How does sleep apnea damage your heart?
Sleep apnea repeatedly stops your breathing during sleep, which causes your blood oxygen levels to drop and your nervous system to jolt you awake. This cycle—intermittent hypoxia and autonomic fluctuation—puts direct stress on your cardiovascular system [6]. Over time, this stress contributes to high blood pressure, heart rhythm problems, and heart failure.
One large genetic study found that people with a genetic predisposition to OSA had a 26% higher risk of heart failure, a 24% higher risk of hypertension, and a 21% higher risk of atrial fibrillation (a common heart rhythm disorder) [2]. These effects were partly independent of obesity, meaning sleep apnea itself is a driver, not just a consequence of being overweight. Another study of nearly 4,000 people found that those with non-positional OSA (apnea that occurs in all sleep positions) had a 15% higher risk of future cardiovascular events compared to those with positional OSA [4], suggesting that more severe, persistent apnea is particularly harmful.
How much does sleep apnea increase your risk?
The risk increase is substantial and consistent across different types of studies. In a large analysis of over 200,000 people, OSA was linked to a 28% higher chance of having hypertension, a 46% higher chance of diabetes, and a 29% higher chance of cardiovascular disease [5]. These numbers were after adjusting for other risk factors like age, sex, and body mass index, meaning the apnea itself contributed to the risk.
For younger populations, the risk is even more striking. A study of nearly a million U.S. military veterans (median age 41) found that those with both insomnia and sleep apnea had a 2.4 times higher risk of developing hypertension and a 3.8 times higher risk of a cardiovascular event compared to those with no sleep disorder [3]. Even having sleep apnea alone doubled the risk of hypertension and more than tripled the risk of a cardiovascular event in this group [3].
What should you do if you have sleep apnea?
The bottom line is that sleep apnea is not just a nuisance—it's a treatable risk factor for heart disease. The American Heart Association recommends screening for OSA in people with resistant high blood pressure, pulmonary hypertension, and recurrent atrial fibrillation [6]. If you have any of these conditions and also snore loudly, wake up gasping, or feel exhausted during the day, a sleep study is a smart step.
Treatment works. In a recent clinical trial, the drug tirzepatide (a GLP-1 receptor agonist) reduced the number of apnea events per hour by about 25-29 events in people with moderate-to-severe OSA and obesity, and it also lowered their blood pressure and a key marker of inflammation (hsCRP) [1]. While CPAP (continuous positive airway pressure) is the standard treatment, this trial shows that addressing the underlying weight issue can dramatically improve both sleep apnea and cardiovascular risk factors. The key is to not ignore the condition—treating it can lower your heart disease risk.
About These Sources
This answer is built on 6 peer-reviewed studies — published from 2021 to 2025, 3 from 2024 or later, 3 in Q1 journals, collectively cited 1,716 times — selected as the most relevant from 11 studies that passed quality screening, drawn from 51 papers retrieved from a database of over 500 million.
Sources used in this answer
Tirzepatide for the Treatment of Obstructive Sleep Apnea and Obesity
In two phase 3 randomized controlled trials, tirzepatide reduced the apnea-hypopnea index by 20-24 events per hour more than placebo, and also lowered blood pressure and inflammation (hsCRP) in people with moderate-to-severe OSA and obesity.
Causal associations of obstructive sleep apnea with cardiovascular disease: a Mendelian randomization study
A Mendelian randomization study (genetic analysis) of over 200,000 people found that genetically predicted OSA causally increased the risk of heart failure by 26%, hypertension by 24%, and atrial fibrillation by 21%.
Insomnia, sleep apnea, and incidence of hypertension and cardiovascular disease.
In a cohort of 937,598 younger military veterans, co-morbid insomnia and sleep apnea was associated with a 2.4-fold higher risk of hypertension and a 3.8-fold higher risk of cardiovascular events compared to no sleep disorder.
Positional obstructive sleep apnea and cardiovascular outcomes.
In a study of 3,779 patients, those with positional OSA (apnea mainly when lying on their back) had a 15% lower risk of future cardiovascular events compared to those with non-positional OSA.
Association of obstructive sleep apnea with cardiometabolic diseases and cardiovascular mortality
In a large NHANES analysis, OSA was associated with a 28% higher risk of hypertension, a 46% higher risk of diabetes, and a 29% higher risk of cardiovascular disease, but not with increased all-cause or cardiovascular mortality.
Obstructive Sleep Apnea and Cardiovascular Disease: A Scientific Statement From the American Heart Association
The American Heart Association scientific statement reports that OSA prevalence is 40-80% in patients with hypertension, heart failure, coronary artery disease, and atrial fibrillation, and recommends screening in specific cardiac conditions.