PULIC HEALTHExtreme Heat Will Cost the U.S. $1 Billion in Health Care Costs — This Summer Alone

By Zoya Teirstein

Published 29 June 2023

Extreme heat — summertime temperatures and humidity that exceed the historical average — is being made more frequent and intense by climate change. High temperatures could lead to 235,000 ER visits and 56,000 hospital admissions for heat-related conditions annually.

Extreme heat — summertime temperatures and humidity that exceed the historical average — is being made more frequent and intense by climate change. In the first two weeks of June, a late-spring hot spell prompted schools in the Northeast, Mid-Atlantic, and Great Lakes areas to close or send students home early. A heat wave broke temperature records in Puerto Rico — the heat index, a measure of how temperatures feel to the human body, reached 125 degrees Fahrenheit on parts of the island. And extreme heat spurred deadly storms and power outages for hundreds of thousands of customers from Texas to Louisiana.

All that heat is bad for human health and leads to a rise in hospitalizations for cardiovascular, kidney, and respiratory diseases, particularly among the urban poor, who often lack access to air conditioning and green spaces. Those hospitalizations will come with a hefty price tag. A new report from the public policy research group Center for American Progress estimates extreme heat will create $1 billion in health care-related costs in the United States this summer. The analysis, provided exclusively to Grist, projects that excessive heat will spur nearly 235,000 emergency department visits and more than 56,000 hospital admissions for conditions related to increased body temperature across the country this summer. 

“As the number of heat-event days increases, the probability that people are going to get rushed to the emergency room or get hospitalized increases,” said Steven Woolf, a senior fellow at the Center for American Progress, a professor of family medicine and population health at Virginia Commonwealth University School of Medicine, and a coauthor of the report. “We were interested in trying to quantify how big a risk that is.” 

Woolf and a cohort of academics, scientists, and doctors from Virginia Commonwealth University analyzed health insurance claims in Virginia during the 80 extreme heat days that occurred in the state, on average, every summer from 2016 and 2020. The claims were filed for emergency room visits, hospital admissions, and other medical care. They used that data to determine how many Virginians sought a doctor’s help during these heat waves compared to other days. The authors tallied up “heat-related illnesses,” defined as including heat cramps, heat exhaustion, and heat stroke, as well as “heat-adjacent illness” — dehydration, rapid pulse, dizziness, or fainting.