Mountain Fever

“And as [the emigrants] got to thinner air they encountered a new malady, a prostrating seizure of nausea and violent headaches, frequently complicated by still another kind of dysentery. Bryant, who was stricken with it, attributed it to excessive drinking of milk from cows which had been made unhealthy by overwork and had drunk alkali water and eaten noxious weeds. But it was really “mountain fever,” a process of adjustment to diminished oxygen which most people repeat today when they go to high altitudes.”