What are Varicose Veins? As a result of the valves in the superficial and deep vein system in the legs not closing or leaking back, blood pools in the veins due to the effect of gravity and the subcutaneous veins become fuller and more prominent. This can happen at any age. Among the causes of varicose veins, genetic factors are mostly effective. The main cause of varicose veins is generally hereditary. It usually starts to appear after birth, the reason is during pregnancy...