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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.
Vein pain may accompany other symptoms that result from varicose veins or venous insufficiency (poor circulation) including: 1  Cellulitis (common bacterial skin infection). 2  Enlarged, visible veins. 3  Feeling of heaviness in the legs. 4  Hardened tissue under the skin. 5  Leg pain and swelling. 6  Rash. 7  Skin discoloration such as bruising.