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As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia. Each coat has a number of sublayers.
Varicose veins. One common cause of swollen veins is varicose veins and spider veins. Varicose veins appear swollen and distorted, and are dark purple or blue in color. They can occur anywhere on the body but most often show up on the legs and feet. They can also be painful, especially after sitting or standing for a long time.