Deep Vein Thrombosis in Pregnancy: Risks, Signs, and What You Need to Know
When you're pregnant, your body changes in ways you can’t always predict. One of the most serious risks is deep vein thrombosis, a blood clot that forms in a deep vein, usually in the leg. Also known as DVT, it’s not common—but during pregnancy, your risk goes up by 4 to 5 times compared to when you’re not pregnant. This isn’t just about discomfort. If the clot breaks loose, it can travel to your lungs and cause a life-threatening pulmonary embolism. That’s why knowing the signs and understanding your risk matters.
Why does this happen? During pregnancy, your blood naturally becomes thicker to help prevent excessive bleeding during delivery. On top of that, your growing uterus puts pressure on the large veins in your pelvis, slowing blood flow. Hormones like progesterone relax blood vessel walls, making clots more likely. These changes are normal—but when combined, they create the perfect conditions for venous thromboembolism, the umbrella term for DVT and pulmonary embolism. Women with a family history of clots, those over 35, or those carrying multiples are at even higher risk. Even bed rest after a C-section or long flights can tip the balance.
What should you watch for? Swelling in one leg—especially if it’s sudden—is the biggest red flag. You might feel warmth, redness, or a dull ache that doesn’t go away with rest. Pain that feels like a cramp but gets worse when you stand or walk is another sign. If you’re short of breath, dizzy, or have chest pain, don’t wait—get help immediately. These could mean the clot has moved to your lungs. Most cases of DVT in pregnancy are caught early because doctors screen high-risk patients. If you’re at risk, your provider might recommend compression stockings or even low-dose blood thinners like heparin, which are safe during pregnancy and don’t cross the placenta.
What you won’t find in every post below is a one-size-fits-all answer. Some stories share how women noticed symptoms after a long car ride. Others describe the anxiety of being told they need daily injections. A few talk about how their doctors adjusted their care plan after a previous clot. You’ll see real experiences, not just textbook definitions. This isn’t about scaring you—it’s about giving you the tools to recognize danger early, ask the right questions, and work with your care team to stay safe. Whether you’re in your first trimester or weeks away from delivery, understanding deep vein thrombosis in pregnancy can make all the difference.
- By Percival Harrington
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- 18 Nov 2025
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