The reason for veins is to flow the blood to different parts of the body and convey it to the heart for decontamination.
There are valves in the veins that keep the blood from streaming in reverse.
At the point when these valves are not working ordinarily, the blood stream is influenced.
They are for the most part found in legs where the veins are far from the heart. Pooling of blood in the veins because of shortcoming in valves prompts the development of varicose veins.
In the legs, the blood gets gathered in light of the fact that it can’t stream towards the heart effectively because of gravity and it won’t stream in reverse because of the valves.