06/09/2026
Heating Up for Summer
When it comes to extreme heat, it’s not just about the temperature you see on your weather app. While 120 degrees in Phoenix isn’t great, 90 degrees in New York can be worse.
This is because the risk to your health is due to heat imbalance. That’s when your body produces more heat than it can release. Normally, sweat helps cool us down. But when it’s hot and humid, sweat doesn’t evaporate as easily. The air is already packed with moisture, making it harder for your body to cool itself and raising the risk of illness quickly.
• People taking medications that impair heat regulation: Certain drugs interfere with sweating, hydration, or heart function, and can even reduce your thirst sensation. Check out the list here.
• Older adults: Aging reduces the body’s ability to sweat and regulate temperature.
• Infants and children: Smaller bodies heat up faster, and young children may not recognize or communicate early symptoms. Kids with asthma are at high risk.
• People with chronic diseases: Underlying conditions like heart disease strain the body’s ability to cope with heat stress.
• Pregnant women: Pregnancy increases metabolic heat production, making it harder to stay cool. More here.
• Outdoor workers and athletes: Prolonged physical activity in hot environments increases internal heat production.
Check the Heat Risk tool, https://ephtracking.cdc.gov/Applications/HeatRisk/?utm_source=substack&utm_medium=email
to know when to avoid strenuous activity. Stay hydrated. Watch for signs and symptoms of heat stroke. Check your urine color.
Be smart with fans: Fans can help when it’s moderately hot by circulating air and helping sweat evaporate. But once temps climb above 90°F fans may actually blow more hot air onto you, increasing heat stress.