The causes of abdominal pain and lumbar pain after menstruation may be caused by eating cold food or catching cold during menstruation. It may also be caused by certain gynecological diseases, such as vaginitis, endometritis, pelvic inflammatory disease, etc. It may also be combined with other diseases, such as lumbar strain, lumbar disc herniation, gastritis, enteritis, etc., which may trigger women to experience abdominal pain and back pain. It is recommended that women go to the hospital for a complete examination to find out what causes the pain, and then take different treatments according to different causes.