How Extreme Heat Harms Mental Well-Being
A study from the Climate Cares Centre at Imperial College London has uncovered a severe connection between extreme heat and mental health. After reviewing 83 national heatwave response plans worldwide, researchers found that just 31% even mention mental health, and only 22% include specific measures to protect it. More than half—78%—completely overlook this critical issue, putting countless lives at risk.
When temperatures soar, the body pumps out more cortisol, the primary stress hormone, which can trigger serious consequences. Heat also suppresses the parasympathetic nervous system—the part responsible for keeping us calm and emotionally balanced. Studies show that for every 1°C rise in temperature, mortality among people with mental disorders increases by 2.2%. In psychiatric hospitals, such as those in New York City, patients face twice the risk of death during heatwaves compared to the general population.
Ukraine’s Mental Health Challenge in the Heat
Ukraine, like many other countries, is grappling with the mental health toll of hot weather. Every 10°F increase in temperature is linked to a 4.8% rise in psychiatric emergency visits, highlighting a growing need for action. On the hottest days, emergency department visits for psychiatric reasons spike by 8%.
Dr. Alessandro Massazza notes that this is 'a concrete example of how mental health can be actively protected.'
The most vulnerable groups during heatwaves include people with pre-existing mental health conditions, children, residents of urban heat islands, and low-income populations. In densely built city areas, temperatures can be 2–10°C higher than in the suburbs. This extra heat can also impair cognitive function: when temperatures climb above 26–28°C, cognitive performance can drop by as much as 10%. Furthermore, 52% of people in the UK report sleep difficulties during hot weather, which only makes the problem worse.
Healthcare systems are not ready for these challenges. Psychiatric hospitals can become dangerous during heatwaves, as the demand for mental health services rises while facilities often lack proper cooling. Only 10% of countries have early warning systems that account for mental and psychosocial conditions.
Researchers suggest several strategies to improve the situation, including:
- Engaging young people in climate activism through Problem Focused Coping;
- Using Emotion Focused Coping based on cognitive behavioral therapy;
- Applying Meaning Focused Coping, rooted in Viktor Frankl’s logotherapy.
Key measures could include creating green spaces, cooling public areas, providing accessible public transport, and designing buildings for thermal comfort.
The Climate Cares study confirms that a 1°C rise in average daily temperature is associated with a 1.7% increase in global suicide rates. These findings demand urgent action on mental health—some steps, as Dr. Falk Feder points out, can be 'relatively inexpensive compared to the costs of emergency room visits.'
This research underscores the need to integrate mental health into extreme weather response plans. Ignoring this aspect can have devastating consequences for vulnerable populations. As global warming accelerates, it is critical to develop systems that address not only physical threats but also provide psychosocial support. Understanding how heat affects mental health can lay the groundwork for future health and social protection policies.
As the impact of extreme heat continues to escalate, recent events have also been affected, with significant climate gatherings being cancelled in London. This situation underscores the urgent need for nations to address not only the physical but also the mental health challenges posed by rising temperatures. For further insights into how these heatwaves are influencing climate discussions and health responses, read more about the cancellations of key climate events.