If you are pregnant and wondering about treatment for varicose veins in Houston, you may be wondering why you developed this condition. When you are pregnant, your body has more blood than it does normally. Watch this video to learn why pregnancy can lead to varicose and spider veins.
Quick Answer: Pregnancy causes spider and varicose veins through a combination of changes: blood volume rises sharply, the hormone progesterone relaxes the walls of the veins, and the growing uterus presses on the large veins in the pelvis, slowing blood return from the legs. Together these stretch the veins and strain their one-way valves. Many pregnancy veins shrink within a few months after delivery, but veins that remain, keep aching or return with each pregnancy usually reflect valve damage that can be diagnosed with ultrasound and treated after you have finished breastfeeding.
The extra blood coursing through your circulatory system during pregnancy puts added pressure on your veins. As you progress through your pregnancy, your body can respond by creating new veins and making its existing ones bigger. The result is typically the appearance of spider veins and varicose veins, which can be treated with vein treatment. You can help prevent these veins from developing by staying off of your feet as much as possible, particularly during your third trimester, and by wearing compression socks.
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.
Why Pregnancy Causes Spider and Varicose Veins
Leg veins carry blood uphill, back to the heart, against gravity. They rely on thin one-way valves and on the squeeze of the calf muscles every time you walk. Pregnancy puts pressure on that system from several directions at once, which is why so many women first notice bulging or web-like veins while expecting.
Hormones relax the vein walls
Progesterone rises steadily through pregnancy. One of its jobs is to relax smooth muscle, which helps the uterus grow, but vein walls contain smooth muscle too. As the walls soften and widen, the edges of the valves no longer meet as snugly. Even a small gap lets blood slip backward, which doctors call reflux.
The uterus presses on the pelvic veins
From the second trimester on, the growing uterus sits on top of the iliac veins and the inferior vena cava, the main channels draining both legs. That pressure slows the return of blood and raises the pressure in every vein below it. It is also why swelling and vein symptoms often feel worse on the left side, where the left iliac vein naturally runs under an artery and is more easily compressed.
More blood to move
The extra blood volume your body produces is essential for the baby, but it means the leg veins are carrying more fluid under higher pressure. Combine that with less activity in late pregnancy, and blood pools more easily in the lower legs.
Who Is Most Likely to Develop Pregnancy Varicose Veins?
Not every pregnant woman develops visible veins. In our practice, the women who are most affected usually have one or more of these factors:
- A family history of varicose veins, especially in a mother or sister, which points to inherited weakness in the vein walls or valves
- Second, third or later pregnancies, because each pregnancy can add to valve damage left over from the last
- Twins or multiples, which mean a larger uterus and more blood volume
- Jobs that involve long hours of standing, such as nursing, teaching or retail
- Higher body weight before or during pregnancy
- Existing spider or varicose veins before pregnancy, which often enlarge
Spider Veins vs Varicose Veins in Pregnancy
Both can appear during pregnancy, but they behave differently and carry different implications.
| Feature | Spider veins | Varicose veins | Vulvar or pelvic varicose veins |
|---|---|---|---|
| Appearance | Fine red, blue or purple lines and webs, flat to the skin | Raised, twisted, rope-like veins, usually on the calves or thighs | Swollen veins on the labia, upper inner thigh or buttock |
| Typical symptoms | Usually none; sometimes mild itching or burning | Aching, heaviness, swelling, cramping, itching | Pelvic heaviness, fullness or pain that worsens when standing |
| After delivery | Often fade, though some persist | Often shrink but may not disappear, especially after several pregnancies | Usually improve within weeks to months after delivery |
| What it suggests | Mostly cosmetic, sometimes a sign of reflux nearby | Valve failure in the leg veins (venous insufficiency) | Pelvic vein reflux, which can continue after pregnancy |
Spider veins on the face, neck and chest are also common in pregnancy and are driven largely by hormones. Leg varicose veins are a different matter, because they signal that the valves are not doing their job.
Will Pregnancy Varicose Veins Go Away After Delivery?
