Leg cramps are very common during pregnancy, especially in the second and third trimesters. They often happen at night and can be sudden and painful. Why leg cramps happen during pregnancy 1. Mineral imbalances Low calcium, magnesium, or potassium can affect muscle function Increased demand from the growing baby can reduce maternal levels 2. Dehydration Not drinking enough fluids can lead to electrolyte imbalance and muscle cramping 3. Poor blood circulation The enlarging uterus puts pressure on blood vessels, slowing circulation to the legs 4. Weight gain & muscle fatigue Extra weight increases strain on leg muscles, especially the calves 5. Hormonal changes Pregnancy hormones relax muscles and ligaments, making them more prone to spasms 6. Prolonged sitting or standing Staying in one position too long reduces blood flow to the legs 7. Compression of nerves The uterus may press on nerves supplying the legs What helps prevent or reduce leg cramps Stretch calf muscles before bed Stay well hydrated Gentle exercise (walking, prenatal yoga) Massage or warm compress on the calves Avoid pointing toes downward while sleeping Wear comfortable, supportive footwear Sleep on your left side to improve circulation Adequate calcium and magnesium intake (through diet or supplements if prescribed) When to see a doctor urgently Seek medical advice if: Cramps are severe, persistent, or worsening One leg is swollen, red, or warm (could indicate a blood clot) You have sudden shortness of breath or chest pain