 42 rectovaginal)
- intervention Conservative management resulted in size reduction or resolution in 69% of fistulae: this approach should be considered.
- comparator Vaginal (88%) and abdominal (100%) vesicovaginal fistula repairs were successful.
- primaryOutcome Conservative management resulted in size reduction or resolution in 69% of fistulae
- result Conservative management resulted in size reduction or resolution in 69% of fistulae: this approach should be considered.
Int Urogynecol J · PMID 39833536 · Read it on PubMed ↗
Emile et al. 2016
A systematic review of the management of anal fistula in infants
In infants, many healed without surgerySystematic reviewLow qualityRelated question
490 people2016
About 20% of infants were treated conservatively first, and 73% of those achieved complete resolution without surgery; surgery was performed in 86% of infants overall, with fistulotomy having a higher recurrence rate (6.6%) than fistulectomy (1.1%)
Who was studied
infants under 2 years old (mostly under 1 year) with anal fistula
What they received
conservative (non-surgical) treatment of the fistula
Compared with
surgical treatment (fistulotomy or fistulectomy)
Main outcome
whether the fistula healed completely and whether it came back
Quality
This is a review pooling results from 14 mostly small, non-randomized studies in infants, with no control over which patients received conservative treatment, so the comparison is not reliable.
Limitations
Studies were heterogeneous, mostly retrospective case series, with selection of treatment not randomized or controlled; population is infants, not adults.
Taken word for word from the abstract
- population FIA in infants less than 2 years old
- n total of 490 infants
- intervention Around 20 % of patients with FIA underwent conservative treatment initially, and 73 % of them achieved complete resolution.
- comparator Surgery was performed on 86 % of the infants.
- primaryOutcome Variables analyzed comprised patient characteristics, type of FIA, methods of treatment, recurrence, and postoperative complications.
- result Fistulotomy accounted for 65 % of the procedures performed and was associated with a higher recurrence rate than fistulectomy (6.6 vs. 1.1 %, respectively).
Tech Coloproctol · PMID 27663698 · Read it on PubMed ↗
Morcos et al. 2013
Contemporary management of perianal conditions in febrile neutropenic patients
Most infections healed without surgery.RetrospectiveLow qualityRelated question
101 people2013
Most perianal problems (about three quarters) were not infected and were treated without surgery; among the 26 patients with infected perianal conditions (including only 4 with a fistula), surgery was done mainly to drain a collection or remove dead tissue, while those without a collection were treated without surgery; only 1 of the 26 died
Who was studied
Adult patients with fever and low white blood cell counts (neutropenia) who had perianal problems, including a few with anal fistula
Main outcome
How perianal conditions, including fistulas, were managed and what happened to patients
Quality
This is a retrospective chart review in cancer patients with weakened immune systems, and only 4 of the 101 perianal cases were actually fistulas, so it tells us very little specifically about whether fistula-in-ano can heal without surgery.
Limitations
Retrospective design, very small number of fistula patients (4), population is immunocompromised febrile neutropenic patients rather than general adults with fistula-in-ano, and conditions (abscess, fistula, inflammation, necrotizing fasciitis) are grouped together.
Taken word for word from the abstract
- population Medical records of all adult febrile neutropenic patients (933 patients) who were admitted during the period from January, 2009 to December 2011 were retrospectively review. All patients with perianal complaints or conditions were included.
- n Of all the reviewed charts, 101 (10.8%) had perianal complaints or conditions.
- primaryOutcome The clinical features, management and outcome of septic conditions were recorded.
- result Most of them were non septic (74.3%), like piles and fissures, and were treated conservatively. In 26 patients the diagnosis was a septic condition: abscess (12 patients), fistula (4), inflammation (9) and necrotizing fasciitis (1).
- result Surgery was done in 13 patients to drain a collection and in 2 patients to debride necrotic tissue. Most patients who had no collection had conservative management. There was 1 fatality only (3.8%) in those 26 patients.
Eur J Surg Oncol · PMID 23347777 · Read it on PubMed ↗
Heitland 2012
[Perianal fistula and anal fissure]
Fistulas don't heal without treatmentNarrative reviewLow quality
size not given2012
the abstract states that perianal fistulas will not heal on their own; treatment options range from surgery to conservative approaches like fibrin glue or a plug
Who was studied
adults with anal fistula caused by gland infection (cryptoglandular fistula)
Main outcome
whether the fistula heals and whether treatment causes incontinence
Quality
this is a narrative review summarizing general treatment approaches without presenting original study data or evidence on healing rates
Limitations
no data, patient numbers, or outcome comparisons are given; it is an opinion-based overview of treatment philosophy
Taken word for word from the abstract
- population Perianal abscesses are caused by cryptoglandular infections.
- result perianal fistulas will not heal on their own
- result The therapy of a fistula is oriented between a more aggressive approach (operation) and a conservative treatment with fibrin glue or a plug.
- primaryOutcome Definitive healing and the development of incontinence are the most important key points.
Chirurg · PMID 23179514 · Read it on PubMed ↗
Abcarian 2011
Anorectal infection: abscess-fistula
Surgery usually needed; conservative options recur more.Narrative reviewLow quality
size not given2011
The abstract states that treatment of a fistula is surgical in all cases, and that trading radical surgery for conservative, non-sphincter-cutting procedures results in more recurrence or persistence requiring repeated operations in many cases.
Who was studied
Adults with anorectal fistula (fistula-in-ano)
What they received
Non-surgical or sphincter-sparing conservative treatments (draining seton, fibrin sealant, anal fistula plug, flap procedures, LIFT)
Compared with
Standard surgical treatment involving fistulotomy or sphincter-cutting procedures
Main outcome
Whether the fistula heals and does not come back, versus damage to bowel control
Quality
This is a narrative review summarizing general clinical experience and prior literature rather than a new controlled study, so it carries less weight as direct evidence.
Limitations
No original data, sample size, or specific study results are given; it is an expert overview rather than a controlled trial or cohort study.
Taken word for word from the abstract
- population Anorectal abscess and fistula are among the most common diseases encountered in adults.
