Foam sclerotherapy involves the injection of a foam substance directly into the vein. The foam injures the blood vessels and causes it to narrow. Blood will then flow to a better vein and the treated vein will disappear on its own.
Varicose veins are veins that are swollen and twisted. They are commonly found in the legs. Varicose veins occur when the small valves within the blood vessels or the muscles around the blood vessels malfunction. This can be caused by abnormalities of the veins or of the valves in the veins or due to certain conditions, such as post-thromobotic syndrome or Klippel-Trenaunay Syndrome. Risk factors for varicose veins include pregnancy, excessive body weight, age, sex, standing for long periods, and/or injury to the blood vessels.