Cramp is a painful spasm i.e., sustained contraction of muscles. The muscle usually in the calf becomes knotted and when any attempt is made to move, it becomes doubly rigid and painful.

The predisposing factors range from unaccustomed exercise, strenuous movement, or paradoxically, a prolonged period spent in one position that may have impaired the circulation of the blood to the muscles.

Excessive sweating results in shortage of salts (salt deficiency) that may cause cramps. Dietary deficiencies especially of vitamins C, D, E, B12 and minerals like calcium, magnesium etc., may cause cramps.
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