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.
Heat exhaustion signs and symptoms include: Faintness or dizziness; Nausea or vomiting; Heavy sweating often accompanied by cold, clammy skin; Weak, rapid pulse; Pale or flushed face; Muscle cramps; Headache; Weakness or fatigue; If you suspect heat exhaustion. Untreated, heat exhaustion can lead to heatstroke, which is a life-threatening condition. 1  If you suspect heat exhaustion, take these steps immediately: 2  Move the person out of the heat and into a shady or air-conditioned place. 3  Lay the person down and elevate the legs and feet slightly. 4  Remove tight or heavy clothing.