Anal Fissures vs Hemorrhoids: Causes, Anatomy, Treatment, and When Surgery Is Needed

Category: Health & Medicine
Tags: Anal fissure, hemorrhoids, rectum anatomy, sphincter muscle, digestive health, constipation, surgery

Introduction

Anal pain during bowel movement is a common but often embarrassing health problem. Two conditions frequently confused with each other are anal fissures and hemorrhoids (piles). Although both affect the anal region and may cause bleeding, their causes, anatomy, and treatment are different.

An anal fissure is a small tear in the lining of the anal canal, whereas internal hemorrhoids are swollen veins inside the rectum. Understanding how these conditions occur and how the anatomy of the rectum works can help in prevention and treatment.

This article explains fissures, why they are increasingly seen in the younger generation, the anatomy of the rectum and sphincter muscles, and when surgery becomes necessary.

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What Is an Anal Fissure?

An anal fissure is a small crack or tear in the thin lining (mucosa) of the anal canal. It usually develops at the opening of the anus where stool exits the body.

The tear exposes sensitive nerve endings and muscles underneath. Because of this, fissures can cause:

• Severe burning pain during bowel movement
• Bright red bleeding on toilet paper
• Spasm of the anal muscles
• A feeling of tearing in the anus

The pain can last for minutes or even hours after passing stool.

fistula or anal fissures vs hemorrhoid mostly found in younger generation illustraion : fissures

Why Anal Fissures Are Increasing in Younger People

Earlier, fissures were more common in middle-aged adults, but doctors now report many cases in young adults and teenagers.

The major reasons include:

1. Chronic Constipation

Young people increasingly consume processed foods with low fiber. This leads to hard stool that can tear the anal lining.

2. Sedentary Lifestyle

Long hours of sitting—especially due to computers and mobile devices—reduce bowel movement efficiency.

3. Low Water Intake

Many young people drink insufficient water, causing dry stool.

4. Frequent Spicy or Junk Food

Highly spicy and processed foods may irritate the digestive tract.

5. Stress and Irregular Eating Habits

Stress affects gut motility and may cause constipation.

All these factors increase the risk of developing fissures.

Difference Between Anal Fissure and Internal Hemorrhoids

Although both conditions may cause bleeding, they are very different.

Feature	Anal Fissure	Internal Hemorrhoids
Main problem	Tear in anal lining	Swollen veins inside rectum
Pain	Severe pain during stool	Usually painless
Bleeding	Bright red streak on stool	Drops of blood in toilet
Cause	Hard stool or trauma	Pressure on rectal veins
Location	Anal canal opening	Inside rectum

Hemorrhoids are mainly vascular swelling, whereas fissures are tissue tears.

Anatomy of the Rectum and Anal Canal

To understand fissures, it is important to know the structure of the lower digestive tract.

1. Sigmoid Colon

The sigmoid colon is the S-shaped final part of the large intestine. Its main functions are:

• Storing fecal matter before elimination
• Absorbing water and electrolytes
• Moving stool into the rectum through muscular contractions

When stool stays too long in the sigmoid colon, excess water is absorbed, making stool hard and difficult to pass.

2. Rectum

The rectum is the final straight portion of the large intestine, about 12–15 cm long.

Functions include:

• Temporary storage of feces
• Signaling the brain when bowel movement is required
• Coordinating the opening of the anal canal

Inside the rectum are folds called rectal columns or columns of Morgagni. These columns contain blood vessels and connective tissue.

Internal hemorrhoids develop from the swelling of these vascular structures.

3. Anal Canal

The anal canal is the last 3–4 cm of the digestive tract. It ends at the anus.

It contains very sensitive nerves, which is why any injury such as fissures causes intense pain.

Sphincter Muscles

Two circular muscles control the opening and closing of the anus.

