Extreme Heat Impacts Mental Health and Brain Function, Experts Warn

Recent studies reveal that extreme heat significantly affects emotional functioning, even in individuals without mental health disorders. While summer is often associated with joy and relaxation, high temperatures can cause irritability, sleep difficulties, reduced energy, concentration problems, and mood declines. This phenomenon, known as Summer Seasonal Affective Disorder (Summer SAD), is less common than winter depression but highlights how weather influences brain and mental health.

Prolonged heat forces the body to work harder to cool down, impacting the brain’s ability to concentrate, make decisions, and regulate emotions. Many experience mental fatigue and reduced patience after hot days. Additionally, hot summer nights disrupt sleep quality, leading to difficulty falling asleep, frequent awakenings, and less deep sleep. Since sleep is crucial for brain recovery, ongoing poor sleep can worsen mood and stress management.

Longer daylight hours also affect the biological clock, altering hormone secretion and sleep-wake cycles, which can further impair sleep and emotional regulation. Unlike winter depression, Summer SAD symptoms include increased irritability, restlessness, anxiety, decreased appetite, and mood drops.

Experts advise maintaining a consistent sleep routine, cooling bedrooms, staying physically active during cooler hours, socializing despite the heat, staying hydrated, avoiding prolonged sun exposure, and keeping a regular daily schedule. With climate change expected to increase the frequency and intensity of heat waves, understanding heat’s impact on mental health is becoming a growing public health challenge.

Professor Eyal Fruchter, chair of the National Council for Post-Trauma and head of mental health at Pami, emphasizes the importance of recognizing and addressing these heat-related mental health signals rather than dismissing them as mere discomfort.