Causes of Anal Fistula

category-icon Published on 20 Sep, 2026 category-icon Updated on 20 Sep, 2026
Information By Dr. VD Aggarwal    Medically Reviewed by Dr. Partap Chauhan

    An anal fistula usually has a clear starting point: infection and an abscess near the anus. Once a tract forms, the problem becomes more than ordinary irritation or “piles,” which is why identifying the cause matters.

    The Common Pathway Behind The Condition

    An anal fistula is an abnormal tunnel between the anal canal and the skin near the anus. It most often follows an anorectal abscess or infection.

    A cause, a risk factor, and a trigger are not the same thing. A cause is part of the disease process; a risk factor makes the condition more likely; a trigger may simply make an existing problem more noticeable. Keeping those ideas separate makes health content more accurate and more useful for patients.

    Factors That Can Increase Risk Or Contribute

    Previous anal abscess

    The most common pathway is an infected anal gland that forms an abscess; after drainage, a persistent channel may remain.

    Crohn’s disease

    Chronic intestinal inflammation can increase the risk of perianal abscesses and fistulas.

    Other inflammatory or infectious conditions

    Less commonly, specific infections or inflammatory disorders can damage tissue around the anus.

    Previous surgery or injury

    Trauma or procedures in the anal or perineal region can occasionally contribute to fistula formation.

    Recurrent local infection

    Repeated abscess formation around the anus may create or maintain a fistulous tract.

    Cause, Risk Factor Or Trigger — They Are Not The Same

    Poor hygiene alone is not considered the usual cause of an anal fistula. A fistula should be assessed because it often does not close permanently without appropriate medical or surgical management.

    If a factor repeatedly seems to worsen symptoms, note the pattern and discuss it during consultation. But avoid removing multiple foods, stopping medicines or assuming a diagnosis only from that observation.

    What Makes The Cause Clearer In A Real Consultation

    For anal fistula, a useful consultation is not just “What did you eat?” or “When did it start?” The pattern becomes clearer when the clinician knows about previous abscesses, drainage, fever, bowel disease and any prior surgery around the anus.

    •         Has there been swelling, pus, bleeding or a previous abscess?
    •         Does pain change with bowel movements or sitting?
    •         Is there fever, inflammatory bowel disease, diabetes or reduced immunity?

    Why this matters
    Haemorrhoids, fissures, abscesses and hidradenitis can cause overlapping local symptoms. The aim is to identify the underlying problem rather than attach every similar symptom to one diagnosis.

    How Ayurveda May Interpret The Pattern

    Ayurveda approaches the same patient through its own diagnostic language. The purpose is not to rename a modern diagnosis, but to understand the person’s pattern, aggravating factors and functional imbalance before planning care.

    Classical Ayurveda describes Bhagandara as a fistulous disorder around the anorectal region. Ayurvedic assessment may consider Apana Vata, local tissue involvement and wound characteristics, but modern imaging and surgical assessment remain important for defining the tract.

    A responsible Ayurvedic assessment also considers Nidana (aggravating factors), Prakriti, the strength of Agni where relevant, and the actual tissues or channels involved. One modern disease name should not automatically be mapped to one classical term in every patient.

    When Not To Self-Manage

    Do not rely only on self-care or an online explanation if there is:

    •         Fever with increasing anal pain or swelling
    •         Rapidly spreading redness
    •         Difficulty passing stool or urine because of severe pain/swelling
    •         Significant bleeding
    •         Symptoms in someone with Crohn’s disease, diabetes or reduced immunity

    These features do not always mean a serious complication is present, but they are reasons for timely clinical assessment.

    What You Should Remember

    For Anal Fistula, the key is to identify the underlying process, not just the last thing that seemed to bring on symptoms. Poor hygiene alone is not considered the usual cause of an anal fistula. A fistula should be assessed because it often does not close permanently without appropriate medical or surgical management. An Ayurvedic interpretation can add an individualised view of Nidana, Dosha, Dhatu or Srotas, but it should sit alongside a clear medical diagnosis rather than replace it.

    The strongest version of this page should help a reader understand why anal fistula can happen, what merely increases risk, and what should prompt a proper diagnosis. That distinction is more useful than a long list of “causes.”

    Sources

    Medical source(s): Anal fistula - NHS

    Ayurveda source: https://namaste.ayush.gov.in/

    Consult Experienced Ayurveda Doctors for fistula

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