Varicose veins during pregnancy

By trimester

Weeks 1–13

1st trimester

Varicose veins are less common this early, since blood volume hasn't expanded much yet, though small spider veins or a family history flare can still show up. If your job keeps you on your feet, this is a good time to start swapping positions often and propping your feet up in the evening, before symptoms build.

Weeks 14–27

2nd trimester

Rising blood volume and a growing uterus pressing on pelvic veins often bring visible varicose veins into view now, especially behind the knee or along the inner calf. Putting on compression stockings first thing in the morning, before any swelling sets in, works better than reaching for them later in the day.

Weeks 28–birth

3rd trimester

Varicose veins are usually largest and most uncomfortable now, from the combined weight of the uterus and pregnancy's extra blood volume. Short walking breaks, side-lying rest with your feet propped up, and switching between sitting and standing every hour or so all take pressure off your legs. New swelling, pain, or warmth in just one leg is a different pattern, and it deserves a same-day call to your healthcare provider.

What does the evidence show for varicose veins?

• Being pregnant is enough on its own to raise pressure inside your leg veins and bring on varicose veins, right alongside extra weight, older age, and long stretches of standing or sitting. 1
• Doctors reach for simple habits first: skip long stretches of standing still, prop the leg up, keep moving, and add a compression stocking, before anything more involved. 2
• Staying still for a long stretch, like a flight past four hours or days of bed rest, slows blood flow enough to raise clot risk on its own, which is exactly why getting up to move is more than comfort advice. 3
• A real blood clot looks different from an ordinary varicose vein: it shows up as a leg that's swollen, tender, and painful to the touch, almost always in just one leg rather than both. 4
• Pregnancy alone makes a blood clot more than five times as likely as when you're not pregnant, and that higher risk sticks around for the first six weeks after delivery too. 5
• DVT in pregnancy is most often unilateral (usually one leg, more often the left), causing swelling, warmth, redness, and calf tenderness, and a calf circumference more than 2 centimeters larger than the other leg is a recognized diagnostic clue. 6

When should I call my provider about varicose veins?

A blood clot tends to look different from an ordinary varicose vein: swelling, warmth, redness, and calf tenderness in just one leg, most often the left, rather than the gradual, symmetric puffiness of typical pregnancy edema. A calf that measures more than 2 centimeters larger around than the other leg is a recognized warning sign. Pregnancy alone raises clot risk, and sitting still for more than about four hours, like on a long flight, or being on bed rest adds to it, so new one-sided leg symptoms deserve a same-day call to your healthcare provider rather than a wait-and-see approach. None of these lists replace your own judgment: if this symptom worries you, that on its own is enough reason to check in with your healthcare provider.