Small, one-way valves in veins ensure blood only flows towards the heart. In some people, these valves become weakened and blood collects in the veins, causing them to abnormally enlarge.
Varicose veins are most common on the legs, because leg veins must work against gravity. Standing increases pressure on leg veins.
- Hormonal changes during pregnancy and menopause.
- Being overweight increases the pressure on veins.
- Prolonged sitting or standing restricts circuluation and puts added pressure on veins.
- Chronic constipation
- Genetics
- Aging
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