Thrombosed External Hemorrhoid

A thrombosed external hemorrhoid — one containing a blood clot — is usually the single most acutely painful presentation of hemorrhoidal disease, and often the reason people seek care urgently rather than trying self-care first.

Key takeaways

A clot forms within swollen external hemorrhoidal tissue, causing a firm, often intensely painful lump.
Pain is typically most severe in the first 24–72 hours, then gradually improves over one to two weeks as the clot is naturally reabsorbed.
An in-office procedure to remove the clot can provide much faster relief than waiting, particularly if done within the first couple of days.

What it is

External hemorrhoids sit below the dentate line, in nerve-rich tissue. When a blood clot forms within this swollen tissue, it creates a firm, tender lump that can be intensely painful — far more painful, typically, than internal hemorrhoid symptoms, given the dense pain-sensitive nerve supply in this specific area.

Symptoms

Sudden onset of significant anal pain, often described as severe
A firm, tender lump you can feel or see near the anus
Sometimes a bluish or purplish discoloration of the lump, reflecting the clot underneath
Swelling in the surrounding area

What causes it

The exact trigger isn’t always clear, but thrombosis is generally associated with the same factors that contribute to hemorrhoids more broadly — straining, prolonged sitting, pregnancy, or a sudden increase in pressure (heavy lifting, for example).

The typical course without treatment

Left untreated, a thrombosed external hemorrhoid typically follows a pattern: most severe pain in the first 24–72 hours, followed by gradual improvement over roughly one to two weeks as the body naturally reabsorbs the clot. Some residual skin tag can be left behind after the tissue resolves.

Treatment options

Cold therapy and pain management — reasonable for milder cases or once past the acute early window (see Ice and cold therapy for thrombosed hemorrhoids)
In-office incision and drainage — removing the clot directly, generally most beneficial within the first 48–72 hours of severe pain, providing much faster relief than waiting for natural resolution (see Thrombosed hemorrhoid: incision and drainage)

Why timing matters for deciding on a procedure

The relative benefit of having the clot removed decreases the further out you are from the acute onset, since the natural pain reduction process is already underway by then. If you’re experiencing severe pain from a suspected thrombosed hemorrhoid, seeing a doctor promptly — rather than waiting several days — gives you the option of faster relief if a procedure is appropriate for your timeline.

When to seek care

Severe, sudden anal pain with a firm lump, ideally evaluated within the first couple of days
Any thrombosed hemorrhoid that seems to be getting worse rather than following the expected gradual improvement
Uncertainty about whether what you’re feeling is a thrombosed hemorrhoid or something else (like an abscess) — see Anal abscess: a surgical emergency for a condition that can look similar but needs different, more urgent treatment

Not sure if this is a thrombosed hemorrhoid or an abscess? See Anal abscess: a surgical emergency for the distinguishing features.

This page is for general education. Severe or worsening pain warrants prompt evaluation.