Varicose veins in the lower extremities refer to the elongated, tortuous and varicose state of the saphenous and superficial veins of the lower extremities, which are more common in people who work in a standing position, have high physical activity and are sedentary. Weakness of the venous wall, venous valve defects and elevated pressure in the superficial veins are the most important causes of varicose veins in the lower extremities. Varicose veins of the lower extremities are most common with saphenous varicose veins, while small saphenous varicose veins alone are less common and more common in the left lower extremity than in the right lower extremity. The clinical manifestations of cutaneous varicose veins vary according to the early and late stages of the disease. In superficial varicose veins, the blood vessels on the surface of the skin are varicose like earthworms and protrude significantly from the skin, and the varicose is in the shape of a mass or nodule. This is the most common symptom of varicose veins. It is especially obvious after standing and disappears after raising the leg. The limbs have different sensations: the affected limbs often feel heavy, swollen and painful, and easily fatigued, which can be relieved after rest. The skin may have a series of symptoms of varicose veins such as pins and needles, itching, numbness and burning sensation. If the disease is long, the skin of lower leg and ankle has hyperpigmentation, desquamation, itching, eczema, liposclerosis and ulceration. Some patients with varicose veins may have thrombophlebitis as a complication, and the symptoms of local varicose veins are red, swollen, hard and painful to pressure.