After working out, the blood vessels appear obvious, indicating that the venous reflux is not smoothly caused, because when working out, the muscles will be congested, the arterial blood supplying the muscles is very much, but the obstruction encountered when the venous blood returns, so the blood vessels appear dilated, the venous blood increases, but the return flow does not go in. The pressure of the blood in the veins will rise, and the blood stagnates and the blood vessels will dilate, so it becomes obvious. It is usually found in the lower extremities because the direction of blood flow in the lower extremities is from the bottom to the top, so it has to overcome gravity and the venous valves, which can cause swelling of the blood vessels in the lower extremities. Especially in the case of varicose veins, after working out, the degree of the visible veins increases, so in this case, it is necessary to wear varicose veins elastic stockings to effectively relieve the symptoms of the visible veins.