The causes of swelling on the top of the right foot of the patient are as follows: First, local reflux obstruction: 1, lymphatic reflux obstruction, uncommon. 2, venous reflux obstruction, you can pass the lower extremity venous ultrasonography, to clarify the cause of obstruction, such as thrombosis, varicose veins, etc., and then carry out active treatment. If thrombosis, low molecular heparin can be applied, varicose veins can be considered for surgical treatment, after active treatment, the obstruction of venous return can be lifted, the swelling of the top of the foot can be significantly improved; 2, gouty arthritis or dengue, etc.: local edema, in addition to localized swelling, and local redness of color and pain.