Most of the swelling and pain in the lower leg are caused by the venous thrombosis of the lower limb, or varicose veins of the lower limb, phlebitis, which can be treated as follows: first, oral medication, oral pain medication, such as meloxicam, celecoxib, aminogest, can be used to relieve pain, and oral swelling medication, such as horse chestnut seed extract, this drug has a good effect on the swelling of the lower leg. Second, local physical therapy, such as hot compresses, can also play a certain role in reducing swelling, while avoiding cold, avoiding long periods of standing, and elevating the calf when sleeping, which is conducive to reducing swelling. If the pain and swelling is caused by varicose veins, external compression stockings should be worn to reduce the swelling and pain. If the swelling and pain in the calf is due to a blood clot, anticoagulant medication should be administered. If the swelling is due to other causes, such as low protein or kidney or heart disease, the original cause of the swelling should be treated.