Leg cramps during pregnancy

By trimester

Weeks 1–13

1st trimester

Leg cramps are less common this early, but rising blood volume can start the pattern. Simple habits like drinking enough water and a gentle calf stretch before bed are a good baseline now.

Weeks 14–27

2nd trimester

Cramps often pick up as the growing uterus shifts your posture and circulation. Nightly calf stretches, short walks, and staying hydrated through the day tend to help the most.

Weeks 28–birth

3rd trimester

This is when cramps are usually most frequent and most likely to wake you at night. Keep stretching before bed and wearing supportive shoes, and call your healthcare provider promptly about any new one-sided leg swelling, redness, or pain that does not feel like a typical cramp.

What does the evidence show for leg cramps?

• Ordinary leg cramps typically grab the calf muscle at night, which matches the pattern most pregnant women describe. 1
• The most direct pregnancy-focused review found mixed evidence for magnesium and calcium, though one small trial found vitamin B supplements eased cramp frequency and intensity. 2
• A pooled analysis of four pregnancy trials found oral magnesium supplements were not significantly better than a placebo at easing leg cramps. 3
• Getting enough magnesium from food, roughly 350 to 400 mg a day depending on age, matters in pregnancy since low magnesium is linked to muscle cramping. 4
• A leg that turns swollen, tender, and painful to the touch, rather than just briefly crampy, can signal a blood clot and needs prompt medical attention. 5

When should I call my provider about leg cramps?

A cramp that resolves within a few minutes with stretching is the ordinary kind. A leg that stays swollen and tender, painful to the touch even after the cramping itself has passed, is different, since that combination is the pattern tied to a blood clot rather than a muscle cramp. It is worth a same-day call to your provider rather than more stretching and waiting to see if it settles. Whatever the pattern, any symptom that feels beyond your usual range is a reason to call: obstetric teams expect these questions and would rather hear early than late.