In the UAE's intense summer heat, heat stroke poses a life-threatening emergency, developing rapidly when the body's cooling system fails, often affecting the brain first. Doctors emphasize that the most critical warning sign is not sweating or thirst, but a sudden change in mental status, such as confusion, slurred speech, agitation, or fainting, which can occur within 10 to 15 minutes. Heat exhaustion, characterized by heavy sweating, weakness, dizziness, and nausea while remaining alert, is an early warning stage. Immediate action for suspected heat stroke includes moving the person to a cool place, calling emergency services if confusion or collapse occurs, and initiating rapid cooling with cold water or ice packs on key areas, while avoiding fluids by mouth if the person is confused. Prevention through regular hydration, avoiding peak heat hours, and wearing light clothing is paramount.