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Published on: 7/14/2026
An anal lump is often caused by hemorrhoids, particularly a thrombosed (clotted) hemorrhoid, but it can also result from less common conditions like an anal abscess, anal fissure with skin tag, or in rare cases, a tumor. Warning signs that require prompt medical evaluation include persistent pain, bleeding, changes in size, or lumps that don't resolve within a few days.
Because these symptoms can stem from many different conditions—ranging from minor to serious—identifying the likely cause early helps you seek the right care faster. Take a free, instant, online symptom check to better understand what may be going on and confidently plan your next steps.
Reviewed for medical accuracy: 07/14/2026
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Submit your own QuestionThere are several reasons you might find a lump inside the anus. One usual cause is a thrombosed hemorrhoid. Hemorrhoids are swollen blood vessels, and when a clot forms in one, it can feel like a hard lump and cause significant discomfort. Many times, these can be managed with simple care like warm sitz baths, over-the-counter pain medicine, and adjusting your diet to include more fiber. However, sometimes a lump could also indicate a perianal abscess, which is an infection that may need drainage by a doctor, or it may rarely be linked to a malignancy, which is a type of cancer. If you notice that the lump is very painful, it grows in size, or if you experience other symptoms—like bleeding or changes in bowel habits—it is important to see a doctor. Before your appointment, you can check your symptoms to better understand what might be causing your discomfort. A healthcare provider can examine the lump to determine its exact cause. Based on what they find, treatment could range from conservative management, such as home care for hemorrhoids, to surgical procedures if more serious conditions are discovered.
(References)
Greenspon J, Williams SB, Young HA, Orkin BA. Thrombosed external hemorrhoids: outcome after conservative or surgical management. Dis Colon Rectum. 2004 Sep;47(9):1493-8. doi: 10.1007/s10350-004-0607-y. Epub 2004 Aug 12. PMID: 15486746.
Boaz E, Freund MR, Harbi A, Dagan A, Gilshtein H, Reissman P, Yellinek S. Anorectal Malignancies Presenting as a Perianal Abscess or Fistula. Am Surg. 2023 Jun;89(6):2572-2576. doi: 10.1177/00031348221101481. Epub 2022 May 27. PMID: 35621130.
Bertagni A, Vagliasindi A, Ascari Raccagni A, Valmori L, Verdecchia GM. Perianal Bowen's disease: a case report and review of the literature [Perianal Bowen's disease: a case report and review of the literature]. Tumori. 2003 Jul-Aug;89(4 Suppl):16-8. Italian. PMID: 12903534.
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