Dysmenorrhea after menstruation may be caused by gynecological, excessive blood loss and lumbar spine diseases, as follows: 1. Gynecological problems: such as cervical erosion, uterine fibroids, adnexitis, chronic pelvic inflammatory disease. These continue to flare up after menstruation and can cause menstrual cramps to persist or even worsen. In addition, endometriosis, after the menstruation will also produce dysmenorrhea symptoms; 2, too much blood loss: because of the pre-menstruation lead to blood loss, resulting in damage to the body and resistance, at this time, exertion, cold will aggravate the onset of back pain, dysmenorrhea symptoms; 3, lumbar spine problems: because of the weakness of the menstruation, the original lumbar muscle strain, intervertebral disc caused by the onset, will cause the appearance of dysmenorrhea symptoms after the menstruation.