Constipation can cause anal fissures, and constipation is one of the main causes of anal fissures. Many patients with constipation have dry stools and use excessive force when defecating, which can chafe the skin of the anal canal during the process of discharge, thus causing anal fissures, which are characterized by anal bleeding during defecation and are accompanied by anal pain. Patients may control their diet and bowel movements for fear of pain during defecation, which will aggravate the symptoms of constipation over time, which in turn will aggravate the symptoms of anal fissures, thus forming a vicious circle, so it is very important for patients with anal fissures to keep their bowel movements open. It is very important to keep the bowel movement smooth by improving your diet, such as eating more vegetables and fruits, drinking more water, and taking oral laxatives if necessary, to prevent constipation from aggravating anal fissures.