Anal cramps during menstruation may be caused by physiological phenomena, dysmenorrhea and anal canal diseases. 1. Physiological phenomenon: menstruation refers to menstruation, when menstruation due to pelvic congestion and increased secretion of prostaglandins and other reasons, can cause some women to appear in the lower abdomen and lumbar-sacral drop discomfort, can also appear in diarrhea and other gastrointestinal dysfunction, which causes anal cramps, this is a normal physiological phenomenon, generally in the menstrual period after the return to normal. 2. Dysmenorrhea: it is due to the endometrial prostaglandin increase during menstruation, and may also be caused by the combination of adenomyosis, endometriosis and other pathological reasons, which is manifested as severe abdominal pain at the time of menstruation, and may be accompanied by nausea, vomiting, diarrhea and other symptoms, which may also cause anal cramps. Combined with the medical history, clinical manifestations can be diagnosed. 3. Anal canal diseases: such as perianal abscess, anal fissure, hemorrhoids, etc., during menstruation due to pelvic floor tissue congestion, increased prostaglandins, diarrhea, etc., can exacerbate the cause of the underlying disease and cause anal cramps, usually at the end of the menstrual period can not be relieved, can be assisted in the diagnosis of the surgical examination, rectal examination and so on. Anal cramps during menstruation can be treated in the hospital in order to identify the cause and deal with it promptly.