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.
As the temperature rises, your body dissolves sweat to stay cool. On hot, humid days, the increased moisture in the air slows down this process. When your body can't cool, your temperature rises and you can become ill. Hot weather and exercise are the main causes of heat exhaustion and heatstroke. In hot settings, you need to be mindful of the temperature outside. The heat index is not the same as the temperature.