What is a thrombosed hemorrhoid?
Medically reviewed by Dr. Robert William, MD · Written by Kevin Schwaner · Updated July 2026
Quick Answer
A thrombosed hemorrhoid is an external hemorrhoid in which a blood clot has formed, causing sudden, severe pain and a hard, dark blue or purple lump at the anal opening. Pain usually peaks in the first 48 hours. Early medical evaluation matters, since a doctor can drain a clot within the first few days; after that it typically resolves on its own over one to two weeks.
A thrombosis is a clot inside an external hemorrhoid. The hallmark is sudden, intense pain with a firm, tender, blue-to-purple lump at the anal verge, often after straining, heavy lifting, or prolonged sitting. Pain typically peaks within the first 48 hours and then slowly eases.
Timing shapes treatment. Within roughly the first two to three days, a doctor can perform a simple in-office incision and drainage that relieves the pain quickly. After that window, the clot begins reabsorbing, and conservative care, sitz baths, pain relief, stool softeners, and rest, is usually preferred while it resolves over one to two weeks. Because severe anal pain has other causes, sudden severe symptoms are worth a prompt evaluation.
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Sources
- NIH / NIDDK: Hemorrhoids
- ASCRS Clinical Practice Guidelines for the Management of Hemorrhoids
Related Questions
What is the difference between internal and external hemorrhoids? →When should you see a doctor for hemorrhoids? →How long do hemorrhoids last? →*Informational only, not a substitute for professional medical advice. Any rectal bleeding should be evaluated by a doctor. These statements have not been evaluated by the FDA.