There are many common causes of anal pain after defecation. First, there is a possibility of anal fissure, which is usually due to dry stool and long-term constipation can lead to skin fissures in the anal canal. When defecating, the anal sphincter muscle contraction leads to spasmodic pain, so if the stool is dry, defecation difficulties can lead to anal pain, and generally anal visualization can clearly see a fissure. Second, if the patient often oral spicy, stimulating food such as chili peppers, a lot of alcohol sometimes also leads to anal orifice pain. As these stimulants sometimes stimulate the perianal area, thus making the hemorrhoid nucleus congested and stagnant, sometimes forming thrombus, which manifests itself as a more intense pain around the anus. So there are many causes of anal pain after stool, you can perform anal visual examination, and if necessary, you can also perform anorectal examination or anoscopy to clarify the diagnosis and deal with the symptoms.