The right leg is thicker than the left leg for the following three reasons in general: 1, due to K-T syndrome and other venous malformation diseases, making the right leg of the venous reflux disorder, blood stagnation in the right side of the limb, resulting in excess nutrition on the right side, muscle and bone growth, so the right leg is thicker than the left; 2, due to the left limb nerve compression or other factors causing neuropathy, and the left limb dysplasia, so the right leg Under normal circumstances, the right leg will be thicker than the left; 3, the most common situation, that is, the lower limb venous valve insufficiency will lead to blood reflux, reflux to the distal vein caused by increased pressure in the vein, intravenous fluid leakage to the tissue gap caused by edema in the right lower limb, so then the right leg is also thicker than the left leg.