There is always stool flowing out of the anus, which may be caused by anal sphincter relaxation, anal sphincter injury, anal fistula, hemorrhoids and other reasons. 1. anal sphincter relaxation: refers to the anorectal ring of fecal control decreased, the elderly with age, muscle atrophy, will cause the anal sphincter relaxation, so that the anus always have stool flow out. 2. anal sphincter injury: anal always out of the stool may be anal sphincter injury caused by trauma or surgical injury to the anal sphincter around the anus, will cause the phenomenon of anal laxity, appear to control the ability to decline. 3. anal fistula: there is always stool out of the anus may be caused by anal fistula, due to the fistula and the anus is connected to the anus, the anus will leak from the fistula in the stool, and will lead to repeated infections, but also may be accompanied by perianal skin itching symptoms. 4. Hemorrhoids: Hemorrhoids can cause the anal opening to close poorly, so that the fecal water in the intestinal tract to overflow, which is manifested in the stool out of the anus. There is always stool flowing out of the anus, it is recommended that patients go to the hospital in a timely manner, to clarify the cause of the disease, to give diagnosis and treatment, to avoid delays in the condition of the adverse consequences.