Elevating your legs during pregnancy works best in 15- to 20-minute sessions, repeated a few times throughout the day. There’s no need to hold the position for an hour straight. Short, consistent intervals are effective at reducing the swelling that most pregnant people experience, especially in the second and third trimesters.
How Long and How Often to Elevate
UT Southwestern Medical Center recommends elevating your legs above heart level in 15- to 20-minute intervals, a few times a day. You can do this while reading, watching TV, or resting. Three to four sessions spread across the day is a reasonable target, though even one or two sessions will provide some relief if that’s all your schedule allows.
Swelling tends to be worse later in the day, after hours of standing or sitting upright. An evening session before bed can be especially helpful for draining fluid that has pooled in your legs and ankles throughout the day. But if you notice puffiness first thing in the morning, adding a session earlier can help too.
How High to Raise Your Legs
The goal is to get your feet and ankles above the level of your heart. When you’re reclined on a couch or bed, stacking two or three pillows under your calves and feet usually does the job. You don’t need to be perfectly precise. The basic idea is that gravity pulls fluid downward all day long, and reversing that angle, even modestly, helps fluid drain back toward your core.
What’s happening inside your body: when your legs are raised, blood that has been sitting in the veins of your lower legs flows back toward your heart more easily. This “auto-fluid challenge” increases the volume of blood returning to your central circulation, temporarily boosting how efficiently your heart pumps. In pregnancy, when blood volume is already significantly higher than normal, this simple shift can meaningfully reduce the pressure that causes visible swelling.
Positioning Safely After 24 Weeks
Lying flat on your back becomes risky as your pregnancy progresses. After about 24 weeks, the weight of your growing uterus can compress the large vein (the inferior vena cava) that carries blood from your lower body back to your heart. This can cause a drop in blood pressure, dizziness, nausea, sweating, and a racing heart. Symptoms typically show up within 3 to 10 minutes of lying flat and can, in severe cases, cause loss of consciousness.
The fix is simple: tilt your body to the left. Placing a wedge cushion or a folded pillow under your right hip creates at least a 30-degree left pelvic tilt, which shifts the uterus off the vein. You can still elevate your legs with pillows while lying on your left side or in this tilted-back position. If you ever feel lightheaded or clammy while on your back, roll onto your left side. Symptoms resolve quickly once you change position.
What Else Helps Alongside Elevation
Leg elevation and compression stockings are the two most common treatments for pregnancy-related leg swelling. They work through complementary mechanisms: elevation uses gravity to move fluid centrally, while compression stockings apply steady external pressure that keeps fluid from pooling in the first place. Wearing graduated compression stockings during the day and elevating your legs when you rest is a practical combination.
Staying active also matters. Walking, swimming, and water-based exercises help your calf muscles pump blood back toward your heart. One study found that a single water immersion exercise session reduced leg volume by roughly 80 to 110 milliliters per leg, a noticeable decrease in puffiness. Reducing salt intake and drinking plenty of water (counterintuitive as it sounds) also help your body regulate fluid balance rather than hold onto excess water.
Avoid standing or sitting in one position for long stretches. If your job keeps you at a desk, flex and rotate your ankles periodically, and take short walking breaks. If you’re on your feet all day, sit down and elevate when you can, even briefly.
When Swelling Is Not Normal
Some degree of swelling in the feet and ankles is a routine part of pregnancy, particularly in the third trimester. But certain patterns signal something more serious.
- Preeclampsia: Swelling that appears suddenly in your face or hands, especially alongside a severe headache that won’t go away, vision changes, upper abdominal pain, or difficulty breathing. Blood pressure readings of 140/90 or higher are a hallmark. This requires immediate medical evaluation.
- Deep vein thrombosis (DVT): Swelling, pain, redness, or warmth in only one leg, particularly in the calf. Pregnancy increases clotting risk, and a clot that breaks loose can travel to the lungs, causing chest pain and shortness of breath.
Mild, symmetrical puffiness in both ankles that improves with elevation is almost always normal pregnancy edema. Swelling that is sudden, severe, one-sided, or accompanied by any of the symptoms above is worth a same-day call to your provider.