Compare and contrast heat exhaustion and heat stroke

Heat exhaustion occurs when a person has not been properly hydrated.

Heat stroke is the most sever form of heat illness and is a life-threatening medical emergency.

Heat exhaustion and heat stroke are both caused by prolonged exposure to the Sun with very high temperatures. Heat exhaustion is typically less severe with symptoms of headache, nausea, pale skin, and fatigue. Heat stroke results when the body cannot regulate its body temperature any longer, and it is life threatening. Immediate medical assistance should be obtained if you suspect heat stroke.