Returning Blood to the Heart
To get from the feet and legs to the heart, blood has to flow upward meaning that it must work against gravity. The action of the calf and thigh muscles helps pump blood upward. Valves (small flaps inside the veins) open to let the blood through, then close to keep it from flowing backward. This in turn allows blood to move against gravity, to return to the heart.
Development of Venous Reflux Disease
Venous disease, which includes spider veins (telangectasias) and the larger varicose veins, is influenced by many factors including heredity, pregnancy, hormonal changes, excessive standing, weight gain and age. Venous disease is very common. Varicose veins, one of the more common forms of venous disease, affects 72% of females and 43% of males by the time they reach the 60-69 years-old.