The most common causes of lower abdominal cramps and lumbago in clinical practice are the following: 1. caused by chronic pelvic inflammatory disease, due to chronic inflammation of the pelvis, the history of the disease will be relatively long, it will lead to pelvic tissue congestion and edema, resulting in exudate leakage, so the pelvic tissue will appear adhesions, repeated lower abdominal cramps, because the inflammation has spread to the sacral ligament, so there will also be lumbago. It is recommended that in addition to strengthening nutrition and resting as much as possible, but anti-inflammatory treatment must be given. 2. caused by endometriosis, endometriosis lesions will also bleed during menstruation, so repeated bleeding will cause adhesion of pelvic tissues and also 3. pelvic tumors can also cause this condition. Therefore, when lower abdominal pain and lumbar pain occur, you must go to the hospital for examination. In addition to gynecological examination, ultrasound examination is also recommended, and treatment will be given according to the results.