How to Treat Heat Exhaustion at Home

Most cases of heat exhaustion never make it to a hospital — they get handled at home, in the first 30 to 60 minutes, by someone who recognizes what is happening and acts on it. Heat exhaustion is serious, but unlike heat stroke it is usually within the range of what home care can manage, as long as the basics are done well and the situation is watched closely.

This article walks through what to actually do — the first 30 minutes, the next few hours, the next day or two — and the lines that tell you to stop self-managing and call for help.

First, make sure it is heat exhaustion

Home care is the right answer only when the situation is actually heat exhaustion. The picture is:

• Body temperature elevated but below 104°F (most commonly 100–103°F)
• Heavy sweating, pale and clammy skin
• Headache, dizziness, weakness
• Nausea, sometimes vomiting
• Fast pulse, possibly fast breathing
• The person is alert, oriented, and behaving normally

If the person is confused, slurring, behaving oddly, or unconscious, this is heat stroke, not heat exhaustion, and it needs emergency care. Cool them aggressively while waiting for help.

The first 30 minutes

These are the most important minutes. The whole point of acting fast is to keep the situation from sliding into heat stroke.

Step 1: Get them out of the heat

Move the person to the coolest place quickly available — air-conditioned room first, shaded area with airflow second, any shade third. Stop whatever activity they were doing. Do not let them push through.

Step 2: Lay them down

Lay them flat with the legs slightly raised. This helps blood pressure stabilize and reduces dizziness. If they are nauseated, lay them on their side.

Step 3: Loosen and remove clothing

Loosen tight clothing. Remove extra layers, jackets, heavy fabrics. Exposed skin cools faster.

Step 4: Start active cooling

Cooling is the priority and should not wait for fluids. Use whatever you have:

• Cool damp cloths or towels on the forehead, neck, chest, and inside of the wrists.
• Cool water or shower. A cool (not ice cold) shower is very effective if the person is steady enough.
• Ice packs at the neck, armpits, and groin. These spots have large blood vessels close to the skin and move heat out fast.
• Fans. Air movement plus damp skin is one of the most effective combinations.
• Misting with a spray bottle while a fan blows over them.

Keep cooling for the full first 30 minutes, not just a few minutes until things look better.

Step 5: Rehydrate slowly

If the person is alert and not vomiting, start sipping cool fluids. Slow is the operative word — gulping a quart of water is more likely to cause vomiting than help. Better choices:

• An electrolyte drink (sports drink, oral rehydration solution, electrolyte mix in water)
• Coconut water
• A glass of water with a small amount of salt and a squeeze of lemon
• Cool broth

Plain water alone is fine for mild cases but is not ideal after heavy sweating. The body has lost salt as well as water; replacing both works better than replacing only water.

The next few hours

After the first 30 minutes, the acute crisis should be settling. The job now is steady recovery and watching for backsliding.

Continue cooling, passively

Stay in a cool environment. Keep skin slightly damp if comfortable. Avoid going back outside, even if they feel better.

Continue rehydrating, steadily

Sip electrolyte fluids across the next several hours. A reasonable target is around a litre or so in the first hour or two, then steady intake through the rest of the day, but more important than a specific number is consistent slow sipping rather than infrequent gulping.

Add food once nausea passes

Once they can keep fluids down and are not actively nauseated, food helps. Salty, easily digestible options work well — crackers, broth-based soup, pretzels, a banana, a sandwich. Food brings sodium back in and supports the rest of recovery.

Rest

No exercise. No standing for long periods. No alcohol. Limit caffeine. The body needs the next several hours to rebuild fluid volume and electrolyte balance.

Keep watching

The biggest mistake is assuming the situation is fully resolved after 30 minutes of looking better. Check on them every 30 to 60 minutes for the next 2 to 3 hours. Watch for:

• Returning dizziness or weakness on standing
• Persistent nausea or new vomiting
• Headache that worsens rather than fades
• Any drift in mental status — even subtle confusion

If anything is trending the wrong way, escalate to medical evaluation.

The next day or two

Heat exhaustion recovery is rarely "all better in two hours." A typical pattern includes 24 to 72 hours of feeling slightly off — fatigue, mild lingering headache, reduced appetite, easy dizziness on standing quickly, disrupted sleep. This is normal and does not mean home care failed.

To support recovery:

• Stay out of demanding heat for at least 24 to 48 hours. Returning to the same conditions too soon is the most reliable way to land back in heat exhaustion.
• Keep up steady fluid and electrolyte intake. Recovery is partly a rehydration project across the next day or two, not just the first hour.
• Eat normally as appetite returns. Include salty foods.
• Sleep extra. Recovery is partly sleep-driven.
• Scale back exercise. Light walking is fine on day two; save the hard workout for later in the week.
• Skip alcohol for at least a day or two.

If the person is fully back to baseline within 72 hours, home care worked.

When to stop home care and call for help

Home care is the right approach for most heat exhaustion cases, but several situations push the decision toward medical evaluation:

• Persistent vomiting that prevents fluid intake for more than 30 to 60 minutes.
• Symptoms not improving within an hour of good cooling and rehydration.
• Symptoms getting worse at any point.
• Any sign of confusion, agitation, slurred speech, or unusual behavior — this is the heat stroke line, and it changes the situation entirely.
• Body temperature climbing toward or above 104°F despite cooling.
• Fainting that does not quickly resolve.
• Very reduced urine output through the rest of the day.
• Dark, tea-colored urine — can suggest muscle breakdown and needs evaluation.
• The person is in a higher-risk group — over 65, under 5, pregnant, or has heart, kidney, or chronic illness. The bar for medical care is lower in these groups.

When in doubt, call. Heat exhaustion that is heading the wrong way is much easier to manage with help than after it has crossed into heat stroke.

A short version

If you remember nothing else, the home treatment for heat exhaustion is:

1. Get out of the heat.
2. Lie down, legs slightly raised.
3. Loosen clothing.
4. Cool actively — damp cloths, ice packs at neck/armpits/groin, fans, cool shower if steady enough.
5. Sip electrolyte fluids slowly.
6. Add food once nausea passes.
7. Watch for two to three hours; expect 24 to 72 hours of recovery.
8. Escalate to medical care for vomiting, confusion, worsening symptoms, very high temperature, or high-risk individuals.

Heat exhaustion and weather sensitivity

For migraine, headache, and pain-prone readers, the early symptoms of heat exhaustion — pressure-band headache, nausea, fatigue, brain fog — overlap heavily with what an oncoming migraine feels like. That overlap is part of why heat illness sometimes gets misread as "just a bad migraine day," and part of why a migraine on a hot afternoon can be hard to separate from low-grade heat illness. Tracking temperature, hydration, barometric pressure, humidity, and heat index alongside symptoms across a season is the cleanest way to see which days are heat days, which are pressure days, and which are both. The Pressure Pal app is built for that kind of multi-signal tracking, and summer is usually when it earns its keep.

Heat exhaustion, treated well and early, is one of the more manageable serious illnesses. The home treatment is not complicated, but it does have to be done — and done all the way through, not just for the first 10 minutes of feeling better.