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Leg Cramps in Pregnancy
Very CommonSecond/Third TrimesterPreventable
You are woken from sleep by an excruciating cramp in your calf. You cannot breathe through it. Pregnancy leg cramps affect about 50% of pregnant women, mostly at night, and are worst in the second and third trimester. The exact cause is not fully understood, but dehydration, mineral deficiencies, and reduced circulation all play a role.
Why They Happen
| Potential Cause | Evidence |
|---|---|
| Magnesium deficiency | Strong - magnesium supplements reduce frequency |
| Calcium imbalance | Moderate - calcium plays a role in muscle contraction |
| Dehydration | Moderate - poor fluid balance affects electrolytes |
| Reduced circulation in legs | Strong - especially when lying flat |
| Nerve compression from uterus | Moderate - uterus presses on leg nerves |
| Phosphorus excess (from processed food) | Some evidence |
How to Stop a Cramp Fast
- Straighten your leg and flex your foot hard - pull your toes toward your shin
- Stand up and put your full weight on the cramped leg if you can - walking it off works quickly
- Massage the muscle firmly in the direction of the cramp (not against it)
- Apply a warm heat pack immediately after - this relaxes the muscle and speeds recovery
Prevention Strategies
- Magnesium supplements (300mg daily) - some studies show a 50% reduction in cramp frequency. Ask your doctor first
- Stay well hydrated throughout the day - aim for 2.5 litres
- Stretch your calves before bed: stand facing a wall, step one foot back and press heel to floor
- Avoid sitting with legs crossed for long periods - reduces circulation
- Regular gentle walking or swimming improves leg circulation
DVT warning
If you have calf pain that is persistent (not a brief cramp), combined with redness, swelling, or warmth in one leg, seek urgent medical care. Deep vein thrombosis (DVT) risk is increased in pregnancy.