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 Heat exhaustion is a condition that occurs when the body overheats. 2  Heat exhaustion is caused by the failure of the body's cooling mechanism to maintain a normal core temperature. 3  Symptoms of heat exhaustion may include. 4  weakness, 5  muscle cramping, 6  heavy sweating,  headache,