As global temperatures continue to break records year after year, scientists are raising fresh concerns about a less visible but deeply troubling consequence of extreme heat—its impact on adolescent mental health. New research from the University of Denver suggests that rising temperatures may be contributing to increased risks of depression among teenagers.
The past decade has seen a consistent upward trend in global temperatures, with recent winters in parts of the United States reaching historic highs. Several states, including Colorado, recorded their warmest winters on record, while others experienced near-record conditions. Experts warn that such extreme heat events are not only affecting physical health but may also be influencing emotional and psychological well-being.
Leading the research, Erika Manczak, an associate professor of psychology, is investigating how environmental stressors like heat exposure can affect mental health, particularly among children and adolescents. Her work explores both biological and social pathways through which rising temperatures may increase vulnerability to depression.
“Extreme heat places stress on the body, potentially triggering biological responses such as inflammation, which has been linked to depressive symptoms,” Manczak explained. Researchers believe that this physiological response could be one of the mechanisms connecting temperature extremes to mental health challenges.
Between 2020 and 2025, the research team conducted a detailed study involving 120 teenagers in the Denver metropolitan area. Participants were monitored over a six-month period across different seasons. The study combined clinical assessments of depressive symptoms with blood tests to measure inflammation levels, alongside temperature data linked to each participant’s residential location.
By analysing historical weather patterns, researchers identified periods of unusually high or low temperatures and examined how these fluctuations correlated with changes in mental health. Their findings suggest that an increase in the number of extreme temperature days may predict a rise in depressive symptoms in the following month.
Adolescence is already considered a high-risk period for the onset of depression, with estimates suggesting that a significant proportion of teenagers experience depressive symptoms. Researchers note that young people may be particularly vulnerable to heat-related stress due to increased outdoor exposure and limited control over their environments, such as access to cooling systems.
The study also highlights the importance of considering environmental factors alongside traditional influences like social relationships and life stressors. Manczak emphasized that integrating climate-related exposures into mental health research could open new pathways for prevention and intervention.
As climate change continues to intensify, the findings underscore the urgency of understanding how environmental conditions shape mental health outcomes. Researchers hope the evidence will inform public policy and encourage measures aimed at reducing heat exposure, particularly among vulnerable populations like children and adolescents.
The study adds to a growing body of research indicating that climate change is not only an environmental and economic issue but also a significant public health challenge. Experts say that addressing extreme heat through climate action and urban planning could play a crucial role in safeguarding the mental well-being of future generations.