Heat exhaustion vs. heat stroke: staying safe through a Florida summer

If you live on the Treasure Coast, you know our summers aren't just hot — they're humid. And that humidity is exactly what makes Florida heat so dangerous. When the air is thick with moisture, your sweat can't evaporate well, so your body's main cooling system stops working the way it should. That's how a regular hot afternoon turns into a medical emergency.

The reassuring part is that heat illness is almost entirely preventable, and the warning signs are easy to learn. This guide walks you through the difference between heat exhaustion and heat stroke, who's most at risk here in Fort Pierce, the medications that quietly raise your risk, and — most important — exactly when a hot day becomes a call to 911.

How your body handles heat (and where it breaks down)

Your body keeps a steady internal temperature mostly by sweating. As sweat evaporates off your skin, it carries heat away. In dry climates this works great. But in Florida's high humidity, sweat just sits on your skin instead of evaporating — so you lose fluids without getting the cooling benefit. {{REVIEW}}

Add direct sun, physical activity, and a few hours, and your core temperature can climb faster than your body can manage. That's the path that leads from feeling "a little wiped out" to a genuine emergency.

Heat exhaustion vs. heat stroke: know the difference

These two get lumped together, but they are not the same thing. One is a warning. The other is a 911 emergency. Learning to tell them apart could save a life.

Heat exhaustion: the warning stage

Signs of heat exhaustion include heavy sweating, cool and clammy skin, weakness or tiredness, dizziness, headache, nausea, muscle cramps, and a fast, weak pulse. {{REVIEW}} This is your body waving a flag. If you act now — get out of the heat, cool off, and rehydrate — most people recover fully.

Heat stroke: the emergency

Heat stroke is when the body can no longer cool itself, and the core temperature climbs to a dangerous level. The tell-tale shift is mental status: confusion, agitation, slurred speech, trouble walking, or passing out. The skin may be hot and dry because sweating has stopped, though it can also still be damp. {{REVIEW}}

If someone is confused, can't be woken, or has hot skin and a high temperature in the heat, treat it as heat stroke. Call 911 immediately. Heat stroke can damage the brain and organs in minutes, and waiting to "see if it passes" is the dangerous choice.

What to do — and the 911 line

Knowing the right move in the moment matters more than memorizing definitions.

For heat exhaustion:

1. Move to a cooler place — shade, indoors, air conditioning.
2. Loosen clothing and rest.
3. Cool the skin with cool water, wet cloths, or a fan.
4. Sip water or an electrolyte drink slowly.
5. Watch closely. If symptoms don't improve within about an hour, or get worse, treat it as an emergency. {{REVIEW}}

For heat stroke — this is a 911 emergency:

1. Call 911 right now.
2. While you wait, cool the person fast however you can — move them to shade or AC, remove extra clothing, and apply cool water, wet towels, or ice packs to the neck, armpits, and groin.
3. Do not give fluids to someone who is confused or not fully awake — they could choke.
4. Stay with them until help arrives.

Aggressive cooling while you wait for paramedics genuinely improves outcomes. Don't hesitate, and don't wait for permission from the symptoms to get worse.

Who's most at risk on the Treasure Coast

Heat doesn't treat everyone equally. Some people are far more vulnerable, and they're all around us in St. Lucie County. {{REVIEW}}

• Older adults. The body's ability to sense and respond to heat fades with age, and many take medications that add risk. Our large retiree community makes this the biggest group to watch.
• Young children and babies. They heat up faster and can't always tell you they're in trouble. Never leave a child in a parked car — interior temperatures turn deadly within minutes.
• Outdoor workers. Landscapers, roofers, farm and construction workers face hours of direct heat and exertion.
• Athletes and anyone exercising outdoors, especially during midday.
• People with chronic conditions — heart disease, diabetes, kidney disease, obesity, or breathing problems.
• People without reliable air conditioning, including during a power outage after a storm. (If that's a worry, see our hurricane health prep guide.)

If you or a loved one falls into one of these groups, a quick check-in through our primary care or preventive care services can help you build a simple summer-safety plan.

The medications that quietly raise your heat risk

This is the part many people miss: some everyday medications make it harder for your body to handle heat. {{REVIEW}} They might reduce sweating, affect your fluid balance, or change how your body senses temperature. Common examples include:

• Diuretics ("water pills"), often used for blood pressure or heart failure
• Some other blood pressure and heart medications
• Certain antidepressants and antipsychotics
• Some allergy medicines (antihistamines)
• Medications for Parkinson's disease and overactive bladder

Here's the important part: do not stop or change any medication on your own. These drugs are doing important work. Instead, ask your provider how to stay safe in the heat while taking them — sometimes it's as simple as timing, hydration, and staying out of peak sun. We review exactly this kind of risk during medication reviews in our chronic disease management visits.

Preventing heat illness: the simple stuff that works

You don't need anything fancy. The basics, done consistently, prevent the vast majority of heat illness.

Hydrate on purpose

• Drink before you're thirsty. Thirst lags behind what your body actually needs.
• A practical gauge: keep your urine pale, not dark yellow.
• For heavy sweating or outdoor work, add electrolyte drinks, not just water.
• Limit alcohol and a lot of caffeine in extreme heat — both can dehydrate you.
• If you have heart or kidney disease, ask your provider about fluid limits before pushing fluids. {{REVIEW}}

Time it and shade it

• Avoid the hottest hours, roughly late morning through mid-afternoon, for hard activity.
• Take breaks in shade or AC. If your home isn't cool, find a public space that is — a library, a mall, a cooling center.
• Wear light, loose, light-colored clothing and a wide-brimmed hat.

Watch the heat index, not just the temperature

The heat index combines temperature and humidity to show what it really feels like — and in Florida, that number is often much higher than the thermometer reading. {{REVIEW}} Check the National Weather Service forecast and plan your day around it.

Check on the vulnerable

During a heat wave, check on older neighbors and relatives at least twice a day. A quick call or visit catches trouble early — and many heat deaths happen to people who were alone.

Never leave anyone in a parked car

Not for "just a minute." Car interiors heat up shockingly fast, and this remains a tragic, fully preventable cause of death every Florida summer.

When to involve your provider

Most healthy people can manage summer heat with the steps above. But it's worth a conversation with your provider if you:

• Take any medication on the risk list above
• Have a heart, kidney, lung, or other chronic condition
• Are caring for an older adult or young child through the summer
• Had a heat-related episode and want to prevent the next one

We can review your medications, set realistic hydration and activity guidance for your health, and make a plan that fits your summer. Much of this can be handled by telehealth, so you don't have to leave the AC to get answers.

Florida summers are long, and the heat is real — but with a little awareness, you and the people you love can move through the season safely. Learn the difference between exhaustion and stroke, respect the medications you take, and never be shy about calling 911 when something looks wrong.

Want help building a summer-safety plan that fits your health and your medications? Book a visit at our Fort Pierce office, contact us with your questions, or read our hurricane season health prep guide to get ready for the rest of what a Florida summer brings.