The two legs are not the same thick, it may be that the activities or exertion of the two legs are not the same, and the leg which is often exerted is thicker than the one which is not exerted, if it is caused by this reason, we should adjust the activities of the two legs, and the thicker leg may have thrombophlebitis, varicose veins, arteriosclerosis and other diseases. It is recommended to go to the hospital for examination, you can do leg vascular ultrasound to check whether the blood in the blood vessel is smooth, whether there is plaque formation, etc. If it is caused by disease, please treat it in time so as not to cause other complications.