Obvious swelling of the left lumbar region often has the following causes: First, the patient’s left side is impacted by external forces causing obvious swelling of the left psoas major muscle, and the patient is accompanied by painful symptoms in the lumbar region, and it is recommended that the patient take cold compresses for 24 hours to reduce local tissue exudation; after 24 hours, hot amoxicillin packs can be applied externally and blood-stasis activating cream can be applied externally to reduce pain and swelling and promote local inflammation absorption; Second, severe infection of the left kidney abscess will At this time, patients can improve the ultrasound and CT examination of the urinary tract to clarify the infection of the abscess, and if necessary, ultrasound-guided puncture and drainage of the abscess or surgical exploration and drainage of the abscess are feasible, and the swelling and pain of the left waist can be relieved sooner after the infection of the abscess is controlled.