Painful Drainage? Why Your Anal Fistula Won't Heal & Medical Next Steps

If you're dealing with persistent drainage, discomfort, or recurring infections near the anus, you may be facing an anal fistula. Many people expect it to heal on its own. Unfortunately, most anal fistulas do not resolve without medical treatment.

Understanding why your anal fistula isn't healing — and what you can do next — can help you move forward with clarity and confidence.

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What Is an Anal Fistula?

An anal fistula is an abnormal tunnel that forms between the inside of the anal canal and the skin around the anus. It usually develops after an anal abscess, which is an infected gland near the anus.

When an abscess drains (on its own or surgically), a small channel may remain. If that tunnel does not close properly, it becomes a chronic anal fistula.

Common Symptoms of an Anal Fistula

• Persistent drainage of pus or fluid
• Irritation or redness around the anus
• Pain that may worsen when sitting or during bowel movements
• Recurrent swelling or abscesses
• Occasional bleeding
• Foul-smelling discharge

If these symptoms sound familiar, you can check your symptoms using Ubie's free AI-powered Anal Fistula symptom checker to get personalized guidance in just 3 minutes before your doctor's appointment.

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Why Your Anal Fistula Won't Heal on Its Own

It's natural to hope the drainage will stop and the area will close up. However, there are clear medical reasons why most anal fistulas persist.

1. The Tunnel Remains Open Internally

An anal fistula connects two surfaces — the inside of the anal canal and the outer skin. Even if the outside seems to improve, the internal opening often stays open. As long as bacteria from stool can enter the tunnel, healing is unlikely.

2. Ongoing Infection

Bacteria inside the fistula tract prevent closure. Even if the pain decreases, low-grade infection may continue silently.

3. Chronic Inflammation

Conditions such as Crohn's disease or other inflammatory bowel diseases increase the risk of persistent anal fistulas. In these cases, inflammation interferes with normal healing.

4. Scar Tissue Formation

Repeated infections and drainage can create scar tissue. Scar tissue has poor blood supply, making it harder for the body to repair itself.

5. Abscess Recurrence

If part of the fistula becomes blocked, fluid can build up again, leading to another abscess. This cycle often repeats without medical treatment.

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Can an Anal Fistula Ever Heal Without Surgery?

In rare cases, very superficial fistulas may close with conservative management. However, most anal fistulas require medical or surgical treatment.

Non-surgical management may include:

• Warm sitz baths
• Antibiotics (if infection is present)
• Careful hygiene
• Pain management

While these approaches can ease symptoms, they usually do not eliminate the fistula tunnel itself.

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When to See a Doctor

You should speak to a doctor if you experience:

• Ongoing drainage lasting more than a few weeks
• Recurrent anal abscesses
• Increasing pain or swelling
• Fever or chills
• New bowel control issues

Fever, severe pain, spreading redness, or feeling generally unwell can signal a serious infection. In those cases, seek urgent medical care.

Even if symptoms feel manageable, a persistent anal fistula should be evaluated by a healthcare professional — typically a colorectal surgeon.

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How Doctors Diagnose an Anal Fistula

Diagnosis usually involves:

• A physical exam of the anal area
• Gentle probing of the external opening
• Imaging studies such as MRI (for complex cases)
• Occasionally an exam under anesthesia

Imaging is especially helpful if the fistula is complex or involves deeper muscles.

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Medical Treatment Options for Anal Fistula

The goal of treatment is to:

• Remove the fistula tract
• Prevent recurrence
• Protect bowel control

Treatment depends on the type and location of the anal fistula.

1. Fistulotomy

This is the most common treatment for simple anal fistulas. The surgeon opens the entire tunnel so it can heal flat from the inside out.

• High success rate
• Usually outpatient surgery
• Healing time: several weeks

2. Seton Placement

A seton (a thin surgical thread) may be placed in the fistula tract.

• Keeps the tract open to drain
• Reduces infection risk
• Often used in complex fistulas
• May be temporary or long-term

3. Advancement Flap Procedure

In this technique, the internal opening is covered with a flap of healthy tissue.

• Preserves anal sphincter muscles
• Used for deeper or complex fistulas

4. LIFT Procedure (Ligation of Intersphincteric Fistula Tract)

This procedure targets the fistula between muscle layers and closes it without cutting major muscles.

• Minimizes risk of incontinence
• Suitable for select patients

5. Fibrin Glue or Plugs

Less invasive methods that attempt to seal the tract.

• Variable success rates
• Often used when surgery poses higher risks

Your surgeon will recommend treatment based on:

• Location of the fistula
• Whether muscles are involved
• Your overall health
• History of inflammatory bowel disease

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What Happens If You Don't Treat an Anal Fistula?

Ignoring an anal fistula may lead to:

• Repeated abscess formation
• Worsening pain
• Skin irritation
• Spread of infection
• Rarely, severe systemic infection (sepsis)

Chronic untreated fistulas over many years have been linked, in rare cases, to an increased risk of cancer in the tract. While uncommon, this is another reason long-term drainage should not be ignored.

The good news: most treated anal fistulas heal successfully.

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Recovery and Healing After Treatment

Healing time depends on the procedure. In general:

• Mild discomfort is common for 1–2 weeks
• Drainage may continue temporarily during healing
• Sitz baths can ease discomfort
• Most people return to normal activity within days to weeks

Following your surgeon's aftercare instructions is essential. Proper wound care reduces recurrence risk.

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Reducing the Risk of Recurrence

While not all anal fistulas are preventable, you can reduce complications by:

• Treating abscesses promptly
• Managing inflammatory bowel disease carefully
• Maintaining good hygiene
• Avoiding delayed medical care for persistent symptoms

Early intervention often leads to simpler treatment.

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Taking the Next Step

Living with ongoing drainage or discomfort can be frustrating and embarrassing. But anal fistulas are a well-recognized medical condition with established treatments.

If you're unsure whether your symptoms match an anal fistula, Ubie's free AI-powered symptom checker can help you understand your Anal Fistula symptoms and prepare for your doctor's visit with a personalized report based on your answers.

Most importantly, speak to a doctor — especially if you have:

• Severe pain
• Fever
• Spreading redness
• Weakness or feeling unwell

These could signal a serious infection that needs urgent care.

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The Bottom Line

An anal fistula usually does not heal on its own because the internal tunnel remains open and prone to infection. Persistent drainage is a sign that the tract is still active.

While surgery may sound intimidating, modern techniques are effective and designed to protect bowel control. With proper medical care, most people recover fully and return to normal life.

If you're dealing with painful drainage, don't ignore it — but don't panic either. Get informed, get evaluated, and take the next step toward healing.