Anal fissures are longitudinal fissures of the skin of the anal canal, located between the anal verge and the dentate line, which manifest as a rupture of the entire skin of the anal canal, with pain as the main symptom. Patients are mostly young and middle-aged, but children and the elderly are rare. What are the symptoms of anal fissure? 1, pain: is the main symptom of anal fissure, pain severity and duration of anal fissure related to the degree of severity. The pain will subside or disappear within a few minutes to more than ten minutes after the stool, called the pain interval. Then, due to the contraction of the sphincter muscle spasm, there is continuous severe pain, often lasting from half an hour to more than ten hours, and the patient is restless and in great pain. Following the pain disappears, which is a cycle of pain, sneezing, coughing and urination can cause this pain. 2. Bleeding: Anal fissure bleeding is irregular, sporadic and related to defecation. The amount of bleeding is usually small, with fresh blood dripping out during the stool, some on the surface of the stool, some only hand paper stained with fresh blood, large amounts of bleeding are rare. 3, constipation: because of the painful defecation, patients have delayed defecation, so that the feces is retained in the rectum for a longer period of time, water is absorbed, feces becomes dry and hard, and then the pain becomes heavier when defecating, forming a vicious circle. 4, itching: anal canal ulcers, inflammatory stimulation, so that anal gland secretion increases, anal dampness, causing itching. 5.Neuropsychiatric symptoms: Due to long-term persistent severe pain in the anus, visceral nerve dysfunction, loss of appetite, abdominal distension, abdominal pain, and in some cases, abnormal mental excitement, bitterness, restlessness, insomnia, and menstrual disorders. How to prevent anal fissure? The main cause of anal fissure is dry stool, and the anal canal is torn by the hard stool when the toilet is being used, and chronic ulcers are formed after a long time. Therefore, you should keep the stool open, and after the formation of dry and hard stool, do not struggle to discharge, you can use warm saline enema, or liquid paraffin enema, or use the open plug to inject into the anus to lubricate the defecation. Treat anal saphenous in a timely manner to prevent the formation of ulcers and subcutaneous fistulas after infection. Women should pay attention to hygiene during menstruation and not participate in heavy physical labor. During pregnancy, women should eat more fruits and vegetables to prevent constipation. When giving birth, care should be taken to protect the perineum and not to tear the perineum and anus. During anal examination such as anal finger diagnosis, using anoscope or other instruments, do not use rough force to prevent damage to the anal canal causing anal fissure. Promptly treat intestinal diseases such as Crohn’s disease and ulcerative colitis to prevent complications of anal fissures.