Veins are blood vessels that carry blood from the body toward the heart for recirculation. In our body, systemic veins are classified into superficial veins (located in the fatty layer under the skin) and deep veins which are found in muscles or along bones. Within the veins, especially those of the legs are valves, flap like structures made of elastic tissue. The valve’s function is to keep blood moving in one direction against gravity. Muscle contractions in lower legs act as pumps and vein walls help blood returning to the heart. As a regular pattern, tiny valves in veins open as blood flows toward the heart and close to stop blood from flowing backward. If these valves are weakening or damaged, blood can flow backward and pool in the veins, causing the veins to stretch or twist, leading to varicose veins.
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