Heat cramps are painful, brief muscle cramps that occur during exercise or work in a hot environment. Muscles may spasm or jerk involuntarily. Cramping may also be delayed and occur a few hours later.
Heat cramps usually involve the muscles fatigued by heavy work such as calves, thighs, abdomen, and shoulders.
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Heat illness may be viewed as a continuum of illnesses relating to the body's inability to cope with heat.
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