Anal weakness is considered to be caused by the following conditions: 1, due to congenital nerve disorder in the anorectum, or congenital deformity and the anal weakness is caused by congenital factors.2, it is considered to be caused by hemorrhoids and other anal and intestinal diseases, so that the sphincter of the anus appears to be over-expanded and leads to relaxation, or due to the patient’s age, the muscles appear to be atrophic and lead to the result.3, and there is the possibility that the anal nerve injury leads to the result, Spinal nerve damage or infection triggered anal sphincter function decline. 4, when giving birth to a child due to excessive force, and make the anal sphincter rupture, which led to the anal weakness. Once this symptom occurs, it is best to go to the hospital in time for examination, and then take corresponding treatment measures in time.