The causes of tummy and waist soreness include pelvic inflammatory disease, adnexitis or cervicitis. 1. Pelvic inflammatory disease: mainly due to the invasion of exogenous pathogenic bacteria or endocrine disorders, the patient’s symptoms may be manifested in the stomach and waist soreness, fever or abnormal vaginal secretions. 2. Adnexitis: mainly caused by Chlamydia trachomatis, Neisseria gonorrhoeae or Mycoplasma urealyticum infections, the patient’s symptoms may be manifested as loss of appetite, fatigue, or tummy and waist soreness. 3. Cervicitis: mainly due to pathogenic infections, the patient may not only show symptoms of diarrhea and lumbago, but also may be accompanied by painful urination, vulvar itching or vaginal bleeding. There are many other causes of tummy and waist pain, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease and then targeted treatment.