New! Sign up for our free email newsletter.
Reference Terms
from Wikipedia, the free encyclopedia

Obstructive sleep apnea

Obstructive sleep apnea (OSA) is a common sleep apnea caused by obstruction of the airway. It is characterized by pauses in breathing during sleep. These episodes, called apneas (literally, "without breath"), each last long enough that one or more breaths are missed, and occur repeatedly throughout sleep. In obstructive sleep apnea, breathing is interrupted by a physical block to airflow, despite the effort to breathe.

The individual with sleep apnea is rarely aware of having difficulty breathing, even upon awakening. Sleep apnea is recognized as a problem by others witnessing the individual during episodes or is suspected because of its effects on the body. Symptoms may be present for years, even decades without identification, during which time the sufferer may become conditioned to the daytime sleepiness and fatigue associated with significant levels of sleep disturbance.

Since the muscle tone of the body ordinarily relaxes during sleep, and since, at the level of the throat, the human airway is composed of walls of soft tissue, which can collapse, it is easy to understand how breathing can be obstructed during sleep. Although many individuals experience episodes of obstructive sleep apnea at some point in life, a much smaller percentage of people are afflicted with chronic, severe obstructive sleep apnea.

Many people experience elements of obstructive sleep apnea for only a short period of time. This can be the result of an upper respiratory infection that causes nasal congestion, along with swelling of the throat, or tonsillitis that temporarily produces very enlarged tonsils.

The Epstein-Barr virus, for example, is known to be able to dramatically increase the size of lymphoid tissue during acute infection, and obstructive sleep apnea is fairly common in acute cases of severe infectious mononucleosis.

Temporary spells of obstructive sleep apnea syndrome may also occur in individuals who are under the influence of a drug (such as alcohol) that may relax their body tone excessively and interfere with normal arousal from sleep mechanisms.

Related Stories
 


Health & Medicine News

September 12, 2025

Scientists discovered that a gut bacteria molecule called corisin can travel to the kidneys, triggering inflammation and scarring that lead to diabetic kidney fibrosis. By attaching to albumin in the blood, corisin infiltrates kidney tissue and ...
Researchers identified microRNA-93 as a genetic driver of fatty liver disease and showed that vitamin B3 can effectively suppress it. This breakthrough suggests niacin could be repurposed as a powerful new treatment for millions ...
Walking every day could be the simplest and most effective way to prevent chronic lower back pain. A large study involving over 11,000 people found that walking more — not faster — reduces the risk of developing long-term back issues. The ...
Forever chemicals known as PFAS have turned up in an unexpected place: beer. Researchers tested 23 different beers from across the U.S. and found that 95% contained PFAS, with the highest concentrations showing up in regions with known water ...
Researchers have discovered that everyday substances like caffeine can influence how bacteria such as E. coli respond to antibiotics. By examining 94 common drugs and food ingredients, scientists found that certain compounds trigger genetic ...
New research suggests that immunotherapy given before and after surgery could help patients with diffuse pleural mesothelioma, one of the most challenging cancers to treat. A phase II clinical trial tested immunotherapy in resectable cases, with ...
Researchers at NYU Langone Health discovered that cutting off blood flow accelerates cancer growth by prematurely aging the bone marrow and weakening the immune system. In mouse models, restricted blood flow doubled the growth rate of breast tumors, ...
Scientists in Canada have uncovered a surprising culprit behind high blood sugar and liver problems: a hidden fuel made by gut bacteria. This little-known molecule, called D-lactate, slips into the ...
Glioblastoma’s stealthy spread has met a new challenge: MRI-powered fluid flow mapping that reveals where the cancer is likely to invade next. The innovation is now being advanced by a spinoff company to guide personalized cancer ...
Scientists at Stellenbosch University have uncovered a rare class of plant compounds, flavoalkaloids, in Cannabis leaves for the first time. Using advanced two-dimensional chromatography and mass spectrometry, they identified 79 phenolic compounds ...
Metformin, long trusted for diabetes, turns out to work in the brain too. By shutting down Rap1 in the hypothalamus, the drug lowers blood sugar more effectively than previously understood, opening doors for new ...
What we eat as we age may determine how many chronic illnesses we face later in life. A 15-year study of more than 2,400 older adults reveals that diets rich in vegetables, whole grains, nuts, and healthy fats slow the accumulation of diseases like ...

Latest Headlines

updated 12:56 pm ET