What Causes Varicose veins?
Varicose veins begin when valves inside your leg veins weaken and fail. These valves are essential for keeping blood moving up your leg. If a valve doesn’t work, some blood flows down your leg, causing a condition called venous insufficiency.
On its way down your leg, the refluxing blood reaches the next healthy valve and builds up in that part of the vein. The accumulating blood turns the vein into an engorged, bulging varicose vein. The underlying problem, venous insufficiency, also causes high venous pressure in your lower leg. This can lead to complications.