Muscle cramps- What causes them and how to avoid them?

A muscle cramp is a sudden and involuntary contraction of one or more of your muscles. Though generally harmless, muscle cramps can make it temporarily impossible to use the affected muscle. They can be very painful and very inconvenient.
Long periods of exercise or physical labor, particularly in hot weather, can lead to muscle cramps. Some medications and certain medical conditions also may cause muscle cramps. Most commonly muscle cramps occur in the calf muscles.

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