Pain on both sides of the waist and the left side of the belly and a feeling of swelling may be pelvic inflammatory disease, urological diseases, gynecological diseases and other causes, its treatment includes anti-infective, medication, and surgical treatment and other methods. 1. Pelvic inflammatory disease: If it is caused by pelvic inflammatory disease, it is recommended that the patient rest in a semi-recumbent position and give antibiotics such as levofloxacin to carry out regular anti-infective treatment, and during the period of treatment, pay attention to strengthening nutrition. 2. Urological diseases: such as urinary stones and urinary tract infections, etc. If the pain is caused by stones, we should consult the doctor in time for cystoscopic lithotripsy and other treatments; if it is caused by infections, it is recommended to use sensitive antibiotics such as cefixime and other anti-infective treatment. 3. Gynecological diseases: such as endometriosis, adnexal tumors and inflammation and other diseases, it is recommended that the patient promptly to the obstetrics and gynecology department, surgical treatment, such as ovarian adnexal tumor resection. To summarize, there are many other reasons for pain on both sides of the waist and swelling on the left side of the belly, it is recommended to consult a doctor in a timely manner, with the help of a doctor to clarify the cause of the disease, and targeted treatment or treatment.