Edema of the right lower leg without swelling of the other leg may be caused by reflux obstruction, trauma, other diseases and other reasons. 1. Reflux obstruction caused by various reasons: if unilateral limb has arteriovenous thrombosis, varicose veins and other diseases, it will cause unilateral lower limb edema, as well as soreness and distension, which can be determined by arteriovenous ultrasound; if there is filariasis or just after the surgery, it will also have lymphatic reflux obstruction, which will cause edema. 2. Trauma: If unilateral lower limb fracture, joint dislocation and soft tissue injury occur, edema may be caused by local inflammatory reaction, which may be accompanied by activity limitation and pain, and need to be diagnosed by X-ray and history. 3. Other diseases, such as gouty arthritis and rheumatoid arthritis, may also cause such symptoms, accompanied by localized redness, swelling and pain; if there are fever in addition to redness, swelling and pain, it may also be salpingitis, which needs to be diagnosed through relevant examinations. Therefore, it is recommended to consult a doctor in time after the appearance of symptoms under the guidance of a professional physician to confirm the diagnosis of relevant examinations, and carry out targeted treatment.