Emergency psychiatric services in Paris were at full capacity this summer, including during the month of August, a time typically marked by fewer cases due to vacation periods. This unusual situation has raised concerns among healthcare professionals about the impact of extreme weather on mental health. Marine Akkaoui, a psychiatrist working at the Sainte-Anne hospital center and also with the Paris SAMU (Service d'Aide Médicale Urgente), highlighted the potential effects of heatwaves on the brain. She explained that prolonged exposure to high temperatures can lead to physical stress, which in turn may exacerbate or trigger mental health issues such as anxiety, depression, and even psychosis in vulnerable individuals. Heatwaves can cause dehydration, sleep disturbances, and increased stress levels, all of which can negatively affect cognitive function and emotional regulation. These factors may contribute to a rise in psychiatric emergencies, especially among those who already have pre-existing mental health conditions. The situation in Paris this summer underscores the growing need for public health strategies that address both physical and mental health during extreme weather events. As climate change leads to more frequent and intense heatwaves, understanding their impact on mental health becomes increasingly important for developing effective interventions and support systems.