If calcium levels are low and PTH levels are normal or low, then PTH is not responding properly and the person tested probably has hypoparathyroidism. Hypoparathyroidism is a failure of the parathyroid glands to produce sufficient PTH.
Heat exhaustion definition and facts. 1  Heat exhaustion is one part of the spectrum of heat-related illnesses that begin with heat cramps, progresses to heat exhaustion, and finally to heat stroke.  The body cools itself by sweating and allowing that sweat to evaporate.
How to Deal With Heat Exhaustion. Heat exhaustion is a feeling of fatigue and illness, including dizziness and nausea, which occurs when the body loses too much salt and water as the result of heavy perspiration. Heat exhaustion is fairly common and can happen to people who exercise or work in hot conditions.