This is a method for curing fever I read about in Ayurvedic medicine: drinking a cup of hot water (cooled to room temp) dissipates the heat. It seems illogical but works on a like-to-like level, where heat removes heat. So I tried it: I boiled a cup of water and added a bit of cool water so I could drink it right away without waiting. After 20 minutes of consuming it, I felt a wave of heat leaving my body. It was unusual but effective!
If I remember correctly, in Ayurvedic medicine, fevers originate in the stomach, which could be why this is effective. Hope it helps someone else!