Staying in one position too long — especially during the day — can tighten muscles and lead to nighttime cramping.
5. Pregnancy
Hormonal changes and increased pressure on blood vessels often cause leg cramps in pregnant women.
6. Certain Medications
Some medications are linked to muscle cramps, including:
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Diuretics
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Statins
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Blood pressure medications
If cramps started after beginning a new medication, consult your doctor.