Untreated sleep apnea: how it can affect your health
5 min read · Reviewed 2026-10-06
Short answer
Untreated obstructive sleep apnea is associated with high blood pressure, heart disease, stroke, type 2 diabetes, and daytime sleepiness that raises the risk of accidents. Diagnosis and treatment can improve sleep and daytime functioning, which is why getting screened matters.
What happens during the night
Each breathing pause can lower oxygen levels and briefly wake the brain. Repeated many times a night, this fragments sleep and puts stress on the heart and blood vessels.
Conditions linked to untreated OSA
- High blood pressure
- Heart disease, irregular heart rhythms and heart failure
- Stroke
- Type 2 diabetes and metabolic problems
- Mood changes and trouble concentrating
- Drowsy driving and workplace accidents
How common it is
Researchers estimate nearly a billion adults worldwide have obstructive sleep apnea, and in the U.S. most adults with it are thought to be undiagnosed.
The good news
Effective treatments exist, including CPAP, oral appliances, positional therapy, weight management and, for some people, surgery or implanted devices. A sleep specialist can help choose the right option after a diagnosis.
Sources
- National Heart, Lung, and Blood Institute (NIH) — Sleep Apnea
- National Heart, Lung, and Blood Institute (NIH) — Why Is Sleep Important?
- Benjafield et al., The Lancet Respiratory Medicine — Global prevalence and burden of obstructive sleep apnoea (2019)
- American Academy of Sleep Medicine (report by Frost & Sullivan) — Hidden Health Crisis Costing America Billions (2016)
This article is general education, not medical advice. Talk with a clinician about your situation.