Varicose veins are a common condition in which enlarged veins are visible through the surface of the skin. They typically look blue or red and can appear swollen, bulging, and twisted. They tend to appear on the legs, usually on the thighs and backs of the calves. Although it is not always possible to prevent varicose veins, understanding your risk factors could help you control your risk. If you have any of the following risk factors and develop varicose veins, a vein specialist in Houston can offer treatments to improve their appearance.
Quick Answer: The main risk factors for varicose veins are older age, being female, pregnancy, a family history of vein disease, excess weight, jobs that involve long hours of standing or sitting, a previous deep vein thrombosis and an inactive lifestyle. Some of these, like genetics and age, cannot be changed. Others, such as weight, activity and how you manage long days on your feet, can be. If you have several risk factors and notice aching, swelling or bulging veins, a duplex ultrasound can show whether vein reflux has started.
Meet your vein specialist
Dr. Syed Raza, MD
Vascular & Interventional Radiology · Founder, Premier Vein & Vascular Center
Fellowship-trained interventional radiologist certified by the American Board of Radiology and the Royal College of Radiologists (UK). Former Chief of Interventional Radiology at UTMB Galveston and Memorial Hermann Memorial City, with 15+ years treating varicose veins, venous reflux and peripheral arterial disease.
Age
Although varicose veins can and do occur in people of all ages, they are much more common in older adults. As you age, wear and tear can weaken the valves in your veins, allowing blood to back up in your blood vessels. This excess blood causes the veins to bulge and swell, leading to varicose veins. According to the US Department of Health and Human Services, about 50 percent of people over 50 have varicose veins. Although you cannot control your age-related risk of varicose veins, lifestyle choices can lower your overall risk of vascular disease.
Obesity
Excess weight puts pressure on your veins, especially those in your legs. This pressure can weaken your veins and cause varicose veins to develop. Being sedentary, which is often associated with obesity, can further increase the risk of varicose veins. Varicose veins are sometimes difficult to diagnose and treat in obese people, because of the depth of the vein, and obese people have a higher risk of complications associated with varicose veins, such as venous ulcers. Treatment by a vein specialist can help obese people avoid these complications.
Gender
Women are significantly more likely to develop varicose veins than men. Doctors speculate that hormonal changes, including those caused by pregnancy, menopause, and taking birth control pills, increase the risk of varicose veins. In most cases, varicose veins that develop during pregnancy resolve themselves within the first three months after delivery.
Varicose Vein Risk Factors at a Glance
Varicose veins develop when the one-way valves inside the leg veins weaken and let blood fall backward, a process called reflux. Each risk factor works by doing one of three things: weakening the vein wall and valves, increasing the pressure inside the leg veins, or reducing the calf muscle pump that pushes blood back toward the heart. Most people who develop varicose veins have more than one of these working together.
The age, weight and gender factors above are some of the most important, but they are only part of the picture. The table below groups the main risk factors by whether you can change them.
| Risk factor | Can it be changed? | How it affects the veins |
|---|---|---|
| Family history | No | Inherited weakness of vein walls and valves |
| Age | No | Valves and vein walls lose elasticity over time |
| Female sex and hormones | Partly (hormone therapy choices) | Estrogen and progesterone relax vein walls |
| Pregnancy | Partly (support during pregnancy) | More blood volume, pelvic vein pressure, hormonal relaxation |
| Previous deep vein thrombosis | No, but further clots can be prevented | Scarring and destruction of deep vein valves |
| Excess body weight | Yes | Raises abdominal and leg vein pressure |
| Prolonged standing or sitting | Yes, with movement breaks and compression | Calf pump stays inactive and blood pools in the legs |
| Inactivity and stiff ankles | Yes | Weak calf muscle pump |
| Smoking | Yes | Damages blood vessel walls and slows healing |
Family History: The Risk Factor People Underestimate
When we take a history, one of the first questions we ask is whether a parent, grandparent or sibling has varicose veins, leg ulcers or has had vein surgery. Family history is one of the strongest predictors we see. If both parents have varicose veins, the chance of developing them is higher still, and they often appear at a younger age, sometimes in the 20s.
