Muscle cramp is the sudden, involuntary contraction of muscle which does not relax, and is accompanied by a sudden burst of pain. It can be caused by muscle strain, sudden movement after idling, dehydration, ion imbalance, etc. It is usually harmless and ceases after a few minutes.

Most muscle cramps develop in the leg muscles, particularly in the calf. Besides the sudden, sharp pain, you might also feel or see a hard lump of muscle tissue beneath your skin.

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