Learn more. Anal fissures are tears, or cracks, in your anus. Fissures are sometimes confused with hemorrhoids. These are inflamed blood vessels in, or just outside, the anus. Both fissures and hemorrhoids often result from passing hard stool. Fissures result from the stretching of your anal mucosa beyond its normal capacity.
Error: This is required. Error: Not a valid value. If you see blood in your stool poo , or have pain and discomfort in your bottom, you might have an anal fissure. An anal fissure can be very uncomfortable, but it will usually heal if you make some changes to your diet and follow some simple treatments.
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Back to Health A to Z. An anal fissure is a tear or open sore ulcer that develops in the lining of the large intestine, near the anus. Do not let embarrassment stop you seeking help. Anal fissures are a common problem GPs are used to dealing with.