Study finds extreme heat worsens mental health and cognitive function and increases aggressive behavior

A research review finds extreme heat is linked to worse mental health, including mood instability, more depression and anxiety, and higher risks of aggression and self-harm.

Hot weather can also impair cognition, slowing reaction times and reducing working memory and other brain functions.

The risks are especially concerning for people with existing mental illness or those in vulnerable environments, making heat protection a public health priority.

The findings add to concerns that climate change and urban heat islands may worsen both physical and psychological health.