My son has heat exhaustion. is that something serious?

Over-heated: Heat exhaustion can become serious if it's untreated. Symptoms include heavy sweating, rapid breathing, and a fast pulse. If not dealt with, and the patient cooled soon, it can lead to heat stroke, which can be fatal if not treated.

Can be: If your son is healthy, mild heat exhaustion will likely resolve with rest, keeping cool, and plenty of fluids. If it is more severe, i.e. Having vomitting/headaches/weakness etc....He may need hospital care. In really severe case, heatstroke may occur..Often body tempt rising to 106 or more...Resulting in neurologic dysfunctions. Consult with your doc for care... Good luck.