How does small bellyache ache and waist ache return a responsibility

Small belly pain and accompanied by symptoms of backache, if it is a woman during menstruation, most of them are due to the high prostaglandin synthesized by the endometrium, resulting in contraction and spasm of uterine smooth muscle, resulting in dysmenorrhea symptoms, which can eventually radiate to the waist, so that the patient is accompanied by symptoms of backache.