Thrombosed Haemorrhoid: The Sudden Painful Lump
Why a clot in an external haemorrhoid hurts so much, the timeline it follows, why the first 72 hours matter, and what else a painful lump can be.
Part of the Complete Haemorrhoids Guide.
Key fact: A thrombosed external haemorrhoid is a clot stretching skin that is richly supplied with nerves — hence pain out of proportion to a small lump. It is not dangerous and settles over one to two weeks, but if the pain is severe, being seen inside the first 72 hours opens the option of removing the clot.
What a thrombosed haemorrhoid is
A thrombosed external haemorrhoid is a blood clot inside an external haemorrhoid. The clot stretches the skin over it, and because that skin is richly supplied with nerves, the result is pain out of all proportion to the size of the lump.
It typically arrives suddenly — often after straining, constipation, a long period of sitting, heavy lifting, or late pregnancy and childbirth. People describe a firm, tender, bluish or purple lump at the anal margin that was not there the day before.
The reassuring part: a thrombosed haemorrhoid is not dangerous, and it resolves. Pain is usually worst in the first 48 hours, eases over the following days, and the lump itself shrinks over one to two weeks. It sometimes leaves a painless skin tag behind.
What to expect, and when
| When | What typically happens |
|---|---|
| First 48 hours | Pain at its worst; sitting, walking and passing stool are all uncomfortable |
| Days 3–5 | Pain begins to ease noticeably, though the lump is still present and tender |
| 1–2 weeks | Lump shrinks and softens; discomfort largely resolves |
| Afterwards | A skin tag may remain. It is harmless, though it can be a nuisance for hygiene |
A thrombosed haemorrhoid occasionally ulcerates and discharges dark blood, which usually relieves the pain sharply. That is alarming to see but not itself a cause for concern — though any bleeding you are unsure about should be assessed rather than assumed, as in rectal bleeding compared.
Why the first 72 hours matter
If the pain is severe, get seen early. Where a thrombosed external haemorrhoid is very painful and presents within roughly the first 72 hours, a clinician may offer a minor procedure to remove the clot, which can relieve pain quickly. After that window the pain is usually already improving on its own, so conservative management becomes the sensible course. That timing is the one thing worth knowing in advance.
Managing it at home
- Regular pain relief — paracetamol, with ibuprofen if it suits you. Avoid codeine, which constipates and makes everything harder
- Keep the stool soft — fluid, soluble fibre, and a laxative if needed. Straining against a hard stool is the worst thing for it
- Warm shallow baths several times a day, and especially after opening your bowels
- Ice pack wrapped in a cloth, for 10 to 15 minutes at a time in the first day or two
- Topical treatment containing a local anaesthetic can take the edge off — see the creams compared
- Avoid prolonged sitting; stand or lie down rather than sitting on hard surfaces, and use a cushion if you must sit
- Do not try to squeeze, lance or drain it yourself — this risks infection and bleeding without relieving anything
What else a painful lump can be
| Condition | What points to it instead |
|---|---|
| Perianal abscess | Throbbing pain that builds over days, spreading redness, swelling, fever and feeling unwell — needs urgent surgical assessment, not cream |
| Anal fissure | Sharp pain on passing stool rather than a constant painful lump — see fissure vs piles |
| Perianal haematoma | Effectively the same picture; the terms overlap in practice and management is the same |
| Skin tag | A painless flap of skin, often the residue of a previous thrombosed haemorrhoid |
| Infected hair follicle or cyst | Centred away from the anal margin, often with a visible head |
Seek urgent medical help if you develop a fever, spreading redness, worsening throbbing pain over days rather than improving pain, discharge of pus, difficulty passing urine, or you feel generally unwell. Those features suggest an abscess or infection, which needs prompt surgical assessment rather than home treatment.
Reducing the chance of another
The trigger is nearly always pressure: straining, constipation, prolonged sitting or heavy lifting. Keeping the stool soft, not straining, limiting time on the toilet and moving regularly all lower the risk — the full set is in how to stop piles coming back. If it happened during pregnancy or after giving birth, piles in pregnancy covers that situation specifically.
Frequently Asked Questions
What does a thrombosed haemorrhoid feel like?
A sudden, firm, very tender lump at the anal margin, often bluish or purple, with pain out of proportion to its size because the skin over it is stretched and richly supplied with nerves. Sitting, walking and passing stool are all uncomfortable, and it typically appears after straining, constipation, prolonged sitting or childbirth.
How long does a thrombosed haemorrhoid last?
Pain is usually worst in the first 48 hours, eases noticeably over the next few days, and the lump shrinks over one to two weeks. A painless skin tag sometimes remains afterwards. It is not dangerous and it does resolve.
Should I get it drained?
If the pain is severe and you present within roughly the first 72 hours, a clinician may offer a minor procedure to remove the clot, which can relieve pain quickly. Beyond that window pain is usually improving anyway, so conservative treatment is the sensible course. Never try to lance or squeeze it yourself.
Can I pop it myself?
No. Squeezing, lancing or draining it yourself risks infection and bleeding without relieving the pressure properly. If pain is severe, get it assessed early rather than attempting anything at home.
Is a painful lump always a haemorrhoid?
No. A perianal abscess causes throbbing pain that builds over days with spreading redness, swelling, fever and feeling unwell, and needs urgent surgical assessment. An anal fissure causes sharp pain on passing stool rather than a constant lump. Worsening pain over days, fever or pus means being seen urgently.
It burst and dark blood came out. Is that bad?
A thrombosed haemorrhoid sometimes ulcerates and discharges dark blood, and this often relieves the pain sharply. It is alarming to see but not usually a cause for concern in itself. Keep the area clean, and have any bleeding you are unsure about assessed rather than assumed.
References
- NHS. Piles (haemorrhoids). nhs.uk
- NHS. Anal fissure. nhs.uk
- National Institute for Health and Care Excellence. Clinical Knowledge Summary: Haemorrhoids. cks.nice.org.uk
- National Institute for Health and Care Excellence. Suspected cancer: recognition and referral (NG12). nice.org.uk
- National Institute for Health and Care Excellence. Quantitative faecal immunochemical testing to guide referral for colorectal cancer in primary care (DG56). nice.org.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Rectal bleeding should never be assumed to be haemorrhoids without assessment. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.