The symptoms of heat exhaustion include feeling dizzy, weak, hot, and nauseated. You might have a headache, experience shortness of breath, and a loss of appetite. People feeling the signs of heat exhaustion should get out of the hot sun, drink water, and rest. Most people fully recover from heat exhaustion within 24 hours. If left untreated, heat exhaustion can lead to heat stroke.
Heat stroke is far more serious and dangerous than heat exhaustion.
When the body's temperature reaches 105 degrees, heat stroke is likely. During heat stroke, organs begin to shut down. In particular, heat stroke affects the brain and nerve cells that are part of the central nervous system. That explains why people with heat stroke may become confused, hallucinate, and may even slip into a coma. Rather than being sweaty, the skin of a person suffering heat stroke feels hot and dry.