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.
What causes heat exhaustion? Heatârelated illness, such as heat exhaustion, occurs when your body canât keep itself cool. As the air temperature. rises, your body stays cool when your sweat evaporates. On hot, humid days, the evaporation of sweat is slowed. by the increased moisture in the air.