What people inherit is not the varicose vein itself but the tissue it is made from: vein walls that stretch more easily and valves that are more prone to failing. That is why siblings often develop veins in a similar pattern even when their lifestyles are very different. Knowing your family history does not mean varicose veins are inevitable, but it is a good reason to pay attention to early symptoms and to protect your legs during high-risk times like pregnancy or a new standing job.
Pregnancy and Hormones as Risk Factors for Varicose Veins
Pregnancy deserves its own section because it stacks several risk factors at once. Blood volume rises considerably to support the baby, hormones relax the smooth muscle in vein walls, and the growing uterus presses on the large veins in the pelvis, slowing drainage from the legs.
Many women first notice varicose veins in a pregnancy, often in the second or third trimester. Veins may also appear on the vulva, which can be uncomfortable but usually improves after delivery. While many pregnancy veins settle after the baby is born, each further pregnancy tends to add strain, and veins that are still present several months after delivery often reflect lasting valve damage.
Outside pregnancy, birth control pills and hormone replacement therapy can also influence vein symptoms. They are not usually a reason on their own to stop a needed medication, but they are worth mentioning to your vein specialist, especially if you have had a blood clot before.
Standing and Sitting Jobs
Your job may matter more than you think. When you stand still, the full weight of the column of blood from your heart to your feet presses on the valves in your lower legs. When you sit for hours, the calf muscle is barely working, so blood moves slowly and pools. Either way, the veins spend most of the day under higher pressure.
Patients we see with this risk factor often include nurses and other hospital staff, teachers, hair stylists, retail and restaurant workers, security guards, factory workers, truck drivers and office workers who rarely leave their desk. Long commutes in Houston traffic can add to the problem by keeping people seated for even longer stretches.
Simple changes that help
- Take a two to three minute walk every 30 to 60 minutes
- Do calf raises and ankle circles while standing at a counter or sitting at a desk
- Shift your weight and move your feet rather than locking your knees
- Wear graduated compression stockings during long shifts
- Raise your legs for 15 to 20 minutes when you get home
Previous Blood Clots and Leg Injuries
A deep vein thrombosis can leave the deep veins scarred and their valves damaged, even once the clot has dissolved. This raises pressure in the whole venous system of that leg and can lead to swelling, heaviness, skin changes and secondary varicose veins, a pattern known as post-thrombotic syndrome. Major leg fractures, knee or hip surgery and long periods of immobility can raise the risk of clots and, indirectly, of later vein problems.
If you have had a clot, it is important to tell any vein specialist before treatment. It changes which tests we perform, how we interpret the ultrasound and which treatments are safest.
Which Risk Factors Raise the Chance of Complications?
Having varicose veins is one thing; developing complications from them is another. Some people live with mild veins for decades, while others progress to swelling, skin damage and ulcers. Factors that make complications more likely include:
- Long-standing varicose veins that have never been evaluated
- A previous deep vein thrombosis
- Obesity and limited mobility
- Older age combined with diabetes or heart failure
- Ankle swelling that is present most days
- Brown staining, itching or hardening of the skin around the ankles
These skin changes are a sign of chronic venous insufficiency and are a strong reason to be seen sooner rather than later. Treating the underlying reflux before the skin breaks down is simpler, more comfortable and has a quicker recovery than healing an open wound.
How We Evaluate Your Vein Risk
At Premier Vein and Vascular Center, an evaluation is not just about the veins you can see. It is about finding out whether reflux is present, where it starts and how far it has progressed.
- Focused history. We review your symptoms, family history, pregnancies, job, medications, hormone use, previous clots and any past vein treatment.
- Standing examination. We examine your legs upright, look for bulging veins, swelling and skin changes, and check the pulses in your feet.
- Venous duplex ultrasound. A painless venous ultrasound in our IAC-accredited vascular lab measures reflux in the superficial and deep veins and rules out clots.
- A clear plan. We explain whether treatment is needed now, what can wait, and what you can do to lower your risk of progression.
