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Nighttime leg cramps are sudden, involuntary muscle contractions that can be very painful. There isn’t one single cause, and in many cases the exact reason isn’t known.
Common reasons they happen
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Muscle fatigue or overuse: Long periods of walking, standing, or exercise can contribute.
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Muscle shortening during sleep: Calf and foot muscles remain in a shortened position while sleeping, which may make cramps more likely.
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Dehydration: Fluid loss can contribute, particularly after heavy sweating.
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Pregnancy and aging: Both are associated with more frequent nighttime cramps.
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Certain medications: Some medicines, including diuretics and certain cholesterol-lowering medications, can be associated with cramps.
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Nerve or circulation problems: These can sometimes cause or contribute to recurrent cramps.
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Electrolyte abnormalities: Low potassium, calcium, or magnesium can sometimes play a role, although most ordinary nighttime cramps aren’t simply caused by a magnesium deficiency.
What to do when one happens
Gently stretch the affected muscle and massage it. For a calf cramp, straighten the leg and gently pull your toes toward your face. Standing and putting weight on the leg can also help.
If cramps happen frequently, last a long time, or are accompanied by leg swelling, weakness, numbness, or persistent pain, it’s worth discussing them with a healthcare professional.
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