Pain in the anus when defecating is seen in the following diseases: first, hemorrhoids, especially external hemorrhoids, located below the dentate line, which can be painful along with a swelling at the anal opening. It occurs mainly due to increased abdominal pressure, especially after acute constipation, which can trigger the formation of hemorrhoids. Patients may also experience fever and significant anal swelling, and mild cases may improve with conservative treatment. Secondly, patients with anal fissures will have obvious anal pain during defecation, and will also be accompanied by blood in the stool. A fissure can be found in the anus, most commonly in the posterior middle of the anus. Repeated attacks can lead to the formation of local ulcers and can also induce skin and soft tissue infections, as well as local itching. It is important to pay attention to the hygiene of the perianal area, develop a reasonable eating habit, and pay attention to timely cleaning after defecation.
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