Nighttime leg cramps—sudden, painful tightening of the calf, foot, or thigh—are common and usually harmless. However, some people are more prone to them.
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Who is most at risk?
Older adults — Risk increases with age, partly because muscle mass and conditioning tend to decline.
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Pregnant people — Cramps are particularly common later in pregnancy.
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People who are dehydrated — Not getting enough fluids can contribute to muscle cramping.
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People who are inactive or sit for long periods — Poor conditioning and prolonged sitting can increase susceptibility.
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People taking certain medications — Diuretics and some blood-pressure or cholesterol medicines have been associated with leg cramps.
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People with diabetes or nerve problems — Diabetic neuropathy and other neurological conditions can contribute to cramps.
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People with circulation or kidney problems — Peripheral artery disease and kidney failure can sometimes be associated with nighttime cramps.
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What can help?
Gentle calf stretching before bed, regular physical activity, and adequate hydration may reduce episodes. During a cramp, gently stretch the affected muscle, massage it, or stand and put weight on the leg if safe.
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Don’t automatically assume you need magnesium or potassium supplements. Mineral deficiencies are only one possible cause, and supplementation isn’t appropriate for everyone.
If cramps are frequent enough to disturb sleep, last more than about 10 minutes, or occur with leg swelling, numbness, weakness, or persistent pain, talk with a healthcare professional.
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