Hypoxia literally means "a deficiency in oxygen." It can refer to: Hypoxia (medical), a shortage of oxygen in the body. Hypoxaemia is the reduction of oxygen specifically in the blood; anoxia is when there's no oxygen available at all. Environmental hypoxia, a condition in high altitudes such as mountains where the reduced partial pressure of oxygen available leads to hypoxia. Ischemia, a restriction in blood supply (and therefore oxygen supply) to an organ or section of the body, generally… (More on Hypoxia)