Swollen and painful feet are usually caused by ankle sprain, gouty arthritis, deep vein thrombosis of the lower limbs and other factors, which need to be treated according to the doctor’s instructions, such as general treatment, medication, surgery and so on. 1. Ankle sprains: Ankle sprains can also cause swelling, pain and ecchymosis under the skin, and in severe cases, you can’t even stand or walk normally. Activities should be stopped and cold compresses should be applied, or elastic bandages should be used. In addition, it is necessary to elevate the ankle joint to promote venous blood return and reduce the swelling of the affected area. 2. Gouty arthritis: often occurs in the first metatarsophalangeal joint, ankle, dorsum of the foot and other parts of the affected area may appear red, swollen, pain, fever and other symptoms, after the inflammation subsides, the affected area of the skin can be dark red, accompanied by flaking, itching. During the acute attack period, colchicine, celecoxib and prednisolone can be used to control the condition, and after the symptoms are relieved, oral probenecid and allopurinol are needed to reduce uric acid. 3. Deep vein thrombosis of the lower limbs: it can also cause swelling and pain in the feet, and when the swelling is serious, the skin can be blue-purple and blotchy. Attention should be paid to rest, and elevate the affected limbs. On this basis, follow the doctor’s instructions to use heparin, warfarin, rivaroxaban and other anticoagulant drugs, or the use of bacitracin, reteplase and other drugs thrombolysis, if necessary, but also need to take surgery to remove the thrombus. In addition, there are many other causes of foot swelling and pain, patients are advised to go to the hospital in time to find out the cause of the disease, and then receive treatment as soon as possible. The use of the above drugs should be in accordance with medical advice.