Often they improve a great deal. Once the baby is born, blood volume returns to normal, progesterone levels fall and the uterus no longer presses on the pelvic veins. Many women see their veins shrink noticeably over the first three to six months postpartum.
Whether they disappear completely depends on how much the valves were damaged. If veins are still visible, aching or causing swelling a year after delivery, they are unlikely to go away on their own. Veins also tend to come back larger with each subsequent pregnancy, because each one adds strain to valves that are already weakened.
For that reason we generally suggest waiting until after delivery and after breastfeeding before deciding on treatment. That gives the body time to recover and shows us which veins are truly diseased.
Easing Vein Symptoms Safely While You Are Pregnant
Staying off your feet and wearing compression, as described above, are the two most useful steps. A few more habits help the calf muscle pump and reduce pooling:
- Sleep and rest on your left side when you can. This takes some of the weight of the uterus off the vena cava, which runs on the right.
- Walk daily, even for short periods. Walking activates the calf muscles that push blood upward.
- Raise your feet on a stool or pillows when sitting, and avoid crossing your legs for long periods.
- Do ankle pumps and gentle calf raises during long car rides or desk work.
- Choose properly fitted compression. Ask your obstetrician or vein specialist which strength suits you; maternity styles are available.
- Stay hydrated and keep active within your doctor’s guidance, which supports healthy circulation in the Houston heat.
Vein procedures such as ablation and sclerotherapy are generally postponed during pregnancy. Compression and the habits above are the mainstay until after the baby arrives.
Other Vein-Related Changes During Pregnancy
Leg veins are not the only veins that react to pregnancy. Patients often ask us whether other symptoms they are noticing are connected, and in many cases they are, because the same hormones and pelvic pressure are at work.
Hemorrhoids
Hemorrhoids are swollen veins in the lower rectum and anus. Pressure from the uterus, constipation and straining during delivery make them very common in pregnancy and just after. Most settle with fiber, fluids and simple care. Hemorrhoids that keep bleeding long after pregnancy can be evaluated, and some patients are candidates for minimally invasive hemorrhoid embolization.
Night cramps and restless legs
Calf cramps at night and an urge to move the legs in the evening are both frequent in the second half of pregnancy. Pooling of blood in the lower legs can contribute, along with changes in minerals and circulation. Gentle calf stretches before bed, staying hydrated and keeping the legs elevated in the evening often help. If cramps or leg cramping continue after delivery together with aching, visible veins, underlying venous insufficiency may be part of the cause.
Ankle swelling and skin changes
Mild, even ankle swelling late in pregnancy is expected. Swelling that persists months after delivery, along with brown discoloration, itching or thickened skin near the ankles, is not part of normal recovery. These are signs that vein pressure has stayed high and deserve an ultrasound.
Pregnancy, Blood Clots and Warning Signs
Pregnancy and the first weeks after delivery are a time of naturally higher clotting risk. The body does this deliberately to limit bleeding at birth, but it also makes clots in the leg veins more likely. A deep vein thrombosis is not the same as varicose veins, but having varicose veins, being less mobile and having a cesarean delivery can all add to the risk.
Call 911 or seek emergency care if you notice:
- Swelling, pain or tenderness in one calf or thigh, especially if it is much worse than the other leg
- Sudden shortness of breath, chest pain or a racing heartbeat
- Coughing up blood
- A hot, red, hard and painful varicose vein that keeps spreading
- Bleeding from a varicose vein that does not stop with firm pressure and leg elevation
Normal pregnancy swelling usually affects both ankles fairly evenly and improves overnight. Swelling of one leg, or sudden swelling of the face and hands with headache or vision changes, needs prompt medical attention.
How We Evaluate Veins After Pregnancy
When a patient comes to Premier Vein & Vascular Center with veins that appeared or worsened during pregnancy, the visit follows a clear sequence.
- Focused history. We ask how many pregnancies you have had, when the veins appeared, whether they improved after delivery, what symptoms you have, and whether you have had clots, pelvic pain or a family history of vein disease.
