If the patient has painful swelling of both feet: First, endocrine metabolic diseases should be considered, and for severe gout there will be painful swelling of both lower limbs. Second, for cellulitis, such as redness, swelling, heat, pain and joint dysfunction in the surrounding skin or soft tissues, there will also be the above symptoms, and in serious cases, it may also lead to the appearance of dermatitis. Thirdly, for rheumatoid arthritis and rheumatoid arthritis, there will be swelling and pain in both ankles. Fourth, for trauma, such as fracture of the ankle joint or contusion or sprain of the surrounding soft tissues, will also lead to pain. Fifth, if the patient has chronic renal insufficiency, there will also be swelling and pain in both feet. Sixth, chronic cardiac insufficiency, especially in right heart failure, will also have swelling of both lower limbs accompanied by mild pain.