(pathology) Hyperthermia is a medical problem. You get hyperthermia by getting too hot. Your body temperature gets too high. When your body gets hot enough, it cannot work the way it normally does.
The traveler got lost in the desert. By the time the rescue team found him in the evening, he had hyperthermia.
The rescue team treated the traveler's hyperthermia by giving him lemonade, and cooling the room, and making a shelter with a air conditioner inside to cool them down.
