Summer depression linked to heatwaves raises concerns worldwide

Doctors warn that seasonal affective disorder, traditionally associated with winter, is increasingly reported during hot summer months. Extreme temperatures and long, warm nights disrupt melatonin and serotonin production, leading to anxiety, insomnia, loss of appetite and severe sadness. A recent study estimates that summer‑type seasonal depression affects about 0.57 % of the global population, while the broader Lancet analysis notes that roughly 1.2 billion people worldwide lived with a mental‑health condition in 2023. Experts advise staying hydrated, limiting exposure to heat, maintaining regular sleep‑wake routines and seeking professional help if symptoms persist.

The phenomenon has been highlighted in health reports from Japan and Romania, underscoring its relevance across diverse regions as heatwaves become more common.