<Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Hypoxia is a condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level . Hypoxia may be classified as either generalized, affecting the whole body, or local, affecting a region of the body . Although hypoxia is often a pathological condition, variations in arterial oxygen concentrations can be part of the normal physiology, for example, during hypoventilation training or strenuous physical exercise . </P> <P> Hypoxia differs from hypoxemia and anoxemia in that hypoxia refers to a state in which oxygen supply is insufficient, whereas hypoxemia and anoxemia refer specifically to states that have low or zero arterial oxygen supply . Hypoxia in which there is complete deprivation of oxygen supply is referred to as anoxia . </P> <P> Generalized hypoxia occurs in healthy people when they ascend to high altitude, where it causes altitude sickness leading to potentially fatal complications: high altitude pulmonary edema (HAPE) and high altitude cerebral edema (HACE). Hypoxia also occurs in healthy individuals when breathing mixtures of gases with a low oxygen content, e.g. while diving underwater especially when using closed - circuit rebreather systems that control the amount of oxygen in the supplied air . Mild, non-damaging intermittent hypoxia is used intentionally during altitude training to develop an athletic performance adaptation at both the systemic and cellular level . </P>

A medical term which means a deficiency but not a total lack of oxygen