Fecal incontinence, also known as anal incontinence, means that when the function of the anus is impaired, feces or intestinal fluid involuntarily leaks out of the anus. Therefore, it can be divided into two aspects: the first aspect is that some people only have incontinence of liquid stool, not solid feces; the other is that both solid and liquid stools are incontinent, both can involuntarily leak out, with the latter scenario being more severe. The causes are generally due to damage to the anus, congenital anomalies of the anus, damage to the anal sphincter, or diseases of the anus, among other reasons.