Causes of lower body swelling include gynecological inflammation, uterine lesions, tumor pain and non-inflammatory factors. 1. Gynecological inflammation: cervicitis, vaginitis and chronic pelvic inflammatory disease may induce lumbosacral pain, lower abdominal distension and lower abdominal pain, which may be aggravated by excessive fatigue or after sexual intercourse. 2. Uterine lesions: for example, adenomyosis and endometriosis may induce lower body swelling. 3. Neoplastic factors: for example, gynecological tumors, uterine fibroids, cervical cancer and tubal cysts, etc., once developed to the late stage, may cause intractable pain, causing lower abdominal pain accompanied by lumbosacral pain. 4. Non-inflammatory factors: for example, non-inflammatory lower abdominal distension and pain, including ectopic pregnancy as well as ovarian cysts with torsion of the tip, may cause lower body swelling. In addition, there may be other causes of lower body swelling, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause, and then follow the doctor’s instructions for targeted treatment.