What is the reason why stool cannot be held back?

Fecal incontinence is a common name. Scientific name is fecal incontinence that is anal incontinence, refers to the body's feces and gas can not be freely controlled, involuntary outflow of the anus, a symptom of defecation dysfunction. Although the incidence of fecal incontinence is not high, but seriously affect the patient's body and spirit, seriously interfere with the patient's normal life and work. The main causes of fecal incontinence are: First, congenital anal malformations may be born with anal incontinence or anorectal malformations. This is the first point. Second, trauma, trauma damage to the anorectal ring, so that the sphincter lost its function, and cause fecal incontinence such as stab wounds, cuts, burns, etc. Third, nervous system diseases, including various brain tumors or brain trauma, can cause fecal incontinence. Fourth, it is anorectal diseases. The most common anorectal diseases include rectal tumors, rectal anal cancer, and Crohn's disease, all of which cause fecal incontinence.