Heat stroke is a medical emergency that occurs when the body's temperature regulation system fails, leading to an extremely high body temperature. It often happens in hot and humid weather or during intense physical activity without proper hydration or acclimatization. The symptoms of heat stroke include rapid heartbeat, dry skin, dizziness, confusion, headache, nausea, and sometimes seizures or loss of consciousness. If left untreated, it can cause damage to the brain, heart, kidneys, and other organs, leading to long-term health problems or even death. It is crucial to cool down the affected person rapidly by getting them into an air-conditioned space, removing their clothing if necessary, applying cold water or ice packs, and seeking immediate medical attention.