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.
A person with heat exhaustion loses body fluids and salts from being exposed to high temperatures for long periods of time. Symptoms of heat exhaustion include fatigue as the body becomes dehydrated, blood volume is reduced and blood pressure drops. Heat exhaustion is a separate condition to heatstroke. The risk of heat-related illness dramatically increases when the environmental temperature climbs to 26Â°C or higher.