Leg numbness during pregnancy is common and usually caused by pressure on nerves running through your pelvis and thighs. The growing uterus, weight gain, and shifting posture all compress nerves that weren’t under strain before pregnancy. Relief comes from repositioning, gentle stretching, managing swelling, and avoiding prolonged standing or sitting. Most pregnancy-related leg numbness resolves completely after delivery.
Why Pregnancy Causes Leg Numbness
Two main nerves are responsible for most cases of leg numbness during pregnancy. The lateral femoral cutaneous nerve runs from your lower spine through the groin and into the front and outer thigh. It’s a pure sensory nerve, meaning it only carries sensation, not movement signals. As your abdomen grows, increased pressure in the pelvic area compresses this nerve where it passes under the inguinal ligament near the groin. This produces a condition called meralgia paresthetica: numbness, tingling, or burning along the outer thigh, usually on one side.
The sciatic nerve, which runs from the lower back through the buttocks and down each leg, is the other common culprit. As your belly grows forward, the curve of your spine becomes more pronounced to counterbalance the weight. This postural shift, combined with the baby’s position during the second and third trimesters, can press directly on the sciatic nerve. The result is numbness or pain that radiates from the buttock down the back of the leg.
Fluid retention adds another layer. Swelling in the legs and ankles can put pressure on smaller nerves, creating diffuse tingling or numbness in the feet and lower legs. This is especially noticeable after long periods of standing or at the end of the day.
Sleeping Positions That Reduce Nerve Pressure
How you sleep makes a significant difference. Lying on your left side is the recommended position because it takes pressure off the large blood vessels that run along your spine, improving circulation to your legs. The key is keeping your hips and legs even so your spine stays in a neutral position rather than twisting.
Place a pillow or several pillows between your knees, thighs, and feet so your upper leg sits level with your pelvis and mirrors the position of the bottom leg. This prevents the top leg from pulling your pelvis forward and compressing the nerves on the lower side. A rolled washcloth or small pillow tucked under your abdomen supports the weight of your uterus and keeps it from dragging on the pelvic nerves. If you feel pressure through your lower back, a rolled towel placed between your ribs and hips fills that gap.
If you tend to sleep on your back, use a wedge pillow to prop yourself at an angle rather than lying flat. Placing pillows under your knees when partially reclined can also relieve lower back pressure that contributes to nerve compression.
Stretches That Help
Gentle stretching targets the muscles surrounding compressed nerves, creating more space and reducing irritation. These stretches are safe during pregnancy when done slowly and without forcing any position.
- Cat-cow stretch (low back stretch): Start on your hands and knees with your head in line with your back. Pull in your stomach, rounding your back slightly. Hold for several seconds, then relax your stomach and let your back return to flat. Don’t let it sag downward.
- Backward stretch: From hands and knees, curl backward toward your heels as far as your knees allow comfortably. Tuck your head toward your knees and keep your arms extended in front of you. Hold for several seconds, then return to the starting position. A fitness ball under your hands can make this easier to control.
- Standing pelvic tilt: Stand with your back flat against a wall, feet shoulder-width apart. Push the small of your back into the wall, hold for several seconds, then release. This stretch loosens the lower back muscles that tighten around the sciatic nerve.
- Piriformis stretch: Sit in a chair and cross one ankle over the opposite knee. Gently lean forward until you feel a stretch deep in the buttock of the crossed leg. The piriformis muscle sits directly over the sciatic nerve, and releasing tension here can noticeably reduce numbness down the leg.
Doing these stretches two or three times a day, particularly before bed and after long periods of sitting, helps keep nerve compression from building up.
Managing Swelling and Circulation
Swelling-related numbness responds well to compression stockings. Graduated compression stockings apply about 27 mmHg of pressure at the ankle and 18 mmHg at the calf, which pushes fluid upward and reduces the pooling that presses on nerves. Below-knee stockings are sufficient for most pregnancy-related swelling. Put them on in the morning before swelling starts for the best effect.
Elevating your legs above heart level for 15 to 20 minutes several times a day also helps fluid drain. When sitting at a desk or on the couch, propping your feet on a stool or ottoman keeps blood from pooling in the lower legs. Avoid crossing your legs, which compresses the nerves behind the knee.
Avoiding Common Triggers
Standing or walking for long stretches worsens nerve compression in the thigh and pelvis. Symptoms of meralgia paresthetica specifically worsen after prolonged standing. If your job or daily routine requires being on your feet, take sitting breaks every 30 minutes. The same applies in reverse: sitting in one position for too long, especially with poor posture, increases sciatic nerve pressure. Alternating between sitting and gentle movement throughout the day is more effective than either one alone.
Tight clothing around the waist and hips can directly compress the lateral femoral cutaneous nerve where it passes through the groin. Low-rise maternity pants and stretchy waistbands reduce this pressure. A maternity support belt can help redistribute the weight of your belly away from the pelvis, but make sure it sits below the hip bones rather than pressing into the groin crease.
Nutritional Factors Worth Checking
Iron deficiency plays a role in restless legs and nerve-related symptoms during pregnancy. Serum ferritin, the blood marker for iron stores, drops to about 50% of pre-pregnancy levels by mid-pregnancy. If your ferritin falls below a certain threshold, iron supplementation on top of a standard prenatal vitamin can help. Folate deficiency has also been linked to nerve symptoms in the legs during pregnancy. Both are worth discussing with your provider if numbness is persistent or accompanied by an uncontrollable urge to move your legs, which may indicate restless legs syndrome rather than simple nerve compression.
When Numbness Signals Something Serious
Most leg numbness in pregnancy is harmless nerve compression that resolves on its own. But certain patterns suggest a blood clot (deep vein thrombosis), which pregnancy increases the risk for. Contact your midwife or doctor right away if you notice pain, swelling, and tenderness in one leg, particularly in the calf. Warmth or redness in the affected area, especially at the back of the leg below the knee, is another warning sign. Blood clots typically affect only one leg and cause a heavy, aching pain that gets worse when you walk, which is different from the tingling or pins-and-needles sensation of nerve compression.
Sudden numbness in both legs, numbness accompanied by severe headache or visual changes, or loss of bladder control are separate red flags that need immediate medical attention.
What to Expect After Delivery
Pregnancy-related meralgia paresthetica typically improves after delivery as the abdominal pressure disappears. For most women, the numbness fades within the first few weeks postpartum. In cases involving more significant nerve compression, improved function is expected within six to eight weeks, with full recovery in most cases by six months. Sciatic symptoms similarly resolve as the uterus shrinks and spinal posture returns to its pre-pregnancy alignment. If numbness persists beyond a few months postpartum, it may warrant further evaluation, but the vast majority of cases resolve completely without any lasting effects.