- intervention conservative (nonsphincter cutting) procedures such as a draining seton, fibrin sealant, anal fistula plug, endorectal advancement flap, dermal island flap, anoplasty, and LIFT (ligation of intersphincteric fistula tract) procedure
- comparator The treatment of a fistula, although surgical in all cases, is more complex due to the possibility of fecal incontinence as a result of sphincterotomy.
- primaryOutcome so even though the aim of a surgical procedure is to cure a fistula, conservative management short of major sphincterotomy is warranted to preserve fecal incontinence
- result However, trading radical surgery for conservative (nonsphincter cutting) procedures such as a draining seton, fibrin sealant, anal fistula plug, endorectal advancement flap, dermal island flap, anoplasty, and LIFT (ligation of intersphincteric fistula tract) procedure all result in more recurrence/persistence requiring repeated operations in many cases.
Clin Colon Rectal Surg · PMID 22379401 · Read it on PubMed ↗
de Parades et al. 2010
Seton drainage and fibrin glue injection for complex anal fistulas
Half cured without major surgery.Case seriesLow qualityRelated question
30 people11.7 (range, 0.2-33.5) months
15 of 30 patients (50%) were cured at the end of follow-up, though 2 developed a delayed abscess after initial closure
Who was studied
Adults with complex anal fistula (some with Crohn's disease)
What they received
Seton drainage for 8 weeks followed by fibrin glue injection (non-surgical)
Main outcome
Complete closure of the fistula (cure) at end of follow-up
Quality
Single-arm case series with no comparison group, mixed population including Crohn's patients, and a wide range of follow-up times, so it cannot reliably show whether non-surgical treatment works better or worse than other options.
Limitations
No control group, small sample size, mixed population (including Crohn's disease patients), variable follow-up duration (0.2 to 33.5 months).
Taken word for word from the abstract
- population Thirty consecutive patients with a complex anal fistula underwent glue instillation after an 8 week period of seton drainage.
- intervention glue instillation after an 8 week period of seton drainage
- primaryOutcome Cure was defined as complete closure of any secondary opening, absence of fistula seepage, and no abscess formation.
- result At the end of follow-up, 15 (50%) patients were considered to have been cured.
- result Complete closure of the fistula was achieved in 17 patients at 1 month but in two patients a delayed abscess occurred.
- n Thirty consecutive patients with a complex anal fistula underwent glue instillation
- followUp The mean duration of follow-up was 11.7 (range, 0.2-33.5) months.
Colorectal Dis · PMID 19210300 · Read it on PubMed ↗
Basilico et al. 2006
[Anastomotic fistulas after colorectal resection for carcinoma: incidence and treatment in our recent experience]
Some leaks healed without surgery.RetrospectiveLow qualityRelated question
25 people2006
9 of 25 leaks (36%) closed on their own with conservative treatment, while 16 of 25 (64%) required reoperation
Who was studied
adults with colorectal cancer who developed a leak at the surgical bowel joint after cancer surgery (not anal fistula-in-ano)
What they received
conservative, non-surgical treatment of the leak
Compared with
reoperation (surgical repair) of the leak
Main outcome
whether the anastomotic leak healed on its own or needed further surgery
Quality
this is a small single-centre retrospective series about a different condition (post-surgical bowel leaks, not anal fistula-in-ano), with no control group and high death rate among reoperated patients.
Limitations
Retrospective single-hospital series of colorectal cancer surgery patients with anastomotic leaks, not anal fistula-in-ano; small numbers; reoperated patients had a 25% postoperative death rate.
Taken word for word from the abstract
- n Twenty-five out of 373 anastomotic leaks developed (6.7%)
- population 448 patients affected with colorectal cancer were operated on
- intervention the fistulas spontaneously closed with conservative treatment
- comparator reoperation was necessary
- primaryOutcome In 9 cases (36%), the fistulas spontaneously closed with conservative treatment, while in 16 (64%) reoperation was necessary.
- result In 9 cases (36%), the fistulas spontaneously closed with conservative treatment, while in 16 (64%) reoperation was necessary.
Minerva Chir · PMID 17159744 · Read it on PubMed ↗
Lassen et al. 1996
Conservative management of rectocutaneous fistula following radical perineal prostatectomy
All 3 healed without surgery.Case seriesVery low qualityRelated question
3 people1996
all 3 fistulas healed without needing surgery
Who was studied
men who developed a rectocutaneous fistula after radical perineal prostatectomy for prostate cancer
What they received
conservative management: wound care, antibiotics, bowel rest, parenteral nutrition, and in one case urinary diversion and bed rest
Compared with
traditional approach of diverting colostomy until fistula closure
Main outcome
whether the fistula healed
Quality
this is a report of only 3 patients with no comparison group, so it cannot reliably show how often this approach works.
Limitations
very small number of cases, no control group, and the fistulas were caused by surgical injury during prostate removal rather than the usual cryptoglandular anal fistula-in-ano.
Taken word for word from the abstract
- n We report 3 cases of rectocutaneous fistula following radical perineal prostatectomy
- population rectocutaneous fistula following radical perineal prostatectomy
- intervention This included appropriate wound care, antibiotics, bowel rest, parenteral hyperalimentation, and, in the presence of a concomitant urine leak in 1 case, optimal urinary diversion and bed rest.
- comparator This has traditionally been managed with diverting colostomy until closure of the fistula is assured.
- primaryOutcome All fistulas healed without incident.
- result All fistulas healed without incident.
Urology · PMID 8638376 · Read it on PubMed ↗
Goldstein 1987
Anal fissures and fistulas
Says chronic fistulas need surgeryNarrative reviewVery low qualityRelated question
size not given1987
States that chronic fistula in ano requires fistulotomy (surgery); only acute fissures are described as healing with conservative management
Who was studied
Adults with anal fissures and fistulas
Main outcome
Healing or resolution of fistulas
Quality
This is an older narrative review with no study data, patient numbers, or formal evidence, just general clinical statements.
Limitations
No original data, no methodology, no patient outcomes reported; general teaching statements only, and conflates fissures and fistulas.
Taken word for word from the abstract
- population Thorough understanding of the pathophysiology of anal fissures and fistulas is essential for the physician treating these conditions.
- result Chronic fistula in ano requires fistulotomy, which can be done with a local anesthetic.
- primaryOutcome Chronic fistula in ano requires fistulotomy, which can be done with a local anesthetic.
Postgrad Med · PMID 3671218 · Read it on PubMed ↗

