Leg Cramps at 37 Weeks Pregnant
Leg cramps — sudden, painful muscle spasms usually in the calf — affect up to 50% of pregnant women, most often at night in the second and third trimesters.
👶 What's Happening at Week 37
Your baby is now the size of a winter melon.
- The baby is now 'early term' — nearly ready for birth.
- Brain and lung maturation continues.
- The baby practices breathing, sucking, and gripping.
🔬 Why You're Experiencing Leg Cramps at Week 37
- Increased weight and pressure on leg muscles and nerves
- Compression of leg blood vessels by the growing uterus
- Calcium or magnesium deficiency
- Dehydration
- Reduced circulation from prolonged sitting or standing
💊 Relief Tips for Week 37
📋 Other Week 37 Symptoms
⚠️ Call Your Doctor If…
- Leg pain, swelling, redness, or warmth in one leg — possible deep vein thrombosis (DVT)
- Cramps that are severe and don't resolve with stretching
- Cramps accompanied by significant leg swelling that is not relieved by elevation
- You experience cramps very frequently and they are affecting your sleep and function
Frequently Asked Questions
Why do leg cramps happen at night during pregnancy?
Nighttime leg cramps may be related to muscle fatigue accumulated during the day, reduced circulation when lying still, and the body's overnight fluid redistribution.
Can magnesium help pregnancy leg cramps?
Studies suggest magnesium supplements may reduce the frequency and severity of pregnancy leg cramps. Discuss safe dosing (typically 300 mg/day) with your provider.
Are pregnancy leg cramps a sign of calcium deficiency?
Low calcium may contribute, but the evidence is mixed. Ensuring adequate calcium intake (1,000 mg/day in pregnancy) from dairy and leafy greens is good general practice.
How do I tell a leg cramp from a blood clot?
A muscle cramp resolves quickly with stretching and movement. A DVT (blood clot) causes persistent pain, swelling, warmth, and redness that doesn't go away. DVT requires immediate medical care.