Loss of anal reflexes leads to incontinence, and careful questioning and physical examination can identify the cause of most fecal incontinence. Pre-treatment radiologic and physiologic studies confirm the diagnosis, and relevant gastrointestinal abnormalities and detection of anal sphincter defects provide objective baseline information. The presentation is characterized by varying degrees of uncontrolled defecation and evacuation, with mild incontinence characterized by loss of control over evacuation and liquid feces and occasional soiling of underwear, and severe incontinence characterized by lack of control over solid feces and frequent anal evacuation of feces, which can be avoided if the patient is able to locate a toilet quickly enough to avoid soiling of clothing and pants. The quality of life and physical and mental health of patients with this disease are often affected by the prolonged wetness and uncleanness of the perineal area, which contaminates clothes, pants, bed sheets, and so on. Physical examination can see moist and unclean anal perineal area, eczema ulcer scarring, perianal skin scarring anal laxity, sometimes see rectal prolapse mandarin. Finger examination can touch hard fecal mass or tumor, etc. There can be anal sphincter relaxation and stretching, and its contraction force is weakened or disappeared. Careful examination can accurately determine the site of contractile weakness and can show the loss of anal canal reflex. Differential diagnosis of the disappearance of anal tube reflex: 1, anal relaxation: anal relaxation, contraction of the anal canal when the sphincter and anorectal ring contraction is not obvious and completely disappeared, such as for the injury caused by the anus can be found in the anal part of the scar tissue, incomplete incontinence can be found in the sphincter contraction force of the palpation is weakened. It is common in anal incontinence. 2, fecal incontinence: due to anal or nerve damage, resulting in the phenomenon of not being able to control the discharge of feces and gas. Also known as fecal incontinence or anal incontinence. Those who can’t control both dry and loose stools are called complete incontinence; those who can control dry stools but can’t control loose stools and gas are called incomplete incontinence. Defecation is a complex and coordinated reflex action, a reflex activity accomplished under the dual innervation of the visceral vegetative nerves and the central nervous system of the brain. Fecal incontinence can occur with resection of the lower end of the rectum, impairment of nerve reflexes and loss of anal sphincter tone. In the elderly, anal incontinence can be caused by atrophy of the anal sphincter. Temporary fecal incontinence can also occur when suddenly frightened. 3, anal sphincter rupture: anal sphincter rupture is caused by a variety of factors, strong mechanical impact makes anal trauma, can lead to anal sphincter rupture, in addition, the surgical process of carelessness can also lead to anal sphincter rupture, making fecal incontinence.