Heavy and swollen legs can be caused by lactic acid buildup, sciatic nerve compression and venous thrombosis of the lower limbs, which need to be further examined and treated with appropriate physical, medication and surgery. 1. If the soreness is caused by lactic acid buildup due to prolonged inactivity and sudden strenuous exercise, localized hot compresses, physiotherapy, massage and other physical treatments can be applied. 2. If it is clear that a lumbar disc herniation has caused sciatic nerve compression after further CT examination, physical therapy such as acupuncture and physiotherapy, as well as oral administration of non-steroidal anti-inflammatory drugs such as celecoxib and nutritive drugs such as methylcobalamin, etc. can be used to treat it. 3. If further Doppler examination is carried out to clarify that the swelling and pain on one side of the body is caused by venous thrombosis in the lower limbs, oral anticoagulant drugs such as warfarin or rivaroxaban can be taken, and thrombolysis of the lower limb vein cannulae and surgical removal of thrombus can be carried out if necessary. It is recommended to go to the hospital for further examination to clarify the cause of the disease and standardize the treatment under the guidance of the doctor. Please take medication under the guidance of your doctor.