Heat Exhaustion vs Heat Stroke in Miami: When to Come In

Medically reviewed by Shane D. Naidoo, MD
Medical Director, TrufaMED Urgent Care & Concierge Medicine
Board-Certified, Emergency Medicine
Last reviewed: June 2026

Miami's summer heat is unforgiving and gets worse every year. Heat index days above 105°F are now routine from June through September. The clinical pattern we see at our Surfside urgent care follows a predictable curve: a string of normal days, a humid heat wave, and a wave of patients walking in with cramping, lightheadedness, nausea, and concerning core temperatures.

The two conditions to know are heat exhaustion and heat stroke. Heat exhaustion is uncomfortable but usually manageable in urgent care; heat stroke is a life-threatening emergency. Telling them apart fast matters. This is the cheat sheet our triage RNs use.

Heat Exhaustion: The Manageable Version

Heat exhaustion happens when your body is losing more fluid and electrolytes than it is taking in, but core temperature remains under control. The typical patient is a tourist or outdoor worker who has been in the sun for several hours without enough water, often after a hot Friday Marlins game, a beach day, or a long boat ride.

Symptoms include:

• Heavy sweating that is still active
• Cool, clammy, pale skin
• Muscle cramps (calves, abdomen, hands)
• Headache, dizziness, lightheadedness
• Nausea, sometimes vomiting
• Fast heart rate
• Core temperature usually 100–103°F
• Mental status normal: the patient can carry on a conversation

Treatment: get out of the heat, lie down with feet elevated, sip cold electrolyte solution if not vomiting, and apply cool compresses. Recovery typically occurs over thirty to ninety minutes. An IV with normal saline and electrolytes (our Rehydrate+ formula, $225) shortens recovery to roughly thirty minutes and is what we order most for heat exhaustion patients who walk into the clinic.

Heat Stroke: The Emergency

Heat stroke is when the body's temperature regulation has failed. Core temperature climbs above 104°F, sweating may stop, and the central nervous system starts to malfunction. Untreated, heat stroke can cause organ damage and death within hours.

Symptoms include:

• Core temperature above 104°F
• Hot, dry, sometimes red skin (sweating has often stopped)
• Altered mental status: confusion, agitation, slurred speech, seizures, or loss of consciousness
• Rapid breathing, rapid pulse
• Severe headache, sometimes vomiting

This is a 911 call. Do not bring a suspected heat stroke patient to urgent care; call emergency services and begin cooling immediately. Move the patient out of the heat, remove excess clothing, and apply cold packs or wet sheets to the neck, armpits, and groin until paramedics arrive. Heat stroke patients need ER-level monitoring during cooling and often require hospital admission for organ function monitoring.

Who Is at Higher Risk

Some Miami populations are at materially higher risk:

• Outdoor workers: construction, landscaping, valet, beach staff
• Athletes training in afternoon heat (we see this with high school football and youth soccer preseason)
• Tourists from cooler climates not yet acclimated to Miami humidity
• Elderly patients, especially those on diuretics or with cardiovascular disease
• Children left in cars (a fatal risk window of minutes, not hours)
• Patients on certain medications: anticholinergics, beta blockers, SSRIs, antipsychotics, lithium
• Patients with chronic illness: diabetes, kidney disease, dysautonomia

What We Do at TrufaMED for Heat Exhaustion

When a patient walks in with suspected heat exhaustion, our protocol is:

• Immediate vital signs including core temperature (rectal or tympanic depending on presentation)
• Move to the coolest exam room with the patient supine, feet elevated
• Start an IV with 1 liter of normal saline and electrolytes (Rehydrate+ formula)
• Check finger-stick glucose; many heat exhaustion patients are mildly hypoglycemic
• Anti-emetic medication (ondansetron) if vomiting is part of the picture
• Recheck vitals every fifteen minutes during the IV
• Discharge home with hydration instructions, recheck criteria, and a same-day follow-up call if the patient lives nearby

Most heat exhaustion patients are discharged in under 90 minutes. The IV is the part that turns a four-hour afternoon of misery into a manageable evening.

Prevention: A Miami-Specific Cheat Sheet

• Pre-hydrate before sun exposure. Two cups of water in the hour before going out matters more than chugging during.
• Replace electrolytes alongside water, especially in patients who sweat heavily. Plain water alone after heavy sweating can cause hyponatremia.
• Avoid the 12 PM to 4 PM window for sustained outdoor exertion in July and August.
• Acclimatize gradually: tourists arriving from colder climates need two to three days before tolerating Miami midday exposure safely.
• Watch for the warning signs in companions: a person who has stopped sweating during heavy exertion is in trouble, not in good shape.

Frequently Asked Questions

Can I go to urgent care for heat stroke?

No. Heat stroke is a 911 call. Urgent care is appropriate for heat exhaustion, where core temperature is under 103°F and the patient is mentally alert.

How much does an IV for heat exhaustion cost?

Our Rehydrate+ IV is $225. If you have insurance and the visit is billed as an urgent care evaluation, your standard copay applies.

Should I drink Gatorade or water after a hot Miami afternoon?

Both, but if you have been sweating heavily for more than an hour, an electrolyte-containing drink is preferable. Plain water alone in large volumes after heavy sweating can dilute sodium dangerously.

Are kids in Miami summer camps at risk?

Yes, particularly during preseason football and soccer practice. Pediatric heat illness is common in August. Coaches should monitor for fatigue, headache, and nausea and pull players promptly.