Hotter days, heavier minds: What climate change could mean for US mental health

Olivia Bennett
3 Min Read
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Hotter days, heavier minds: What climate change could mean for US mental health

Hotter days, heavier minds: What climate change could mean for US mental health
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Hotter days, heavier minds: What climate change could mean for US mental health
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Climate change is widely known to affect physical health—but new research suggests the mental health toll could be enormous. A study published in The Lancet Planetary Health projects that rising temperatures could lead to hundreds of millions to billions of additional anxiety and depression symptom-days each year across the United States, with the greatest burden falling on low-income communities and parts of Appalachia.

Using national mental health survey data and projections from multiple climate models, researchers estimate that 1–6°C of warming could result in:

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  • 401 million to 1.8 billion additional anxiety symptom-days annually
  • 329 million to 1.4 billion additional depression symptom-days annually
  • $24–$104+ billion per year in economic damages from these mental health impacts

The analysis draws on data from the Centers for Disease Control and Prevention’s Behavioral Risk Factor Surveillance System and climate projections used in the United States Environmental Protection Agency’s Climate Change Impacts and Risk Analysis framework.

Key findings:

  • Each additional degree of warming could add about one extra anxiety or depression day per person per year
  • Low-income Americans face significantly higher impacts
  • Appalachia is projected to experience the largest increases
  • Heat—not precipitation—is the main driver
Publication details

Anna Belova et al, Projecting and valuing climate change impacts on anxiety and depression in the contiguous USA: a damage function approach, The Lancet Planetary Health (2026). DOI: 10.1016/j.lanplh.2025.101426

Journal information:
The Lancet Planetary Health

Key medical concepts

Anxiety DisordersDepressionMental Healthheat exposure

Clinical categories

PsychiatryPsychology & Mental health

Citation:
Hotter days, heavier minds: What climate change could mean for US mental health (2026, March 10)
retrieved 11 March 2026
from https://medicalxpress.com/news/2026-03-hotter-days-heavier-minds-climate.html
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Olivia Bennett (she/her) is a health education specialist and medical writer dedicated to providing clear, evidence-based health information. She holds a strong academic background in public health and clinical sciences, with advanced training from respected institutions in the United States and the United Kingdom.   Bennett earned her Bachelor of Science in Public Health from the University of Michigan. She later completed her Doctor of Medicine (MD) at the Johns Hopkins University School of Medicine, where she developed a deep interest in preventive care and patient education.   To further strengthen her expertise in global and community health, she obtained a Master of Science in Global Health and Development from the University College London. She also completed a Postgraduate Certificate in Clinical Nutrition at the King's College London.   Since completing her studies, Bennett has worked in both clinical and health communication roles, contributing to medical blogs, health platforms, and public awareness campaigns. Her work focuses on translating complex medical research into practical guidance that everyday readers can understand and apply.   In 2021, she began specializing in digital health education, helping online health platforms maintain medically accurate, reader-friendly content. Her key areas of focus include: Preventive healthcare Women’s health Mental health awareness Chronic disease management (diabetes, hypertension) Nutrition and lifestyle medicine   Bennett believes that trustworthy health information should be accessible to everyone. Her goal is to empower readers to make informed decisions about their well-being through clear, compassionate, and research-backed guidance.   Outside of her professional work, she enjoys reading medical journals, participating in community wellness initiatives, and mentoring aspiring health writers.
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