Anal fissures are small ulcers formed after the skin layer of the anal canal below the dentate line is fractured, which are oriented parallel to the longitudinal axis of the anal canal and are about 0.5-1.0 cm long, shuttle-shaped or oval-shaped, often causing severe pain and difficult healing. It occurs in young adults, but can also occur in children and less frequently in the elderly. Anal fissures are more common in men than in women, but occur in 10% of women after childbirth. Anal fissures often occur in the back and front of the anus, mostly in the back of the anus and less often in the sides. Initially, there is only a small fissure in the skin of the anal canal, but sometimes the fissure may go to the subcutaneous tissue or to the superficial layer of the sphincter. The fissure is linear or prismatic, and if the anus is opened, the fissure becomes round or oval in shape. Early and timely treatment can be cured. Non-surgical treatment 1. Adjust diet: For acute fresh anal fissures, adjusting diet, softening stool and paying attention to personal hygiene can relieve fissure symptoms and promote fissure healing. Eat more vegetables and fruits, increase water intake, and correct constipation. 2. Sitz bath: Use warm salt water or Chinese medicine sitz bath at 40℃～50℃ (2～3 times a day, 20～30 minutes each time. Warm water bath can relax the anal sphincter, improve local blood circulation, promote the absorption of inflammation, reduce pain, and clean the local area to facilitate the healing of the wound. After the sitz bath can be hemorrhoid plugs anal, external anti-inflammatory and pain relief drugs to reduce symptoms. 3, oral medication: oral laxative such as Fosone, lactulose or paraffin oil to make the stool loose and lubricated to facilitate defecation. The prevention of adult anal fissure should be to develop the habit of regular defecation every day, eat more vegetables to keep the stool smooth, to prevent constipation, avoid tobacco, alcohol, spicy and stimulating food, eat more fresh fruits, vegetables and coarse fiber food to maintain anal hygiene, after the stool should be timely cleaning the anus, diligent bathing, diligent replacement of underwear, can effectively prevent infection, in addition to anal fissure patients can not be too tight underwear, too tight underwear on the one hand The tight underwear on the one hand affects the local blood circulation around the anus, slowing down the healing of the wound, and on the other hand will increase the reproduction of bacteria, thus aggravating the condition. 1, appropriate to participate in physical activities, such as exercise, running, tai chi, etc., can prevent the occurrence of constipation. 2, timely treatment of anal sinusitis, to prevent the formation of ulcers and subcutaneous fistula after infection, warm water fumigation sitz bath after the stool, so that the anal fissure trauma to keep clean, anti-inflammatory and pain relief and promote the role of wound healing. 3.Prevent complications of anal fissure: timely treatment of intestinal diseases such as Crohn’s disease, ulcerative colorectitis and anal tuberculosis to prevent complications of anal fissure. 4.Prevent medical anal canal injury: during the anal examination, operate gently and appropriately, and avoid rough and forceful rectal diagnosis and speculum insertion to prevent medical anal canal injury and anal fissure.