Swelling of the dorsum of one foot may be caused by trauma, lower limb vascular disease, infection, gout and other reasons. 1. Trauma: one dorsum of one foot is swollen due to fracture, dislocation, tendon and other soft tissue injuries caused by collision of one side of the foot, local edema, bleeding and other changes. 2. Lower extremity vascular disease: one side of the lower extremity vascular disease, such as lower extremity deep vein thrombosis, varicose veins and other diseases caused by lower extremity blood reflux obstacles, may appear a dorsal swelling symptoms. 3. Infection: due to bacterial infection and other pathogens, causing localized suppurative infection or tuberculosis of the feet, patients may have symptoms such as redness, swelling, heat and pain on the back of one foot. 4. Gout: due to a variety of causes of uric acid levels rise in the body, easy to deposit in the feet. Severe cases will have gout stone formation, patients may appear on the back of one foot red, swollen, pain and other symptoms. There may be other reasons for the swelling of the back of one foot, it is recommended to consult a doctor in time, with the help of the doctor to clarify the cause of the disease, and targeted treatment or therapy.