👉 Thermalexia, also known as thermal exhaustion or heat stroke, is a medical emergency where the body experiences extreme heat and dehydration due to prolonged exposure to high temperatures. It occurs when an individual's body temperature rises above 40°C (104°F) for more than three hours in direct sunlight. Symptoms include severe headache, confusion, nausea, vomiting, and muscle weakness or cramps. Treatment involves cooling the body with ice packs, water, or other cold fluids, as well