Sharp Pain or Bleeding? Why Your Anal Fissure Won't Heal & Medically Approved Next Steps

If you're dealing with sharp pain during bowel movements or seeing bright red blood on the toilet paper, you may have an anal fissure. While many anal fissures heal within a few weeks, some linger — causing ongoing pain, bleeding, and frustration.

If your anal fissure won't heal, it's important to understand why and what medically approved treatments can help. The good news: most cases improve with the right care. Let's break it down clearly and honestly.

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What Is an Anal Fissure?

An anal fissure is a small tear in the thin lining of the anus. It often feels like:

• Sharp, cutting pain during bowel movements
• Burning or stinging that can last minutes to hours
• Bright red blood on toilet paper or in the toilet
• A visible crack in the skin near the anus
• A small lump (called a skin tag) near the tear

Anal fissures are common and can affect anyone. They are not usually dangerous, but they can be extremely painful.

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Why Your Anal Fissure Isn't Healing

Most anal fissures heal within 4–6 weeks. When they last longer than 8 weeks, they are considered chronic anal fissures.

Here's why healing may be delayed:

1. Ongoing Constipation or Hard Stools

The most common cause of a non-healing anal fissure is repeated trauma from:

• Hard bowel movements
• Straining
• Infrequent stools

Each hard stool can reopen the tear, restarting the cycle.

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2. Muscle Spasms Reducing Blood Flow

The anus has a circular muscle called the internal anal sphincter. When a fissure forms:

• The muscle may spasm
• Spasms reduce blood flow to the area
• Poor blood flow slows healing

This creates a painful cycle: pain → spasm → reduced healing → more pain.

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3. Chronic Diarrhea

Loose, frequent stools can also irritate and inflame the tear, preventing recovery.

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4. Delayed or Inadequate Treatment

Some fissures don't heal because:

• Fiber intake wasn't increased enough
• Topical medications weren't used consistently
• Treatment wasn't continued long enough

Even if pain improves, stopping treatment too early can cause recurrence.

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5. Underlying Medical Conditions

Rarely, a persistent anal fissure may be related to:

• Crohn's disease
• Ulcerative colitis
• Infection
• Immune conditions

If a fissure appears off-center (not in the typical midline position), a doctor may investigate further.

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When Should You Be Concerned?

While an anal fissure is usually not life-threatening, you should speak to a doctor promptly if you experience:

• Heavy or persistent bleeding
• Fever
• Pus or drainage
• Severe, worsening pain
• Unexplained weight loss
• A fissure that hasn't improved after 6–8 weeks

Rectal bleeding should never be ignored. While fissures are a common cause, other conditions — including hemorrhoids, infections, inflammatory bowel disease, or even colorectal cancer — can also cause bleeding.

If you're experiencing any of these symptoms and want quick, personalized guidance about what might be causing them, check your symptoms with a free AI-powered tool to help determine whether your symptoms require urgent care or can be managed at home.

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Medically Approved Next Steps for Healing

If your anal fissure isn't healing, here are evidence-based treatments doctors recommend.

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1. Fix the Underlying Bowel Issue

Healing starts with softer, regular stools.

Increase fiber intake:

• Aim for 25–35 grams per day
• Fruits (pears, apples), vegetables, whole grains
• Fiber supplements (psyllium is commonly recommended)

Stay hydrated:

• 6–8 glasses of water daily (more if active)

Avoid straining:

• Don't sit on the toilet longer than 5–10 minutes
• Go when you feel the urge

Consistency is key. Even small improvements in stool softness can significantly reduce pain.

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2. Warm Sitz Baths

Sitting in warm water for 10–20 minutes:

• Relaxes the anal sphincter
• Improves blood flow
• Reduces pain and spasm

This can be done 2–3 times daily, especially after bowel movements.

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3. Topical Prescription Medications

If basic measures don't work, doctors often prescribe medications that relax the sphincter muscle.

Common options include:

• Topical nitroglycerin
• Topical diltiazem
• Topical nifedipine

These medications:

• Reduce muscle spasm
• Increase blood flow
• Promote healing

They must be used consistently for several weeks. Mild headaches can occur with nitroglycerin, but many people tolerate treatment well.

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4. Botox Injection

For chronic anal fissures that do not respond to creams:

• Botulinum toxin (Botox) can be injected into the sphincter
• It temporarily relaxes the muscle
• Healing rates are high

This is typically done as an outpatient procedure.

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5. Surgery (When Necessary)

If other treatments fail, a minor surgical procedure called lateral internal sphincterotomy may be recommended.

This procedure:

• Reduces sphincter pressure
• Allows improved blood flow
• Has a very high success rate (over 90%)

While surgery sounds intimidating, it is generally safe and effective. Risks include minor leakage in rare cases, which your surgeon will discuss in detail.

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Common Mistakes That Delay Healing

If your anal fissure won't heal, consider whether any of these apply:

• Stopping fiber once pain improves
• Not drinking enough fluids
• Using over-the-counter creams that aren't designed for fissures
• Ignoring ongoing constipation
• Avoiding medical care out of embarrassment

Anal fissures are common. Doctors treat them regularly. Seeking care early can shorten your recovery time significantly.

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Can an Anal Fissure Heal on Its Own?

Yes — many acute anal fissures heal within weeks with:

• Fiber
• Hydration
• Sitz baths
• Gentle bowel habits

But once a fissure becomes chronic, medical treatment is often needed to break the pain-spasm cycle.

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The Bottom Line

An anal fissure can be intensely painful, but it is usually treatable. If yours isn't healing, the most likely reasons are:

• Continued constipation
• Ongoing muscle spasm
• Incomplete treatment
• Less commonly, an underlying condition

The next step is not to ignore it — it's to address the root cause and, if needed, seek medical care.

If you're uncertain about your symptoms or want to better understand what you're experiencing before your doctor's visit, try Ubie's free symptom checker — it takes just a few minutes and provides personalized insights based on your specific situation.

Most importantly:

Speak to a doctor if you have persistent bleeding, severe pain, symptoms lasting more than 6–8 weeks, or anything that feels unusual or concerning. Rectal bleeding should always be evaluated to rule out more serious conditions.

With proper treatment, most anal fissures heal — and you don't have to live with ongoing pain.