Quick answer
Heat stroke happens when the body's temperature rises to 40 °C (104 °F) or higher and can no longer cool itself. Signs like headache, dizziness, nausea, very hot skin, confusion, or fainting are warnings: with even one symptom, seek care immediately. Those most at risk are young children and older adults. It's prevented by drinking enough water, avoiding midday sun, and wearing light clothing. At AVA Médica we offer walk-in care 7 days a week.
This season's heat is no small matter. In 2026, heat stroke cases in the country rose 133% compared to the previous year, and in Coahuila health authorities asked that it be treated as an emergency. The good news is that it's completely preventable when you know what to do.
What is heat stroke?
It's what happens when the body overheats and can no longer cool itself down. It's considered heat stroke when the body temperature reaches 40 °C (104 °F) or higher. Unlike simply feeling overheated, it can be life-threatening, which is why it's treated quickly.
Warning signs
Just one of these signs is reason to seek medical care right away:
- A strong headache and dizziness.
- Very hot, flushed skin (may be dry or sweaty).
- Nausea or vomiting.
- Confusion, disorientation, or unusual behavior.
- Rapid heartbeat, cramps, or fainting.
Who's most at risk?
Children under 5 and older adults are the most vulnerable: in children the body doesn't yet regulate temperature well, and in older adults chronic conditions worsen the effect of heat. People with chronic illnesses and those who work outdoors also need extra care.
How to prevent it
- Drink water throughout the day, at least two liters, even if you don't feel thirsty.
- Avoid sun exposure between 11 a.m. and 4 p.m.
- Wear light, light-colored cotton clothing, and use sunscreen.
- Stay in cool, ventilated places and rest in the shade.
- Never leave children, older adults, or pets in a parked car, not even for a moment.
What to do at the first signs
If someone starts feeling dizzy, weak, or very hot, move them to a cool place, loosen their clothing, give them small sips of water, and cool their skin with damp cloths. If they don't improve quickly, or if confusion, vomiting, or fainting appears, seek medical care without delay.
We're close when you need us
At AVA Médica we offer walk-in care 7 days a week. If you or someone in your family shows signs of heat stroke, we can check them promptly and give you peace of mind.
This information is general and does not replace a medical consultation. Always consult your doctor for a personalized diagnosis and treatment.