👉 Veins are blood vessels that carry deoxygenated blood back to the heart. Vein valves prevent the backflow of blood, ensuring it moves only in one direction towards the heart. When veins become swollen or inflamed due to various reasons like deep vein thrombosis (DVT), they are referred to as varicose veins. These enlarged, twisted veins can be visible on the surface of the skin and may cause discomfort or pain.
