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Vital signs. 1  High temperature, increased heart rate, decreased blood pressure, and faster breathing are signs of potential dehydration and other illnesses. 2  Taking the pulse and blood pressure while the person is lying down and then after standing up for one minute can help determine the degree of dehydration.
When the body suffers from chronic dehydration, blood flow and blood pressure drop due to a lack of water and oxygen in the blood. Basically, dehydration results when the body loses more water than it takes in. This naturally causes the muscles and nerve function to literally burn out due to profuse sweating after exertion. If you have the stomach flu, and are suffering from water loss (due to a combination of vomiting and/or diarrhea) you will often feel fatigued. This is why doctors will recommend plenty of rest along with plenty of fluids, like water, juice, and herbal teas to replenish lost water levels. Next Â».