Fart blocking the anal opening and exertion to discharge, mainly due to disease, common diseases including intestinal obstruction, hemorrhoids, anal stenosis and so on. 1. Intestinal obstruction: Intestinal obstruction refers to the obstruction of the passage of intestinal contents caused by various reasons, and the causes and locations of intestinal obstruction are different, which will show different clinical symptoms. Patients with complete intestinal obstruction will have symptoms such as defecation and gas obstruction, abdominal pain and bloating. 2. hemorrhoids: hemorrhoids is the anal canal or the lower end of the rectum venous stasis and swelling of the disease, due to the anal cushion downward or venous enlargement often lead to internal hemorrhoidal prolapse, if hemorrhoids prolapse to the anus near the mouth will affect the patient defecation. 3. anal stenosis: anal stenosis refers to the diameter of the anus and the anal canal becomes small disease, anal canal inflammation, anal fistula anal fissure formation of scarring and congenital anal deformity and other factors will lead to anal stenosis. Patients may feel obstruction during defecation and exhaustion. When patients experience poor anal defecation, it is recommended that they should go to a regular hospital immediately to find out the cause of the disease and be given reasonable treatment measures under the guidance of a professional doctor.