How does heat kill? It confuses your brain, overworks your heart, shuts down your organs

FILE - A man pours cold water onto his head to cool off on a hot day in the Mediterranean Sea in Beirut, Lebanon, July 16, 2023. As temperatures and humidity soar outside, what's happening inside the human body can become a life-or-death battle. People sit in front of a table fan to cool off on a hot summer afternoon in Varanasi, India, May 29, 2024. FILE - An elderly woman suffering from a heat-related ailment is brought to a government district hospital in Ballia, Uttar Pradesh state, India, June 20, 2023.

As temperatures and humidity soar outside, what's happening inside the human body can become a life-or-death battle decided by just a few degrees.