Top Causes of Varicose Veins

Published February 6th, 2026 by Elite Veins New York

Varicose veins do not show up out of nowhere, even if it feels that way sometimes. There are usually a few overlapping reasons behind them, and most people have more than one factor in play. Genetics, body weight, pregnancy, gender, and daily habits all tend to mix over time. If you have ever talked with NYC vein treatment specialists, this is usually where the conversation starts.

Understanding these causes helps set expectations, which matters more than people think. It gives you a clearer picture of what you can change and what you cannot. Some causes are baked in early, quietly. Others develop slowly, maybe without you noticing day to day.

Genetics

Genetics has a strong influence on whether varicose veins develop, even if someone lives a fairly active life. If weak vein walls or valves run in your family, you may notice vein changes earlier than expected. Blood has a harder time moving upward, and it starts to collect where it should not. Over time, that pressure stretches veins, making them visible.

Knowing your family history can be helpful, even if it feels a bit abstract. It gives context to symptoms that might otherwise seem random. Some people notice veins forming in their twenties, which surprises them. Genetics often explains why.

Obesity

Carrying extra weight adds steady pressure to the veins, especially in the legs. That pressure makes it harder for blood to return to the heart. Over time, veins can stretch and lose their ability to move blood efficiently. It happens slowly, which is why people often connect the dots later.

There is also a lifestyle piece tied in here. Weight gain often goes hand in hand with less movement, just a bit less walking and a bit more sitting. Circulation slows down, and veins take the hit. Small changes can help, but the strain itself still matters.

Pregnancy

Pregnancy places unique stress on the veins, and it is not just from weight gain. As the uterus grows, it presses against prominent veins that return blood from the legs. That pressure slows circulation and causes blood to back up. Veins respond by stretching, sometimes permanently.

Hormones also play a role during pregnancy, even if it is not obvious. They relax vein walls, increasing the likelihood of swelling. Many people notice improvement after delivery, but not always a complete reversal. It depends on the person and their vein health before pregnancy.

Gender

Gender influences varicose vein risk more than most people expect. Women tend to develop them more often, mainly due to hormonal shifts over time. Estrogen can weaken vein walls and valves, especially during pregnancy or menopause. Birth control can have a similar effect for some people.

Men are not immune, though. They may develop varicose veins later or ignore symptoms longer. The difference is not about severity as much as timing and triggers. Hormones quietly shape how veins respond to pressure.

Sedentary Lifestyle

A sedentary lifestyle affects the veins in a very practical way. Muscles help push blood upward, and when they are not used, circulation slows down. Sitting or standing for long stretches lets blood pool in the legs. That pressure adds up.

Over time, veins lose elasticity and struggle to regain their elasticity. Inactivity can also contribute to weight gain, which adds to more stress. Movement does not have to be intense to help. Even small, regular motion keeps blood flowing and veins working better.