Symptoms 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 often follows a cycle of pain, swelling and drainage rather than one continuous symptom. A small skin opening may repeatedly discharge after an abscess seems to have settled.

    The Symptom Pattern Is Often Cyclical

    Persistent or throbbing anal pain: Pain may be worse while sitting, moving, coughing or passing stool.

    Discharge near the anus: Pus, fluid, or foul-smelling discharge may come from a small opening in the skin.

    Recurrent swelling: The area can repeatedly swell and then drain, especially if an abscess forms again.

    Redness or skin irritation: Ongoing moisture and discharge may irritate the surrounding skin.

    Blood or pus with bowel movements: Some people notice blood or pus when they pass stool.

    Fever with an abscess: Fever, chills, or feeling unwell may occur when active infection is present.

    The Pattern Matters More Than One Isolated Symptom

    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.

    The same condition may be mild in one person and much more disruptive in another. Age, disease stage, other health problems, and medicines can all change the presentation. Some conditions can also remain silent for a period, so absence of dramatic symptoms does not always mean there is no health risk.

    If symptoms are new, persistent or progressively worsening, a healthcare professional may need history, examination, blood tests, imaging or other investigations to distinguish anal fistula from conditions that look similar.

    What Details Make The Symptom Pattern More Meaningful

    When symptoms are being assessed, details such as previous abscesses, drainage, fever, bowel disease and any prior surgery around the anus often matter as much as the symptom name itself.

    •  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?

    Could It Be Something Else?

    Haemorrhoids, fissures, abscesses and hidradenitis can cause overlapping local symptoms. This is why a symptom checklist can guide a consultation but should not be used as a self-diagnosis tool.

    How An Ayurvedic Clinician May Read The Symptom Pattern

    In Ayurveda, the quality, timing, location and combination of symptoms are considered together. The clinician may also consider constitution, digestion, aggravating factors and the relevant Dosha/Dhatu/Srotas framework where it is clinically appropriate.

    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.

    This language can add useful context during an Ayurvedic consultation, but it should not be used to bypass modern diagnostic criteria or investigations when they are indicated.

    Important distinction
    Ayurvedic terminology can describe a clinical pattern, but it should not be used to bypass investigations or to imply that every modern diagnosis has one exact Ayurvedic equivalent.

    Symptoms That Should Not Be Ignored

    Seek prompt or urgent medical care for:

    •  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

    For sudden, severe or rapidly worsening symptoms, emergency assessment is safer than waiting for a routine consultation.

    What You Should Remember

    One symptom alone rarely confirms anal fistula. More useful clues are the pattern of persistent or throbbing anal pain, discharge near the anus, recurrent swelling, how long they have been present, and whether they are getting worse. Ayurvedic terminology can help describe the individual's presentation, while appropriate examination and investigations are what confirm or rule out important medical causes.

    For anal fistula, look for a pattern: what is new, what is persistent, what is worsening, and what is occurring together. That pattern is more clinically useful than matching yourself to a single symptom on a list.

    Clinical Review & Sources

    Medical source(s): Anal fistula - NHS

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

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