As water is lost, dehydration and its effects can occur. This can result in shifts of concentrations of several electrolytes in the body. Usually, salts become more concentrated but sodium is lost in sweat and can be reduced. The blood also becomes thicker as the circulating volume of water drops. These changes can lead to fatigue and reduced physical and mental performance. However, often there are no symptoms until significant changes have occurred. Then the symptoms can develop rapidly, resulting in giddiness, fatigue, irritability, fainting, and cramps (3).

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