Anal pain during defecation can be caused by the following diseases: 1. Hemorrhoids are common, usually thrombosed external hemorrhoids, inflammatory external hemorrhoids or internal hemorrhoids, etc., can cause anal pain during defecation, which can be burning pain or swelling pain; 2. Anal fissures can also cause anal pain during defecation, which is usually severe tearing pain, accompanied by blood in the stool and constipation and other symptoms; 3. 4, perianal abscess may also cause anal pain during defecation, usually in the form of swelling pain; 5, anal fissures may also cause anal pain during defecation, which is a slight stabbing pain of fissures; 6, anal neurosis may also cause anal pain during defecation; 7, malignant tumors of the anal canal and rectum sometimes also cause anal pain during defecation. Therefore, if such symptoms appear, you should go to the anorectal department of a regular hospital for examination to make a clear diagnosis.