Swelling of the right foot compared to the left is usually thought to be the result of localized poor reflux. If the patient presents with edema in both feet and edema symmetry, this usually suggests a systemic cause of edema, that is, cardiogenic, hepatogenic, nephrogenic, endocrinogenic, and idiopathic edema leading to edema. If the right foot is more swollen than the left, this indicates that the right side has a greater impediment to reflux than the left, and the patient is usually asked to undergo a lower extremity venous ultrasound to look at the venous reflux in the lower extremities at this time. In addition, to see if there is any thrombosis in the veins of the lower extremities, if there is thrombosis, timely antithrombotic treatment, the patient’s edema can be reduced to a certain extent. If the patient is suffering from varicose veins, etc., the impaired reflux can also be improved by vascular surgery. So unilateral swelling of the foot is more severe than the other side, often suggesting that poor reflux is the cause.