Men with obstructive sleep apnea (OSA) often have lower testosterone than men without it, but research suggests body weight, not the apnea itself, may be driving most of that link. A 2019 systematic review and meta-analysis in Frontiers in Endocrinology found that treating sleep apnea with CPAP did not produce a significant change in total testosterone. If you are hoping that fixing your sleep apnea will also fix low testosterone, the current evidence does not support counting on that.
If you have not been diagnosed with sleep apnea and are not sure whether your symptoms fit, our guide on men and sleep apnea risk, symptoms, and treatment options covers diagnosis and treatment in full. This article focuses specifically on the testosterone question.
When to Get Checked Promptly
Low testosterone symptoms and sleep apnea symptoms can overlap with other conditions that need medical attention, including thyroid problems and cardiovascular disease. Talk to a doctor promptly if you have chest pain, sudden severe shortness of breath, or other symptoms that feel urgent. Low testosterone and sleep apnea are both diagnosed with testing, not guesswork, so self-diagnosing either one is not a safe substitute for a doctor visit.
What the Research Actually Found
The 2019 Frontiers in Endocrinology review, from researchers at the University of Bari Aldo Moro in Italy, pooled data on OSA and testosterone in men. Here is what it found, in plain terms:
- Some association exists between OSA and lower testosterone. Studies included in the review found reduced testosterone and disrupted hormone signaling patterns associated with sleep fragmentation in men with OSA.
- Obesity looks like the bigger driver. When researchers adjusted for body mass index (BMI), the association between OSA and lower testosterone weakened. The review’s authors concluded the evidence leans toward obesity, not sleep apnea on its own, as the main factor behind the lower testosterone seen in many OSA patients.
- CPAP did not significantly raise testosterone. Across the pooled studies, CPAP use was not associated with a meaningful change in total testosterone. This held true both for men who started with low testosterone (hypogonadal) and men whose testosterone was already in a normal range (eugonadal).
Two Competing Explanations
Researchers have proposed two main explanations for why OSA and low testosterone show up together so often:
- Sleep fragmentation theory: Repeated drops in oxygen and constant sleep interruptions may reduce the hormone signals (from the brain to the testes) that drive testosterone production.
- Obesity theory: Excess body fat, especially visceral fat, can independently interfere with testosterone production, whether or not a person also has sleep apnea.
The review’s authors found the evidence leaned toward the obesity explanation carrying more weight than direct sleep disruption. That does not rule out a role for OSA itself, but it means low testosterone in a man with sleep apnea is not automatically “caused” by the apnea, and treating the apnea is not a reliable fix for the testosterone number on its own.
Correcting a Deficiency vs. Chasing a Number
This distinction matters for how you think about treatment:
- If you have diagnosed low testosterone (a real deficiency): that is a separate medical issue with its own evaluation and treatment path, decided with a doctor. Our guide on what testosterone test numbers mean and when to see a doctor walks through how that evaluation works.
- If your testosterone is already in a normal range: the review found CPAP did not raise testosterone in these men either. There is no evidence that treating sleep apnea will push an already-normal number higher.
Treating sleep apnea is worth doing for its own well-documented reasons (better sleep, lower cardiovascular risk from untreated OSA) rather than as a testosterone strategy.
Sleep Apnea and Testosterone: What to Do Next
- Get sleep apnea diagnosed properly if you have symptoms, through a doctor-ordered sleep study, not a wearable app alone.
- Get testosterone tested separately if you have symptoms of low testosterone, such as low energy, low sex drive, or mood changes. A blood test measures this directly.
- Discuss both results with your doctor rather than assuming one explains the other. They may be connected, partly connected through weight, or unrelated in your specific case.
- Follow your doctor’s treatment plan for each condition on its own terms, rather than expecting sleep apnea treatment to resolve a testosterone deficiency.
Extra Caution Groups
- Men with obesity, since the research suggests weight may explain more of the OSA-testosterone link than sleep apnea itself, and weight-related health risks compound with both conditions
- Men already diagnosed with low testosterone who also have sleep apnea symptoms, since the two need separate evaluation rather than one explanation
- Men considering testosterone therapy who have undiagnosed sleep apnea symptoms, since this is a conversation to have with a doctor before starting any hormone treatment
Evidence Limits
This article is based on one systematic review and meta-analysis published in 2019. The review itself noted real limits in the underlying research: only a small number of the included studies confirmed adequate CPAP use (at least 4 hours per night) when measuring testosterone outcomes, the studies varied widely in design, and research specifically focused on men with diagnosed low testosterone (hypogonadal men) was limited. Newer studies may add to or adjust this picture. This article does not cover every study on this topic, and it is not a substitute for individualized medical evaluation.
FAQ
Does sleep apnea cause low testosterone?
The evidence shows an association, but research suggests obesity may explain more of that link than sleep apnea on its own. It is not accurate to say sleep apnea directly causes low testosterone based on current evidence.
Will using a CPAP machine raise my testosterone?
Based on the available meta-analysis, CPAP use was not associated with a significant increase in total testosterone. CPAP is still valuable for treating sleep apnea itself and its cardiovascular risks, just not as a testosterone treatment.
Should I get tested for low testosterone if I have sleep apnea?
If you have symptoms of low testosterone, talk to your doctor about testing. Having sleep apnea does not confirm or rule out low testosterone, so a separate evaluation is the only way to know.
Can losing weight improve both sleep apnea and testosterone?
Weight plays a documented role in both conditions individually. Any weight management plan should be developed with a doctor based on your specific health situation, not started based on this article alone.
Educational Disclaimer
This article is for educational purposes only and is not medical advice. It summarizes findings from one published research review and is not a substitute for diagnosis or treatment from a qualified healthcare provider. Do not start, stop, or change any treatment, including CPAP use or testosterone therapy, based on this article. Talk to a licensed doctor about your specific symptoms and test results.