Symptoms of Heat Stroke ARE A MEDICAL EMERGENCY!

The hallmark symptom of heat stroke is a core body temperature above 105 degrees Fahrenheit. But fainting may be the first sign.Other symptoms may include:

• Throbbing headache
• Dizziness and light-headedness
• Lack of sweating despite the heat
• Red, hot, and dry skin
• Muscle weakness or cramps
• Nausea and vomiting
• Rapid heartbeat, which may be either strong or weak
• Rapid, shallow breathing
• Behavioral changes such as confusion, disorientation, or staggering
• Seizures
• Unconsciousness

Source: http://www.webmd.com/a-to-z-guides/heat-stroke-symptoms-and-treatment 

Symptoms of Heat Exhaustion

The most common signs and symptoms of heat exhaustion include:

• confusion
• dark-colored urine (which indicates dehydration)
• dizziness
• fainting
• fatigue
• headache
• muscle cramps
• nausea
• pale skin
• profuse sweating
• rapid heartbeat