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

Reduced or insufficient oxygen

Hypoxia (environmental) Hypoxia (''hypo'': 'below', ''oxia'': 'oxygenated') refers to low oxygen conditions. Hypoxia is problematic for air-breathing organisms, yet it is essential for many anaerobic organisms. Hypoxia applies to many situations, but usually refers t ...

, abnormally low oxygen content of a specific environment **

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 t ...

, responses of fish to hypoxia *

Hypoxia (medical) Hypoxia is a condition in which the body or a region of the body is deprived of an adequate oxygen supply at the tissue (biology), tissue level. Hypoxia may be classified as either ''Generalized hypoxia, generalized'', affecting the whole body, ...

, abnormally low level of oxygen in the tissues **

Autoerotic hypoxia Erotic asphyxiation (variously called asphyxiophilia, hypoxyphilia or breath control play) is the intentional restriction of oxygen to the brain for the purposes of sexual arousal. With a partner (or alone), the act often involves strangulatio ...

or erotic asphyxiation, intentional restriction of oxygen to the brain for sexual arousal **

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

, 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 alveoli ** Histotoxic hypoxia, the inability of cells to take up or use oxygen from the bloodstream **

Anemic hypoxia Hypoxia is a condition in which the body or a region of the body is deprived of an adequate oxygen supply at the tissue level. Hypoxia may be classified as either '' generalized'', affecting the whole body, or ''local'', affecting a region of t ...

, Blood is not able to take sufficient amount of oxygen due to Anemia ** **

Hypoxemic hypoxia Hypoxemia (also spelled hypoxaemia) is an abnormally low level of oxygen in the blood. More specifically, it is oxygen deficiency in arterial blood. Hypoxemia is usually caused by pulmonary disease. Sometimes the concentration of oxygen in the ...

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 dia ...

, 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 a condition that mimics hypoxia, by having sufficient oxygen yet impaired mitochondrial respiration due to a deficiency of necessary co-enzymes, such as NAD+ and TPP. The increased cytosolic ratio of free NADH/NAD+ in cel ...

, 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 healt ...

, the situation where tumor cells have been deprived of oxygen

Music

* ''Hypoxia'' (album), by Kathryn Williams, 2015 * ''Hypoxia'', an album by

Projected Projected is an American rock supergroup consisting of Sevendust members John Connolly and Vinnie Hornsby, Alter Bridge and Creed drummer Scott Phillips, and former Submersed and current Tremonti guitarist Eric Friedman. The band released the ...

, or the title song, 2022 * "Hypoxia", a song by Delerium from '' Spheres 2'', 1994 * "Hypoxia", a song by Thomas Giles from ''

Pulse In medicine, the pulse refers to the rhythmic pulsations (expansion and contraction) of an artery in response to the cardiac cycle (heartbeat). The pulse may be felt ( palpated) in any place that allows an artery to be compressed near the surfac ...

'', 2011 {{disambiguation