First, varicose veins caused by poor blood flow in the leg veins, resulting in obstruction of blood return, forming lower limb vein thrombosis or varicose veins, causing swelling and numbness in the lower leg, and in serious cases, leading to muscle spasm and stiffness. Patients should avoid standing or sitting for a long time, pay attention to rest, and usually elevate the affected limb to relieve the symptoms. Patients should use drugs to treat thrombosis and varicose veins, and in serious cases, they should go to hospital for examination in time; secondly, sedentary will lead to squeezing of leg veins, causing poor blood flow, and the compression of leg vessels will lead to reduced blood flow in lower limbs, causing swelling and stiffness; thirdly, poor function of heart and kidneys will also cause swelling and stiffness in calves, because heart is an important organ to promote blood circulation, and heart function Impaired heart function will cause blood circulation to slow down. The kidneys have a diuretic effect, and impaired kidney function will cause fluid discharge from the body resulting in edema; fourth, hypertension, especially in patients with atherosclerosis, will result in slow venous return, leading to edema and stiffness in the lower legs.