Extreme Heat Linked to Mental Health Hospital Admissions in Young People

Research indicates that extremely high temperatures during warmer months can double the likelihood of young individuals being hospitalized for mental health issues.

The study analyzed 720,000 hospital admissions in New South Wales for those aged 24 and younger, suggesting that the ongoing climate crisis may worsen the already troubling mental health trends among youth.

As extreme temperatures become more frequent due to climate change, experts predict an increase in heat-related hospital admissions by approximately 6% to 7.7% by century’s end.

Dr. Wen‑Qiang He, who led the research at the University of Sydney, noted that “as temperatures rise, we see a significant increase in admissions among younger populations. The risk doubles in warmer months and even triples during colder months.” This is something that we really need to acknowledge.

Dr. He emphasized the importance of awareness in the community, suggesting that understanding these trends can help support young people more effectively.

The findings were published in the Journal of the American Academy of Child and Adolescent Psychiatry and examined young people’s hospital admissions from 2001 to 2022 for various mental health disorders—including depression, schizophrenia, and self-harm.

When daily temperatures reached the highest 1% for that day, the data revealed that the risk of hospitalization doubled during the warmer months between October and March, while it tripled during the cooler seasons.

Previous studies have reported that in New South Wales, young people more frequently present with suicidal thoughts on hotter-than-average days.

The National Climate Risk Assessment issued last year linked extreme heat to “higher rates of suicide and mental health-related hospital admissions,” pointing to increased stress and anxiety as contributing factors.

While this new research didn’t delve into the reasons behind the correlation between high temperatures and increased hospitalizations, the authors speculated on several possible explanations. For instance, elevated temperatures might affect brain function directly and subsequently impact mental health.

Another angle to consider is how unexpected temperature swings, such as those seen in winter, might alter individuals’ stress responses, sleep patterns, and overall mood.

Dr. Cybele Dey, an adolescent psychiatrist and co-author of the study, remarked that the quick response—little time lag between temperature spikes and hospital admissions—suggests some kind of physiological reaction to heat.

“These aren’t just mild cases. A lot must be going wrong for someone to need hospitalization,” she explained. And it’s clear that climate change is already posing challenges to the mental health of children and young adults.

Dr. Hasini Gunasiri, a research fellow at Orygen, a youth mental health organization, underscored the practical implications of these findings for caring for young individuals.

Gunasiri, who wasn’t part of the research, pointed out that during extreme heat, young people often resort to alcohol or substances to manage discomfort, irritability, and emotional distress. This behavior can lead to impulsivity or even self-harm, as poor sleep exacerbates these risks.

“Existing heat-health policies usually focus on physical health problems like heatstroke or dehydration, particularly in older adults,” she noted. “This study highlights that mental health considerations should also be integrated into planning for extreme heat, especially for younger populations.”

Incorporating mental health awareness into heat-related warnings could be an effective way to raise awareness among healthcare professionals and families about the potential mental health consequences of extreme temperatures.