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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 are often painful and have a bluish purple or red color often varicose veins appear swollen and raised the condition is very common especially in women half of all americans over the age of 50 have varicose veins in most cases varicose veins appear on the lower legs