Dehydration: We 'use up' water in our daily activities -esp exercising (sweating) and even talking because you're expelling air which must be humidified to 100% before it can be breathed in--therefore, when exhaled, a 'cloud' of water goes with it. Try increased fluids. Check urine for a light yellow to clear color-that will indicate you're hydrated. Limit heat exposures. Fatigue should get better if hydrated.
Answered 2/9/2016
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