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.
1 Complications of heat exhaustion include nausea, vomiting, dehydration and muscle weakness. 2  If the activity is not stopped and the person left in a hot environment, there can be progression of symptoms to heat stroke, a life threatening emergency.