Lowering Your Risk and Treating Veins Early
You cannot change your genes, but you can change how much pressure your veins work against every day. Staying active, keeping a healthy weight, avoiding smoking, breaking up long periods of sitting or standing and using compression at high-risk times all make a real difference to symptoms and may slow the appearance of new veins.
Once a valve has failed, though, lifestyle changes cannot repair it. That is where minimally invasive treatment comes in. Depending on the ultrasound findings, options include radiofrequency ablation or other endovenous procedures to close the leaking main vein, foam sclerotherapy for branch veins and phlebectomy for large surface veins. These are done in the office under local anesthesia, and most patients walk out and return to light activity the same day. You can read more on our varicose vein treatment page.
A quick self-check at home
At the end of a long day, stand in front of a mirror in good light and look at the backs of your calves, the inner thighs and around your ankles. Note any bulging or rope-like veins, clusters of fine spider veins, sock marks that stay for a while after you take your socks off, or areas of brown or reddish skin. Then ask yourself whether your legs feel heavy, achy, restless or crampy at night, and whether raising them makes them feel better. If you answer yes to several of these and have one or more of the risk factors above, that is a good reason to book a vein evaluation rather than wait.
Seek urgent medical care if you notice:
- Sudden swelling, pain and warmth in one leg, which may be a deep vein thrombosis
- Chest pain, shortness of breath or coughing up blood
- Bleeding from a varicose vein that does not stop with firm pressure and leg elevation
- A red, hot, very tender cord along a vein, especially with fever
When to See a Vein Specialist in Houston
If you have several of the risk factors above and your legs ache, feel heavy, swell by evening or show bulging veins, it is a good time for a check. The same is true if you have a strong family history and are planning a pregnancy, or if you have had a clot in the past. Dr. Syed Raza, a fellowship-trained interventional radiologist with more than 15 years of experience treating venous reflux, leads our team at our Houston vein clinic. We serve patients from Houston, Katy and across the region, accept most insurance plans including Medicare, and can usually offer an appointment the same week.
Talk With a Specialist at Premier Vein
Have questions about your symptoms or treatment options? Dr. Syed Raza and the team at Premier Vein & Vascular Center can evaluate your concerns and explain your options clearly. Same-week appointments are usually available, and most insurance plans are accepted.
Frequently Asked Questions
Who is most at risk for varicose veins?
People with a family history of varicose veins, women, those who have been pregnant, adults over 50, people carrying extra weight and anyone who stands or sits for long hours are at the highest risk. A previous deep vein thrombosis also raises the risk.
Can young people get varicose veins?
Yes. Varicose veins are more common with age, but people with a strong family history can develop them in their 20s or 30s. Pregnancy and standing jobs often bring them out earlier.
Does exercise lower the risk of varicose veins?
Regular walking, cycling and swimming strengthen the calf muscle pump, which helps move blood out of the legs. Exercise cannot fix a valve that has already failed, but it can ease symptoms and support overall vein health.
Do compression stockings prevent varicose veins?
Compression stockings reduce swelling and ease aching by supporting the veins, and they are useful during pregnancy, long shifts and travel. There is limited evidence that they prevent varicose veins entirely, but they can help slow symptoms.
Is it worth getting checked if I have risk factors but no symptoms?
Most people without symptoms or visible veins do not need testing. If you have risk factors plus aching, swelling, skin changes or bulging veins, a vein evaluation and duplex ultrasound can detect reflux early.
Will losing weight make my varicose veins go away?
Losing weight lowers pressure on the leg veins and often reduces aching and swelling, but it does not usually make existing varicose veins disappear. Treatment of the leaking vein is needed to remove them.
Is standing or sitting worse for varicose veins?
Both keep the calf muscle pump inactive and let blood pool in the lower legs, so neither is ideal for long periods. The key is regular movement: short walks, calf raises and changing position every 30 to 60 minutes help whichever one your job requires.
Trusted Health Resources
- Chronic Venous Insufficiency, Society for Vascular Surgery
- Venous Insufficiency, MedlinePlus Medical Encyclopedia (NIH)
- Varicose Veins and Spider Veins, MedlinePlus (NIH)