Spider Veins During Pregnancy: Causes, Prevention & What to Expect | VEIN + SKIN Sydney
Spider veins during pregnancy are extremely common. Learn why they develop, where they appear, how to manage symptoms safely, and when to seek professional assessment.
Spider Veins During Pregnancy: A Common Change for Many Women
If you’ve noticed small red, blue, or purple veins appearing on your legs during pregnancy, you’re not alone — and you haven’t done anything wrong.
Spider veins are one of the most common vascular changes women experience during pregnancy. Research suggests that when all types of visible vein changes are included, the prevalence during pregnancy can be as high as 70%.
Understanding why they develop, what to watch for, and how to manage them is the most useful thing you can do during this period.
Why Do Spider Veins Develop During Pregnancy?
Pregnancy creates a specific set of physiological conditions that place considerable strain on the venous system.
Increased Blood Volume
During pregnancy, the body produces significantly more blood — up to 50% more — to support the growing baby. The veins, however, do not expand to match this increase. The added pressure stretches vein walls and stresses the small valves inside them that keep blood flowing in one direction.
Hormonal Changes
Higher levels of progesterone during pregnancy relax the smooth muscle in blood vessel walls. This hormonal effect weakens the structural integrity of the veins, making it easier for blood to flow backward and pool — one of the key mechanisms behind both spider veins and varicose veins.
Pressure from the Growing Uterus
As the baby grows, the uterus places increasing pressure on the inferior vena cava — the large vein responsible for returning blood from the lower body to the heart.
This compression makes it harder for blood to travel upward from the legs, contributing to pooling, swelling, and visible veins, particularly during the second and third trimesters.
Family History
Genetics also play a significant role. If your mother or grandmother experienced spider veins or varicose veins during pregnancy, your likelihood of developing them is higher.
Where Do Pregnancy Spider Veins Typically Appear?
Spider veins during pregnancy most commonly develop on:
- The legs — calves, ankles, thighs, and behind the knees
- The face — fine red capillaries around the nose and cheeks
- The chest and breasts — superficial vessels that become more visible as blood volume rises
Spider veins are thin red, blue, or purple vessels visible beneath the skin. Unlike varicose veins, they do not bulge or feel lumpy.
What Is the Difference Between Spider Veins and Varicose Veins?
Although the two conditions share similar causes, they are different.
Spider Veins
Spider veins are small, flat, web-like vessels visible just beneath the skin surface. They are primarily a cosmetic concern.
Varicose Veins
Varicose veins are larger, raised, rope-like vessels that bulge above the skin surface. They are more likely to cause symptoms such as aching, heaviness, throbbing, swelling, and discomfort.
Both are common during pregnancy and are influenced by the same physiological changes.
Can You Prevent Spider Veins During Pregnancy?
There is no guaranteed way to prevent spider veins during pregnancy. However, several measures may help support healthy circulation and reduce symptom severity.
Wear Compression Stockings
Medical-grade graduated compression stockings are considered one of the most effective conservative measures for vein health during pregnancy.
They help improve blood flow back toward the heart, reduce swelling, and minimise blood pooling in the legs.
Stay Active
Regular walking, swimming, and gentle exercise help support circulation and reduce venous pressure.
Avoid Prolonged Sitting or Standing
Remaining in one position for extended periods allows blood to pool in the legs. Changing position regularly and taking short walks can help maintain circulation.
Elevate Your Legs
Raising your legs above heart level for 15–30 minutes several times per day may reduce swelling and discomfort.
Sleep on Your Left Side
Sleeping on your left side can reduce pressure on the major veins in the abdomen and improve blood return from the legs.
Avoid Excessive Heat
Hot baths, saunas, and prolonged heat exposure can cause blood vessels to dilate and may worsen vein symptoms.
Can Spider Veins Be Treated During Pregnancy?
Active vein treatment is generally not recommended during pregnancy.
Because hormone levels, blood volume, and venous pressure are constantly changing, treatment performed during pregnancy may not reflect the final appearance of the veins after delivery.
The focus during pregnancy should be on symptom management and supporting healthy circulation.
When Should You Seek Assessment During Pregnancy?
Spider veins themselves are usually harmless. However, certain symptoms should be assessed by a healthcare professional.
Seek medical advice if you experience:
- Significant swelling, especially if one leg is more swollen than the other
- Persistent aching, heaviness, or throbbing
- Pain, redness, warmth, or hardness over a vein
- Sudden worsening of symptoms
- Skin changes around the ankles
- Calf pain accompanied by swelling or warmth
Pregnancy increases the risk of deep vein thrombosis (DVT). While spider veins do not cause DVT, symptoms suggestive of a blood clot require prompt medical assessment.
If you are concerned about your vein health during pregnancy, a vascular assessment can help determine whether your symptoms are consistent with normal pregnancy-related changes or whether further investigation is required.
Will Pregnancy Spider Veins Disappear After Delivery?
Some spider veins improve naturally after pregnancy as hormone levels normalise and blood volume returns to pre-pregnancy levels.
However, not all veins disappear completely.
Veins that remain visible several months after delivery are less likely to resolve on their own. Each subsequent pregnancy also tends to place additional strain on the venous system, which may make vein changes more noticeable over time.
Treatment After Pregnancy
Once pregnancy and breastfeeding are complete and the body has stabilised, treatment options can be considered for persistent spider veins.
At VEIN + SKIN, we use the Excel V+, a leading medical-grade vascular laser designed to target unwanted blood vessels with precision while minimising impact on surrounding skin.
Treatment suitability is assessed individually, and vascular assessment is available when clinically indicated.
Frequently Asked Questions
Are spider veins during pregnancy dangerous?
Spider veins themselves are generally harmless. However, significant swelling, pain, redness, warmth, or symptoms affecting only one leg should be assessed promptly.
When do pregnancy spider veins usually appear?
They can develop at any stage of pregnancy but are most common during the second and third trimesters.
Can I wear compression stockings throughout pregnancy?
Yes. Medical-grade compression stockings are considered safe throughout pregnancy and are widely recommended to support circulation.
Will spider veins get worse with each pregnancy?
In many cases, yes. Each pregnancy places additional stress on the venous system, making existing vein changes more likely to progress.
When can I treat spider veins after pregnancy?
Treatment is generally considered after delivery and once breastfeeding has been completed, allowing hormones and circulation to stabilise.
The Bottom Line
Spider veins during pregnancy are extremely common and result from normal physiological changes that support a growing baby.
While they can be frustrating, the focus during pregnancy should be on symptom management and maintaining healthy circulation.
Many veins improve naturally after delivery. If they persist, effective treatment options are available once your body has fully recovered.
About VEIN + SKIN
VEIN + SKIN is a specialised vascular aesthetics clinic located within North Shore Private Hospital, St Leonards, Sydney.
Unlike many cosmetic clinics, we focus on both the appearance and health of your veins.
A vascular surgeon is available on-site through our specialist vascular practice, and vascular ultrasound assessments can be arranged when clinically indicated. For patients with a valid GP referral, ultrasound examinations may be bulk billed and are performed by highly experienced vascular sonographers who specialise exclusively in vascular imaging.
We use the Excel V+, one of the world’s leading vascular laser systems, to treat spider veins, facial veins, broken capillaries, rosacea-related redness, cherry angiomas, and other vascular skin concerns.
