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.
The following are the most common signs and symptoms of heat exhaustion: 1  nausea. 2  dizziness. 3  weakness. headache.  pale, cool and moist 1  skin. fast and weak pulse. 2  disorientation. paleness.  muscle 1  cramps. tiredness.  fainting.