Varicose veins are large, often winding dilated veins that often stick out from under the skin and occur mostly in the legs. They occur because the valves in the veins that prevent blood from flowing backward (away from the heart rather than towards it) are not working properly. In some people this is a hereditary problem, in others the problem may be acquired (multiple pregnancies, large babies, pelvic surgeries, obstructions to the veins of the abdomen, tumors, and injuries to the legs, hip...

