Varicose veins are those superficial veins that have become stretched, dilated and twisted. Smaller, bluish veins just under the skin's surface are called spider veins, also known as telangiectasia. Varicose veins are common and are almost never a serious problem. Blood clots rarely develop in varicose veins.
Varicose veins are enlarged, twisted, painful superficial veins resulting from poorly functioning valves.
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What Causes Varicose Veins?
The exact cause of varicose veins is not known. Factors that may lead to their development include:
If vein valves become stretched and do not close tightly, blood can pool in the lower legs. Pooling of blood further increases the pressure against the vein walls. This increased pressure may also cause the veins to stretch further and to bulge.
Symptoms of Varicose Veins
Symptoms of varicose veins depend on the type and size of the veins. They may include:
Review Date: 02/05
