Extreme or prolonged heat can worsen mood, impair cognition, and increase mental-health-related hospitalizations [1, 2].
These findings highlight a growing public health concern as rising temperatures stress physiological systems. The resulting disruption to sleep and mental stability can exacerbate existing psychiatric conditions and create new vulnerabilities in the general population [2, 3].
Psychiatrist Dr. Michael Ziffra of Northwestern Medicine said, "Intense heat inherently causes people to become more stressed and anxious" [3]. This stress stems from the body's effort to regulate its internal temperature, which puts pressure on multiple physiological systems [2, 4].
In the United Kingdom, temperatures recently reached highs close to 40 °C [5]. During this period, Google searches for "seasonal affective disorder" increased by 285% [5]. This suggests that extreme weather triggers a search for mental health resources even during summer months.
Health experts in Washington, D.C., noted that heat impacts more than just mood. A D.C. health expert said, "It can affect your attention, your cognition" [4]. These cognitive impairments can lead to indecisiveness and a diminished ability to focus on complex tasks.
Similar observations were made in the U.S. on Aug. 5, when heat affected downtown Fargo, North Dakota. A Sanford therapist said, "Hot weather can leave people feeling more irritable, angry, and indecisive" [2].
Researchers from the University of East Anglia and other global experts indicate that vulnerable populations are at the highest risk [1]. The combination of poor sleep and increased irritability creates a cycle that can lead to higher rates of emergency psychiatric admissions during heatwaves [1, 2].
“"Intense heat inherently causes people to become more stressed and anxious."”
The correlation between extreme temperature and mental health suggests that heatwaves should be treated as psychiatric emergencies as well as physical ones. As global temperatures fluctuate, the increased strain on cognitive function and emotional regulation may lead to a higher demand for mental health infrastructure during peak summer months.
