You may have also heard the term “leaky veins.”
In some people, the veins and valves in the legs become damaged over time. The blood no longer flows easily back to the heart in one direction.
In addition, gravity is pushing down against the blood trying to flow upwards in the leg veins.
The pressure builds up in the leg veins. Varicose veins can start. The veins become “leaky,” and the fluid from the blood leaks out into the surrounding skin and tissue. It gets trapped in the skin tissue like water in a sponge.