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.

Oil drilling rig silhouetted against a red sunset sky.

Canada announces new methane emission standards for oil and gas sector

The new rules, which will take effect in 2028, aim to cut emissions by 75% by 2035.

people gathered outside buildings holding Climate Justice Now signage.

Here's the global playbook being used to crack down on climate protest

A new study finds that repression of environmental protest is rising worldwide and Indigenous land defenders face the greatest risk.
Greenpeace ship in port.

Greenpeace’s fight with pipeline giant exposes a legal loophole

A court filing by a group with deep ties to the pipeline company Energy Transfer raises questions about the growing use of amicus briefs in litigation.
burgers and fries inside box.

Ultra-processed diets drive obesity and climate change — but solutions are within reach

Diets around the world dependent on ultra-processed foods and animal-based agriculture are driving obesity rates and climate change, but solutions exist that would bolster health, and save money and the planet, according to a new review. 
skyline photography of nuclear plant cooling tower blowing smokes under white and orange sky at daytime.

India's Parliament approves bill to open civil nuclear power sector to private firms

India’s Parliament has approved new legislation to open the civil nuclear power sector to private companies.

Portrait of President Donald Trump with American flag in background.

The year the US doubled down on critical minerals

In 2025, the list of metals became a top priority under President Trump. But what even are they?

A river running through a canyon surrounded by mountains.

The brawl over the Colorado River is about more than water

The lifeblood of the West is drying up — and scrambling state and local politics.
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.