The cause of varicose veins is a weakening of one-way valves within the veins. When these valves weaken, blood can leak back in the vein and collect there and enlarge the vein. Risk factors, while not a direct cause of varicose veins, can increase a person's chances of developing them. These risk factors for varicose veins include increased age, a family history of vein problems, obesity, and pregnancy.
Cause of Varicose Veins: An Overview
The cause of
varicose veins is weakening of the valves within the veins. To understand this, it may be helpful to understand what veins do.
Veins are a type of blood vessel. They are responsible for carrrying blood from the body back to the heart. To make sure that blood gets back to the heart, veins have valves that act as one-way flaps. These valves prevent the blood from flowing backwards. If the one-way valves become weak, blood can leak back into the vein and collect there. This problem is called venous insufficiency. Pooled blood enlarges the vein and it becomes a varicose vein.
Cause of Varicose Veins: Know the Risk Factors
While not a cause of varicose veins, there are a number of factors that increase a person's chances for developing weakened valves. These are known as varicose vein risk factors. The more risk factors a person has, the greater their chances for developing the condition.
Risk factors for varicose veins include:
- Increasing age.
- Having family members with vein problems or being born with weak vein valves.
- Hormonal changes. These occur during puberty, pregnancy, and menopause. Taking birth control pills and other medicines containing estrogen and progesterone also increase the risk of varicose veins.
- Pregnancy. During pregnancy, there is a huge increase in the amount of blood in the body, which can cause veins to enlarge. The expanding uterus also puts pressure on the veins. Varicose veins usually improve within 3 months after delivery. A growing number of abnormal veins usually appear with each additional pregnancy.
- Obesity, leg injury, prolonged standing, and other things that weaken vein valves.
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