If you are considering this procedure, the following information may help. Remember, though, this cannot substitute for a consultation with a properly-trained physician. Veins can become enlarged with pools of blood when they fail to circulate the blood properly. These visible and bulging veins, called varicose veins, are often associated with symptoms such as tired, heavy, or aching limbs. Varicose veins are most common in the legs and thighs.
Spider veins are most common in the thighs, ankles, and feet.
They may also appear on the face. Varicose and spider veins can occur in men or women of any age but most frequently affect women of childbearing years and older. Family history of the problem and aging increase one's tendency to develop varicose and spider veins. The causes of varicose and spider veins are not entirely understood. In some instances, the absence or weakness of valves in the veins, which prevent the backward flow of blood away from the heart, may cause the poor circulation.