Internal Anal Sphincter

• Involuntary muscle
• Always partially contracted
• Maintains continence

External Anal Sphincter

• Voluntary muscle
• Controlled by the brain
• Allows conscious control over bowel movement

When a fissure forms, the internal sphincter goes into spasm. This spasm reduces blood supply to the wound, preventing healing and causing repeated pain.

Internal Fissure vs Anal Mouth Fissure

Fissures usually occur at specific locations in the anal canal.

Posterior Fissure (Most Common)

Occurs at the back of the anal opening. About 90% of fissures occur here.

Anterior Fissure

Occurs at the front side of the anus.

Internal Anal Fissure

If the tear extends deeper inside the anal canal, it is sometimes referred to as an internal fissure.

Anal Mouth Fissure

A fissure located directly at the outer anal opening is sometimes called an anal mouth fissure.

Both types cause similar symptoms but may differ slightly in location.

Why Fissures Take Longer to Heal

Unlike cuts on other parts of the body, fissures often take longer to cure.

The reasons include:

1. Constant Mechanical Stress

Every bowel movement stretches the wound again.

2. Muscle Spasm

Sphincter muscle spasm reduces blood flow needed for healing.

3. Bacterial Exposure

The anal region contains bacteria that can delay healing.

4. Chronic Constipation

If constipation continues, the fissure keeps reopening.

Because of these factors, fissures may become chronic, lasting for weeks or months.

Frequent Recurrence of Fissures

Some patients experience fissures repeatedly. This may occur due to:

• Persistent constipation
• Inadequate fiber intake
• Anal muscle tightness
• Inflammatory bowel disease
• Chronic diarrhea

Lifestyle modification plays a major role in prevention.

Treatment Options

Most fissures heal without surgery.

Conservative Treatment

Doctors usually recommend:

• High-fiber diet
• Drinking 2–3 liters of water daily
• Stool softeners
• Warm sitz baths
• Topical medications that relax the sphincter muscle

Many fissures heal within 4–6 weeks with these treatments.

When Is Surgery Recommended?

Surgery may be considered if:

• Fissure persists for more than 6–8 weeks
• Severe pain continues despite medication
• Chronic fissure with scar tissue develops
• Frequent recurrence occurs
• Muscle spasm is very strong

The most common procedure is called lateral internal sphincterotomy.

In this surgery, a small portion of the internal sphincter muscle is cut to reduce pressure and improve blood supply to the fissure.

Is Surgery 100% Successful?

Surgery for fissure has a very high success rate, usually 90–95%.

Benefits include:

• Rapid pain relief
• Faster healing
• Reduced recurrence

However, no surgery is absolutely 100% guaranteed.

Possible risks include:

• Minor infection
• Temporary leakage of gas
• Rare cases of stool incontinence

With experienced surgeons, complications are uncommon.

Prevention Tips

Fissures are largely preventable through healthy bowel habits.

Key prevention strategies include:

• Eating high fiber foods (vegetables, fruits, whole grains)
• Drinking adequate water
• Avoiding prolonged sitting on the toilet
• Exercising regularly
• Treating constipation early

These simple measures maintain smooth bowel movement and protect the anal lining.

Conclusion

Anal fissures are painful but usually manageable conditions caused by tears in the anal lining. They differ significantly from hemorrhoids, which involve swollen veins in the rectum.

Modern lifestyle factors—especially constipation, poor diet, and sedentary habits—are increasing fissure cases among young people. Understanding the anatomy of the rectum, sigmoid colon, and sphincter muscles helps explain why fissures cause severe pain and why healing may take time.

Most fissures respond well to dietary changes and medication. Surgery is recommended only in chronic cases but offers excellent success rates when required.

Maintaining healthy digestive habits remains the best way to prevent fissures and ensure comfortable bowel health.

References

1. National Institute of Diabetes and Digestive and Kidney Diseases – Digestive Diseases Information
2. Cleveland Clinic – Anal Fissure Medical Guide
3. Mayo Clinic – Hemorrhoids and Anal Fissures Clinical Overview
4. World Gastroenterology Organisation – Gastrointestinal Disease Guidelines