The causes of thigh edema are different, and the clinical symptoms that appear also differ: 1. If the thigh edema is caused by deep vein thrombosis in the lower extremity, the patient will have obvious swelling of the affected extremity, elevated local skin temperature, and obvious symptoms of pressure pain because the deep vein thrombosis blocks the blood return to the lower extremity. If the patient has high tension, tension blisters will be formed on the skin surface. At this time, patients need to dissolve the thrombus and anticoagulation support treatment as soon as possible, after the thrombus dissolves and absorbs, the symptoms of thigh swelling can slowly subside; 2, superficial venous tortuous and cause thigh swelling, at this time, patients will appear superficial skin pigmentation, and even accompanied by the formation of chronic ulcers, the symptoms of serious patients will appear traumatic persistent pain. This condition requires varicose vein stripping as soon as possible to improve the patient’s symptoms.