There are two reasons for the thickening of blood vessels, one is physiological and one is pathological, as follows: a. Physiological mainly because of long-term physical exercise or physical labor, which makes the oxygen consumption of muscles increase, the blood supply of arteries increases, so the diameter of arteries will thicken, and the corresponding venous return should also increase, so the veins will also thicken accordingly, this situation is physiological. No further attention is needed. Second, pathological reasons, that is, due to the lower limb venous valve insufficiency, resulting in venous reflux, causing the increase of pressure in the veins, the expansion of blood vessels and tortuous, serious cases such as earthworm-like changes, this situation should be lower limb venous ultrasound examination, and according to the results of the decision whether to perform surgery or conservative treatment.