When to worry about constipation with an anal fissure

An anal fissure is a small tear in the lining of the anus. Hard or large stools and straining can stretch the tear and cause sharp pain during or after a bowel movement. Pain may lead you to delay going to the toilet, allowing stool to become harder and maintaining the cycle. Bright-red blood on toilet paper or on the outside of stool can occur, but bleeding from the back passage should not automatically be attributed to a fissure.

Aim for softer stools by drinking fluids regularly, increasing fibre gradually if it suits you, and responding to the urge to open your bowels. Gentle activity may help bowel movement. Avoid prolonged straining and ask a pharmacist or clinician whether a stool-softening treatment is suitable. Warm water soaks may soothe discomfort. If pain makes bowel movements difficult, arrange an assessment rather than repeatedly postponing them.

Contact a clinician if pain or bleeding persists, constipation keeps returning, or the fissure does not settle with simple measures. Seek urgent help for heavy or ongoing bleeding, black stools, severe abdominal pain, vomiting, a swollen abdomen, fever, or inability to pass stool and gas. These symptoms may need assessment for a problem beyond an uncomplicated fissure.

Ask whether the tear needs prescription treatment, how to soften your stool safely, how long to try self-care, and whether another cause of rectal bleeding should be excluded. Mention pregnancy, medicines, or bowel conditions that may affect treatment choices.