Risk factors

These factors increase your risk of developing varicose veins:

• Age. The risk of varicose veins increases with age. Aging causes wear and tear on the valves in your veins that help regulate blood flow. Eventually, that wear causes the valves to allow some blood to flow back into your veins where it collects instead of flowing up to your heart.
• Sex. Women are more likely to develop the condition. Hormonal changes before your period or during pregnancy or menopause might be a factor because female hormones tend to relax vein walls. Hormone treatments, such as birth control pills, might increase your risk of varicose veins.
• Pregnancy. During pregnancy, the volume of blood in your body increases. This change supports the growing fetus, but also can produce an unfortunate side effect — enlarged veins in your legs. Hormonal changes during pregnancy may also play a role.
• Family history. If other family members had varicose veins, there's a greater chance you will too.
• Obesity. Being overweight puts added pressure on your veins.
• Standing or sitting for long periods of time. Your blood doesn't flow as well if you're in the same position for long periods.