Extreme heat is one of the deadliest weather-related health risks—and it’s getting worse. According to the World Health Organization, nearly half a million people die from heat-related causes each year. The elderly, people with chronic conditions, and those living in poor housing or working outdoors are especially vulnerable. Heat can worsen heart disease, diabetes, asthma, and mental health conditions—and in severe cases, lead to heatstroke, a medical emergency with a high fatality rate.
As climate change drives more frequent and intense heatwaves, WHO says action is needed now. That includes better early warning systems, local heat response plans, and practical steps—like staying hydrated, wearing loose clothing, and keeping homes cool. Checking in on neighbors and avoiding strenuous activity during peak heat can also help prevent illness. The WHO says many of these interventions are low-cost—and can save lives.
