Increasing emergency room visits due to heat illness in 2023

Last year saw a significant rise in ER visits related to heat illnesses across the U.S., a CDC study finds.

Noah Weiland reports for The New York Times.


In short:

  • Data from 2023 shows a notable increase in heat-related illnesses, primarily from May to September, with nearly 120,000 recorded ER visits.
  • Southern states, particularly Arkansas, Louisiana, New Mexico, Oklahoma and Texas, experienced the highest rates of heat-related visits.
  • Men and adults aged 18-64 were the most affected groups, suggesting specific demographic vulnerabilities to heat effects.

Key quote:

"The heat you were asked to manage 10 years ago is not the heat you’re being asked to manage today."

— Kristie L. Ebi, University of Washington professor

Why this matters:

Heat illnesses range from mild conditions like heat rash and heat cramps to more severe forms such as heat exhaustion and heat stroke, the latter of which can be life-threatening. Those who work outdoors can be particularly vulnerable. Urban areas are particularly vulnerable due to the "urban heat island" effect, where buildings and roads absorb and re-emit the sun’s heat more than natural landscapes such as forests and bodies of water. This can make cities several degrees warmer than their rural surroundings, increasing the risk of heat-related illnesses for city dwellers.

For more: Worsening heat waves are hammering the disabled community.

A row of wind turbines alongside a field

The real economic impact of clean energy

US energy chief Chris Wright claims that renewable energy is dragging down Europe's economy. Is that true?
Power plant with smoke and dirty orange air.
Credit: Mikhail Dudarev/BigStock Photo ID: 14021453

Study: 2025 emissions rise due to Trump-era policies

Emissions of sulfur dioxide increased by 18% in 2025, according to an analysis of U.S. Environmental Protection Agency data by the Natural Resources Defense Council, an environmental advocacy group.

The U.S. capitol building

Trump's climate silence at the longest-ever State of the Union

The president’s far-reaching speech ignored climate change but not its impacts.
Illustration depicting pumpjacks vs solar panels & wind turbines
Credit: MIRO3D/BigStock Photo ID: 147195269

The culture war is coming for your electricity

Utah Republicans are calling for an energy "divorce" from blue states. A major utility just granted part of their wish.
Portable balcony solar panel

Balcony solar is taking state legislatures by storm

In more than half of U.S. states, Republican and Democratic lawmakers have introduced legislation that would boost adoption of DIY solar systems.
A closeup of pieces of wheat bread

Breadcrumbs (literally) lay path away from fossil fuels

Researchers have developed a carbon-negative method for hydrogenation that uses bacteria fed on waste bread to generate hydrogen for chemical reactions.

Refinery and petrochemical industrial plant
Credit: Tee Theerapol/BigStock Photo ID: 60783539

An oil refinery defined life in this quaint California city. What happens when it’s gone?

For decades, the Valero refinery shaped Benicia’s economy, politics and health. Now the city has become a reluctant test case of whether an oil town can reinvent itself
From our Newsroom
Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

One facility has emitted cancer-causing chemicals into waterways at levels up to 520% higher than legal limits.

Regulators are underestimating health impacts from air pollution: Study

Regulators are underestimating health impacts from air pollution: Study

"The reality is, we are not exposed to one chemical at a time.”

Pennsylvania governor Josh Shapiro speaks with the state flag and American flag behind him.

Two years into his term, has Gov. Shapiro kept his promises to regulate Pennsylvania’s fracking industry?

A new report assesses the administration’s progress and makes new recommendations

silhouette of people holding hands by a lake at sunset

An open letter from EPA staff to the American public

“We cannot stand by and allow this to happen. We need to hold this administration accountable.”

wildfire retardants being sprayed by plane

New evidence links heavy metal pollution with wildfire retardants

“The chemical black box” that blankets wildfire-impacted areas is increasingly under scrutiny.

Stay informed: sign up for The Daily Climate newsletter
Top news on climate impacts, solutions, politics, drivers. Delivered to your inbox week days.