Heat Exhaustion vs. Heat Stroke: Know the Difference Before It’s Too Late

Summer fun, sports practices, hiking, beach days, working outside… heat is part of life this time of year. But every summer, emergency rooms see people who waited too long to recognize the warning signs of heat illness.

And here’s the scary part:

Heat exhaustion can turn into heat stroke FAST.

Knowing the difference could help you protect your child, your spouse, your coworker—or even yourself.

What Is Heat Exhaustion?

Heat exhaustion happens when the body gets overheated and loses too much water and salt through sweating. Your body is struggling to cool itself down, but it’s still able to function.

Common Signs of Heat Exhaustion:

• Heavy sweating

• Pale, cool, clammy skin

• Dizziness or lightheadedness

• Headache

• Weakness or fatigue

• Muscle cramps

• Nausea or vomiting

• Fast heartbeat

• Fainting

A person with heat exhaustion is usually still alert and able to talk normally.

What To Do:

• Move them to a cool or shaded area immediately

• Have them sit or lie down

• Loosen tight clothing

• Apply cool wet cloths or ice packs to the neck, armpits, and groin

• Give cool water or sports drinks slowly if they are awake and not vomiting

• Rest and monitor closely

If symptoms get worse, don’t improve, or the person becomes confused, call 911.

What Is Heat Stroke?

Heat stroke is a LIFE-THREATENING emergency.

This happens when the body can no longer regulate temperature and the core temperature rises dangerously high—often above 104°F.

At this point, the brain and organs can begin shutting down.

Signs of Heat Stroke:

• Confusion

• Acting strangely

• Slurred speech

• Seizures

• Loss of consciousness

• Hot skin (may be dry OR sweaty)

• Very high body temperature

• Rapid pulse

• Trouble walking

• Severe headache

The biggest difference? A person with heat stroke often has changes in mental status.

If someone seems confused, disoriented, or unresponsive in the heat, treat it like an emergency.

What To Do for Heat Stroke

CALL 911 IMMEDIATELY.

Then begin cooling the person right away:

• Move them to shade or air conditioning

• Remove excess clothing

• Use cold water, ice packs, wet towels, or fans

• If possible, immerse them in cool water

• Do NOT force fluids if they are confused or unconscious

Every minute matters.

Who Is Most at Risk?

Heat illness can happen to anyone, but higher-risk groups include:

• Infants and young children

• Older adults

• Athletes

• Outdoor workers

• Hikers and campers

• People with heart disease or chronic illness

• Pets left outside or in vehicles

• Anyone without air conditioning

Prevention Tips

The best treatment is prevention.

Simple Ways to Stay Safe:

• Drink water BEFORE you feel thirsty

• Take breaks in the shade

• Wear lightweight clothing

• Avoid strenuous activity during peak heat

• Never leave kids or pets in cars

• Check on elderly neighbors and family

• Use sunscreen—sunburn affects your body’s ability to cool itself

Final Thoughts

Heat exhaustion is serious.

Heat stroke is deadly.

Knowing the difference—and acting quickly—can save a life.

At Live and Learn CPR, we believe first aid education helps build safer families and stronger communities. Because emergencies don’t wait for perfect conditions—and neither should your training.