The visible veins on the thighs are actually a manifestation of varicose veins. Varicose veins, according to their course, can be classified as dilated capillaries, revealed veins, and tortuous dilated veins. Therefore, the visible veins on the thighs are a kind of moderate varicose veins and should be treated according to the principles of varicose veins. The majority of patients have congenital weakness of the vein wall, poor function of the vein valves, and the absence of the vein valves, which result in impaired venous return to the lower extremities. Over time, with the influence of the nature of work such as prolonged standing and standing, this can cause poor venous return to the lower extremities, which slowly results in the formation of visible veins and even bruising and expansion, forming varicose veins. Generally, varicose veins start from the ankle and gradually spread upward along the main trunk of the saphenous vein and the small saphenous vein. If the veins spread to the thighs, the degree is relatively heavy and requires professional treatment in the vascular surgery department of a regular hospital.