Bleeding at night the next day consider contact bleeding, ovulation bleeding or normal bleeding before and after menstruation, as follows: 1, contact bleeding, need to be alert to whether the cervical inflammation, cervical tumors, women need to do gynecological examination, if necessary, can be done colposcopy, the doubtful parts of the local pathology biopsy can be carried out, to find where the disease is and give timely and appropriate treatment; 2, if an occasional occurrence, and If it occurs once in a while and in the middle of two menstrual periods, it may be ovulation bleeding, which is not necessarily abnormal; 3. If it occurs at the end of menstruation, it may be the end of menstruation, and if it occurs before menstruation, it may be the precursor of menstruation, which are not abnormal.