Why do I get charley horses?

Last updated September 3, 2026.

A charley horse is a sudden muscle cramp - usually the calf at night - fed by overuse, dehydration, low minerals like potassium or calcium, and some medicines like statins or diuretics. The NHS says they are common and usually harmless. Stretching and standing on the leg end them faster. Pymander is a free AI doctor, 24/7 by text, and can help you find your pattern.

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