How we searchedThe exact query, the date it ran, and what came back — so you can run it yourself.

Searched: PubMed · ClinicalTrials.gov · Crossref on 2026-10-24
The exact search — paste this into PubMed to repeat it: ("Rectal Fistula"[Mesh] OR "anal fistula"[tiab] OR "fistula-in-ano"[tiab] OR "fistula in ano"[tiab]) AND ("conservative treatment"[tiab] OR "conservative management"[tiab] OR "nonoperative"[tiab] OR "non-surgical"[tiab] OR "without surgery"[tiab] OR "medical management"[tiab] OR "antibiotic therapy"[tiab] OR "watchful waiting"[tiab]) AND ("healing"[tiab] OR "closure"[tiab] OR "recurrence"[tiab] OR "outcome"[tiab]); PubMed expanded that to: ("Rectal Fistula"[MeSH Terms] OR "anal fistula"[Title/Abstract] OR "fistula-in-ano"[Title/Abstract] OR "fistula-in-ano"[Title/Abstract]) AND ("conservative treatment"[Title/Abstract] OR "conservative management"[Title/Abstract] OR "nonoperative"[Title/Abstract] OR "non-surgical"[Title/Abstract] OR "without surgery"[Title/Abstract] OR "medical management"[Title/Abstract] OR "antibiotic therapy"[Title/Abstract] OR "watchful waiting"[Title/Abstract]) AND ("healing"[Title/Abstract] OR "closure"[Title/Abstract] OR "recurrence"[Title/Abstract] OR "outcome"[Title/Abstract])
What came back: 114 records found · 114 read · 16 answered the question
Included: Human, animal or laboratory studies reporting an outcome relevant to the question
Excluded: Records about a different condition or intervention
Records reporting no outcome
Retracted publications, which are listed but excluded from every count
Limits: Details were read from abstracts, not full papers, so anything reported only in a paper's methods section is not captured here.
Fields were read from abstracts, not full text, so detail reported only in a paper's methods section is not captured.
Evidence strength is adapted from the GRADE framework. It is not a GRADE assessment and was not produced by a GRADE panel.

