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Muscle cramps (sometimes called charley horses) are caused by muscle spasms (contractions). Common sites of muscle cramps include the calf, abdomen, hand, ribs, and thighs. Possible causes include poor circulation, dehydration, fatigue, hot outdoor temperatures, calcium deficiency, and more. Follow the links below to find WebMD's comprehensive coverage about how muscle cramps are caused as well as treatments and prevention tips and much more.

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Thumbnail: Cramps While Running: Causes, Prevention, Treatments

Many runners experience cramps while running or jogging. Learn why, and how to prevent and treat this pain.

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Heart Rate Calculator

Ensure you're exercising hard enough to get a good workout, but not strain your heart.

While you are exercising, you should count between...

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Heart Rate Calculator

Ensure you're exercising hard enough to get a good workout, but not strain your heart.

While you are exercising, you should count between...

-
Beats
PER
Seconds