Hypoxia means a lower than normal level of oxygen, and may refer to:

Reduced or insufficient oxygen

* Hypoxia (environmental), abnormally low oxygen content of the specific environment * Hypoxia (medical), abnormally low level of oxygen in the tissues ** Autoerotic hypoxia or erotic asphyxiation, intentional restriction of oxygen to the brain for sexual arousal **

Cerebral hypoxia Cerebral hypoxia is a form of hypoxia (reduced supply of oxygen), specifically involving the brain; when the brain is completely deprived of oxygen, it is called ''cerebral anoxia''. There are four categories of cerebral hypoxia; they are, in o ...

, a reduced supply of oxygen to the brain ** Diffusion hypoxia or Fink effect, a factor that influences the partial pressure of oxygen within the pulmonary alveolus ** Histotoxic hypoxia, the inability of cells to take up or use oxygen from the bloodstream ** Hypoxemic hypoxia or hypoxemia, a deficiency of oxygen in arterial blood **

Hypoxic hypoxia Generalized hypoxia is a medical condition in which the tissues of the body are deprived of the necessary levels of oxygen due to an insufficient supply of oxygen, which may be due to the composition or pressure of the breathing gas, decreased lu ...

, a result of insufficient oxygen available to the lungs **

Intrauterine hypoxia Intrauterine hypoxia (also known as fetal hypoxia) occurs when the fetus is deprived of an adequate supply of oxygen. It may be due to a variety of reasons such as prolapse or occlusion of the umbilical cord, placental infarction, maternal diab ...

, when a fetus is deprived of an adequate supply of oxygen **

Generalized hypoxia Generalized hypoxia is a medical condition in which the tissues of the body are deprived of the necessary levels of oxygen due to an insufficient supply of oxygen, which may be due to the composition or pressure of the breathing gas, decreased lu ...

is hypoxia distributed amongst all tissues **

Latent hypoxia Latent hypoxia is a condition where the oxygen content of the lungs and arterial blood is sufficient to maintain consciousness at a raised ambient pressure, but not when the pressure is reduced to normal atmospheric pressure. It usually occurs wh ...

is artificially raised oxygen concentration in the blood due to high ambient pressure and will reduce when the pressure is reduced to normal, associated with freediving blackout. **

Pseudohypoxia Pseudohypoxia refers to increased cytosolic ratio of free NAD to NADH in cells, caused by hyperglycemia.
Diabetes Ma ...

, increased cytosolic ratio of free NADH to NAD⁺ in cells **

Tumor hypoxia Tumor hypoxia is the situation where tumor cells have been deprived of oxygen. As a tumor grows, it rapidly outgrows its blood supply, leaving portions of the tumor with regions where the oxygen concentration is significantly lower than in health ...

, the situation where tumor cells have been deprived of oxygen *

Hypoxia in fish Fish are exposed to large oxygen fluctuations in their aquatic environment since the inherent properties of water can result in marked spatial and temporal differences in the concentration of oxygen (see oxygenation and underwater). Fish respond ...

, responses of fish to hypoxia

Music

* ''Hypoxia'' (Kathryn Williams album), 2015 album * "Hypoxia" (Benn Jordan song), a 2008 ambient song * "Hypoxia" (Delerium song), a 1994 electronica song * "Hypoxia", a 2011 song from ''Pulse'' (Thomas Giles album) {{disambig