- Examination. We look at the legs standing up, where veins are easiest to see, and check for swelling, skin changes and any vulvar or upper thigh veins that suggest a pelvic source.
- Venous duplex ultrasound. A venous ultrasound in our IAC-accredited vascular lab maps which valves are leaking and how much blood is flowing backward. If pelvic veins are suspected, further imaging may be recommended.
- A clear plan. We explain what the scan shows, whether the veins are cosmetic or medical, which treatments fit, and how to time them around breastfeeding or plans for another pregnancy.
Treatment Options Once You Have Delivered
Modern vein treatment is done in the office, usually under local anesthesia, with a quick return to normal routines, which matters when you are caring for a young child.
- Ablation of the main leaking vein. When ultrasound shows reflux in the great or small saphenous vein, endovenous thermal ablation or non-thermal closure seals it from the inside. Blood reroutes through healthy veins.
- Removal or closure of bulging branches. Ambulatory phlebectomy or foam sclerotherapy treats the visible varicose veins that remain.
- Sclerotherapy for spider veins. Sclerotherapy is the standard treatment for spider veins and small reticular veins. It is usually deferred until after breastfeeding.
- Pelvic vein evaluation. Ongoing pelvic heaviness, pain after intercourse or vulvar veins can point to pelvic congestion syndrome, which interventional radiologists can treat with vein embolization.
If you plan more children, we discuss whether to treat now or wait. Treating symptomatic reflux between pregnancies is reasonable for many women, but new veins can still develop with later pregnancies.
When to See a Vein Specialist in Houston After Pregnancy
It is worth booking an evaluation if your veins are still visible or uncomfortable several months after delivery and breastfeeding, if they ache, swell or itch, if they got noticeably worse with each pregnancy, or if you notice skin darkening around the ankles. Women in Houston, Katy and the surrounding communities can see Dr. Syed Raza, a fellowship-trained interventional radiologist with more than 15 years of experience treating varicose veins and venous reflux, at our vein clinic in Houston. Same-week appointments are usually available, and most insurance plans, including Medicare, are accepted for medically necessary care.
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
Are varicose veins during pregnancy dangerous?
Most pregnancy varicose veins are uncomfortable but not dangerous. However, pregnancy raises clotting risk, so a hot, hard, painful vein or swelling of one leg should be checked promptly with an ultrasound to rule out a blood clot.
Can I get vein treatment while pregnant?
Vein procedures such as ablation and sclerotherapy are generally postponed until after delivery and breastfeeding. During pregnancy, compression stockings, walking, leg elevation and sleeping on your left side are the safest ways to manage symptoms.
How long after pregnancy should I wait before treating varicose veins?
Many specialists suggest waiting at least three to six months after delivery, and until you have finished breastfeeding. This allows veins to shrink naturally and shows which ones are truly diseased and need treatment.
Why are my varicose veins worse with each pregnancy?
Each pregnancy adds hormonal relaxation, higher blood volume and pelvic pressure to valves that may already be weakened. Valve damage tends to accumulate, so veins often appear earlier and larger with later pregnancies.
Do compression stockings prevent varicose veins in pregnancy?
Compression stockings can reduce swelling, aching and the progression of varicose veins during pregnancy, but they cannot always prevent them, especially with a strong family history. They work best when put on in the morning before swelling builds.
What are vulvar varicose veins?
Vulvar varicose veins are swollen veins on the labia or upper inner thigh caused by increased pelvic vein pressure during pregnancy. They usually improve after delivery, but if they persist they may be a sign of pelvic vein reflux that can be evaluated by a vein specialist.
Can varicose veins cause cramps during pregnancy?
Yes, pooling of blood in the leg veins can contribute to aching and night cramps in pregnancy, along with other factors such as mineral balance and fatigue. Walking during the day, calf stretches before bed and leg elevation often help, and persistent symptoms after delivery are worth checking.
Trusted Health Resources
- Chronic Venous Insufficiency, Society for Vascular Surgery
- Venous Insufficiency, MedlinePlus Medical Encyclopedia (NIH)
- Varicose Veins and Spider Veins, MedlinePlus (NIH)
