Spider veins and varicose veins are a common disease
You will find detailed information in our vein dictionary
Veins are the blood vessels that transport blood from the body back to the heart. Venous blood is dark red, containing less oxygen and more waste products than arterial blood. The pulmonary veins are the only exception, as they carry oxygen-rich blood from the lungs back to the heart.
Veins contain valves to ensure that the blood from the legs returns to the heart against the force of gravity.