Thrombosed Hemorrhoid

A thrombosed hemorrhoid occurs when a blood clot (thrombus) forms inside an external hemorrhoid. This condition can cause sudden and severe pain, swelling, and a firm lump near the anus.

Thrombosed hemorrhoids most commonly occur in external hemorrhoids, which develop under the skin around the anus. The trapped blood clot causes increased pressure and inflammation, leading to significant discomfort.

Although thrombosed hemorrhoids can be painful, they are usually not dangerous and often improve within several days to weeks.

Dr. Aisha Akhtar, a board-certified colorectal surgeon in Phoenix, evaluates and treats thrombosed hemorrhoids using both conservative treatments and minimally invasive procedures when necessary.

What Is a Thrombosed Hemorrhoid?

A thrombosed hemorrhoid develops when blood becomes trapped inside a hemorrhoidal vein and forms a clot.

This clot causes the hemorrhoid to become:

• Enlarged
• Hard
• Tender
• Discolored

Because the clot stretches the surrounding skin, thrombosed hemorrhoids often cause more intense pain than typical hemorrhoids.

Learn more about the general condition:

• Hemorrhoids

Is a Purple Hemorrhoid Usually a Thrombosed Hemorrhoid?

Often, yes. A purple hemorrhoid commonly refers to a thrombosed external hemorrhoid, especially when it appears suddenly and causes significant pain.

The purple or blue color occurs because blood becomes trapped inside the hemorrhoid and forms a clot. This creates pressure, swelling, and discoloration under the skin around the anus.

A purple hemorrhoid may:

• Appear suddenly
• Feel firm or tender
• Cause severe pain when sitting or during bowel movements
• Become swollen over 1 to 2 days

Not every purple bump near the anus is a thrombosed hemorrhoid, so persistent or severe symptoms should be evaluated by a specialist.

What Does a Thrombosed Hemorrhoid Look Like? Can It Look Purple?

Yes. A thrombosed hemorrhoid often looks like a purple hemorrhoid or a dark bluish lump near the anus.

Typical features include:

• A firm lump near the anus
• Purple, blue, or dark discoloration
• Swelling and inflammation around the area
• Tenderness to touch

The lump may feel similar to a small marble or grape under the skin.

Some patients notice it after:

• Straining during a bowel movement
• Constipation
• Heavy lifting
• Prolonged sitting
• Pregnancy

Symptoms of a Thrombosed Hemorrhoid

Symptoms usually develop suddenly and may include:

• Severe anal pain
• A hard lump near the anus
• Swelling around the anal opening
• A purple or bluish bump
• Tenderness when sitting
• Bleeding if the clot ruptures

Pain is usually most intense during the first 48–72 hours, after which the clot gradually begins to shrink and symptoms improve.

What Does a Thrombosed Hemorrhoid Look Like?

A thrombosed hemorrhoid typically appears as:

• A firm lump near the anus
• Dark purple or bluish discoloration
• Swelling and inflammation around the area

The lump may feel similar to a small marble or grape under the skin.

Some patients notice the lump suddenly after straining during a bowel movement or heavy lifting.

Causes of Thrombosed Hemorrhoids

Thrombosed hemorrhoids occur when pressure increases in the veins around the anus, allowing blood to pool and clot.

Common causes include:

• Straining during bowel movements
• Chronic constipation
• Chronic diarrhea
• Prolonged sitting on the toilet
• Heavy lifting
• Pregnancy
• Obesity
• Long periods of sitting

These factors increase pressure in the rectal veins, which can lead to both hemorrhoids and thrombosis.

Learn more:

• What Causes Hemorrhoids

How Long Do Thrombosed Hemorrhoids Last?

Most thrombosed hemorrhoids improve gradually over time.

Typical recovery timeline:

In some cases, a small skin tag may remain after the clot resolves.

Treatment for Thrombosed Hemorrhoids

Treatment depends on the severity of symptoms and how long the hemorrhoid has been present.

Conservative Treatment

Many thrombosed hemorrhoids improve with simple measures such as:

• Warm sitz baths
• Anti-inflammatory medications
• Topical creams
• Increased fiber intake
• Stool softeners
• Avoiding straining during bowel movements

These treatments help reduce inflammation and allow the clot to resolve naturally.

Minor Surgical Procedure

If a thrombosed hemorrhoid causes severe pain within the first 48–72 hours, a colorectal surgeon may recommend removing the clot.

This procedure involves:

• Local anesthesia
• A small incision in the hemorrhoid
• Removal of the blood clot

Relief is usually immediate after clot removal.

Surgical Hemorrhoid Treatment

In rare cases, surgery may be recommended if thrombosed hemorrhoids occur frequently or are associated with severe hemorrhoidal disease.

Procedures may include:

• Hemorrhoidectomy
• Rubber Band Ligation

Is a Purple Hemorrhoid Dangerous?

Usually, no. A purple hemorrhoid is often painful but not dangerous.

However, you should seek medical evaluation if you have:

• Severe or worsening pain
• Heavy or persistent bleeding
• A rapidly enlarging lump
• Fever
• Drainage
• Symptoms that do not improve

Other anorectal conditions can sometimes mimic a thrombosed hemorrhoid, including:

• Anal fissures
• Perianal abscesses
• Skin tags
• Other anorectal lesions

A specialist can confirm the diagnosis and recommend the most appropriate treatment.

When Should You See a Doctor?

You should seek medical evaluation if you experience:

• Severe anal pain
• A rapidly enlarging lump near the anus
• Persistent bleeding
• Symptoms lasting more than one week
• Recurrent thrombosed hemorrhoids

A specialist can confirm the diagnosis and rule out other conditions such as anal fissures, abscesses, or colorectal disease.

Preventing Thrombosed Hemorrhoids

Preventive measures focus on reducing pressure in the rectal veins.

Helpful strategies include:

• Eating a high-fiber diet
• Drinking adequate fluids
• Avoiding prolonged sitting on the toilet
• Exercising regularly
• Maintaining a healthy weight
• Treating constipation early

These steps help reduce the risk of both hemorrhoids and thrombosis.

FAQ About Purple Hemorrhoids

Why is my hemorrhoid purple?

A hemorrhoid may look purple when blood becomes trapped inside it and forms a clot. This is commonly called a thrombosed hemorrhoid.

Is a purple hemorrhoid always thrombosed?

Not always. A purple lump near the anus is often a thrombosed external hemorrhoid, but other anorectal conditions can look similar. A specialist can confirm the diagnosis.

How long does a purple hemorrhoid last?

Pain is usually worst during the first 48–72 hours, and the lump often shrinks over 1–3 weeks as the clot resolves.

Can a thrombosed hemorrhoid go away without surgery?

Yes. Many thrombosed hemorrhoids improve with conservative treatment, including sitz baths, anti-inflammatory medication, fiber, and stool softeners.

Related Hemorrhoids Guides

• Hemorrhoids Overview
• Hemorrhoids Symptoms
• Hemorrhoids Procedures
• Hemorrhoids FAQ
• Hemorrhoids Images & Diagrams