The situation is not normal for more than 10 days, there are many reasons: 1, may be due to cold, cold and problems, if the body is not good or disease, will lead to prolonged menstruation and other problems. 2, may be caused by mood, usually too much psychological stress, excessive tension will also lead to endocrine disorders, thus causing prolonged menstruation. 3, may also be caused by environmental factors, endocrine factors, etc., the endometrium will be shed during the period, about 3-7 days will gradually disappear. The endometrium will all be shed during menstruation and the period will gradually disappear in about 3-7 days. If the prolonged menstrual period is considered to be caused by incomplete shedding of the endometrium, it will lead to increased bleeding. 4. It may be caused by gynecological diseases, such as endometritis, pelvic inflammatory disease and other diseases.