114records came back from the search
114were read
16actually answered the question

Risks and safetyReported side effects and who should be careful.

Chemical ablation and plug procedures were not reported to cause fecal incontinence in these studies, but the numbers of people studied were small.
Seton drainage combined with fibrin glue led to a delayed abscess in 2 of 30 patients after the fistula appeared to have healed.
A fistula plug was linked to a higher recurrence rate than conventional surgery in one review (62% vs 47%), meaning symptoms or the fistula itself came back more often.

Why people askWhat brings people to this question.

Fear of surgery, anaesthesia, or a hospital stay
Worry about bowel control problems from cutting the sphincter muscle during surgery
Hope for a quicker, less invasive outpatient option
A previous surgery failed or the fistula came back, prompting a search for an alternative

Common questionsShort answers, drawn from the same studies.

Can an anal fistula heal without surgery?: In four small studies, non-surgical treatments such as silver nitrate, biologic plugs, and wire drainage closed the fistula in somewhere between 44% and 76% of people. None of these were randomized trials, so it isn't clear how reliably these results would hold up compared with surgery in a fair, head-to-head test.
Is surgery always needed for an anal fistula?: Some narrative reviews say chronic fistula-in-ano always needs surgery, but these are opinion pieces without original data behind them. Observational studies show some fistulas do close with non-surgical treatment, though the evidence is limited and not based on trials.
Do antibiotics alone cure a fistula?: One retrospective study of first-time abscesses found antibiotics after drainage were linked to lower rates of later fistula surgery, but this was studied in people with abscesses, not confirmed chronic fistulas, so it doesn't directly answer whether antibiotics cure an existing fistula.
Should I stop non-surgical treatment if it isn't working?: These studies show non-surgical treatments fail to close the fistula in a meaningful share of people — for example, under half with chemical ablation in one study. If discharge, pain, or swelling continues, it's reasonable to see a colorectal surgeon about other options.
Is a fistula plug better than surgery?: One review found fistula plugs had a higher recurrence rate than conventional surgery (62% vs 47%), with no difference in incontinence between the two. This suggests surgery closed fistulas more reliably in that comparison, though it wasn't a randomized trial.

What has changedEvery re-check, and whether it changed the answer.

2026-10-24
Re-reviewed under a revised method. 64 no longer retrieved · evidence strength very low → low · conclusion signal of harm → not applicable.
How certain we are changed. The conclusion changed.

This is information, not advice

This page summarises published research. It cannot tell you what is happening in your own body, and evidence changes. If something is bleeding, painful, or new, it is worth being looked at — that is a different question from the one on this page, and a better one to bring to a consultation.

Contact the office

Automated evidence review — PubMed, ClinicalTrials.gov, Crossref. Search strategy, grading rules and the checks that must pass before anything publishes were written by Allen Kamrava, MD, MBA, FACS, FASCRS, colon & rectal surgery, Beverly Hills. The pages themselves are compiled by software running that method and are not read one by one before publication — saying otherwise would be the one claim here that could not be checked.

Allen Kamrava, MD, MBA, FACS, FASCRS · 435 N. Bedford Dr., Suite 308, Beverly Hills, CA 90210 · 424.279.8222

Educational information — not medical advice.