Swelling and pain on the back of one foot for no reason is considered to be gout, and it is recommended to visit the internal medicine department of a hospital, or the nephrology or endocrinology department. Gout is a metabolic disease, caused by excessive consumption of purine food or problems with purine metabolism. If the blood test reveals a significant increase in uric acid value, it is recommended to drink a lot of water during the acute stage, more than 2000ml per day, limit the activities of the swollen and painful lower limbs, and take oral analgesic drugs such as diclofenac sodium and paracetamol if necessary. After the symptoms are stabilized, oral uric acid excretory drugs, such as benzbromarone, can be taken. It is necessary to develop good dietary habits and eat less food with high purine content, such as beer, seafood and animal offal.