Short answer: Sleep apnea and testosterone are linked in both directions. Men with obstructive sleep apnea (OSA) tend to have lower testosterone, and the strongest shared driver is excess body fat, while repeated oxygen drops and broken sleep may also suppress the hormone signals that tell the testes to make testosterone. Treating apnea with CPAP alone has not reliably raised testosterone in studies, but weight loss helps both problems. Testosterone therapy can temporarily worsen sleep apnea, so guidelines advise against starting it while severe OSA is untreated.
Key Takeaways
- The link is real but tangled: meta-analyses find lower testosterone in men with OSA, and the gap is largest in severe apnea.[3]
- Obesity is the common thread: about half of people with obesity have OSA, and body fat lowers testosterone through several routes.[3]
- CPAP protects your heart and sleep, not necessarily your testosterone: a 2019 meta-analysis of 12 studies found no significant change in total testosterone after CPAP.[1]
- Testosterone therapy and OSA need care: the Endocrine Society recommends against starting testosterone therapy in untreated severe OSA, and some trials show short-term worsening of nighttime oxygen levels.[2][3]
- Diagnosis comes first: loud snoring, witnessed pauses, gasping and daytime sleepiness call for a sleep study; low energy and low drive call for a proper morning testosterone test.
What Is Obstructive Sleep Apnea?
Obstructive sleep apnea is a disorder in which the throat muscles relax during sleep and the upper airway narrows or closes. Breathing stops (an apnea) or becomes very shallow (a hypopnea), blood oxygen dips, and the brain briefly wakes you to reopen the airway. This can happen dozens of times an hour without you remembering it.
It is common in men. Mayo Clinic notes that men are 2 to 3 times more likely than premenopausal women to have OSA, and that risk climbs with excess weight, age, a family history, chronic nasal congestion and smoking.[4] One review cites prevalence estimates of about 15% in adult men, and as high as 34% of middle-aged men depending on how it is measured.[3]
Sleep apnea symptoms in men
According to Mayo Clinic, the classic signs fall into two groups.[4]
- At night: loud snoring, breathing pauses noticed by a partner, waking up gasping or choking, and getting up often to urinate.
- During the day: excessive sleepiness, dry mouth or sore throat on waking, morning headaches, trouble focusing, irritability or low mood, high blood pressure (especially if it needs several medicines), and decreased interest in sex.
That last symptom is one reason the overlap with low testosterone is so easy to miss. Many signs of low T (fatigue, low drive, poor focus, mood changes) look identical to the effects of fragmented sleep. Our guide to the signs of low testosterone covers the hormone side in more detail.
Does Sleep Apnea Cause Low Testosterone?
The evidence says OSA and low testosterone travel together, but how much apnea itself causes the drop is still debated.
What the studies show
A 2023 review in Frontiers in Reproductive Health summarized two meta-analyses. One pooled 24 case-control studies (1,268 patients and 745 controls) and found lower serum testosterone in people with OSA. Another pooled 18 studies (1,119 OSA patients and 704 controls) and found an inverse link between OSA and testosterone that held after accounting for body mass index and age, with notably lower levels in severe OSA.[3]
How apnea may lower testosterone
Researchers describe two pathways:[1][3]
- Direct: repeated low oxygen (intermittent hypoxia), night-time awakenings and fragmented sleep may suppress the brain’s release of GnRH and the pulses of luteinizing hormone (LH) that signal the testes to make testosterone.
- Indirect: obesity, insulin resistance and metabolic syndrome lower testosterone on their own. Fat tissue contains aromatase, which converts testosterone into estradiol, and estradiol in turn suppresses the hormones that drive testosterone production.[2]
The authors of a 2019 meta-analysis went further and argued that obesity, rather than OSA itself, is the more likely common factor, because treating the apnea alone did not change testosterone.[1] Both views agree on one practical point: body weight sits at the center of the problem.
Can Low Testosterone Cause Sleep Apnea?
The relationship runs both ways, but not in the direction most men expect. Low testosterone may reduce sleep efficiency and increase night-time awakenings.[3] However, the stronger concern in the research is the opposite: giving testosterone can make breathing during sleep worse in some men.
Proposed reasons include reduced activity of the muscles that hold the airway open, a higher metabolic demand for oxygen, a rise in red blood cell count (polycythemia), and a blunted brain response to low oxygen and high carbon dioxide.[2]
What the testosterone therapy trials found
| Study (as summarized in reviews) | Who was studied | What happened |
|---|---|---|
| Hoyos et al. | 67 obese men with severe OSA | Oxygen desaturation worsened by 10.3 events per hour at week 7; no difference from placebo by week 18[3] |
| Liu et al. | 17 men on high-dose testosterone | About 1 hour less total sleep and more breathing disruption[3] |
| Cole et al. (retrospective) | 3,422 testosterone users vs 3,422 controls | OSA developed in 16.5% of users vs 12.7% of controls[2][3] |
| Melehan et al. | 67 obese men with OSA | No effect on sleep quality after 12 weeks[2] |
| Shigehara et al. | 48 hypogonadal men | Sleep disturbances improved vs placebo at 12 months[2] |
The pattern suggests an early, dose-related worsening that may fade over time, but the trials are small and reviewers rate the overall evidence as low quality.[2][3]
Testosterone Therapy and Sleep Apnea: What Guidelines Say
Professional groups do not fully agree, which is why your doctor’s judgment matters:[3]
- Endocrine Society: recommends against starting testosterone therapy in men with untreated severe OSA, while calling OSA worsening an uncommon adverse effect.
- European Academy of Andrology: does not treat OSA as a contraindication, but suggests monitoring for hypoxia and sleep apnea during therapy.
- Italian societies (SIAMS/SIE): treated OSA is not an absolute contraindication.
Reviewers suggest that men on testosterone who develop apnea symptoms should have a sleep study, use CPAP if needed, and have the dose reduced or stopped if breathing does not improve. Lower-dose transdermal gel may be preferable in some cases, and respiratory monitoring is advised for men with obesity.[2][3]
How Sleep Apnea and Low Testosterone Are Diagnosed
The sleep study
OSA is confirmed with an overnight sleep study, either in a sleep lab (polysomnography) or with a simpler home sleep apnea test. Home tests are convenient but collect less data and may be less accurate.[5] The key number is the apnea-hypopnea index (AHI), the average number of breathing pauses and shallow-breathing events per hour of sleep.
| AHI (events per hour) | Adult severity (AASM) |
|---|---|
| Fewer than 5 | Normal |
| 5 to fewer than 15 | Mild |
| 15 to fewer than 30 | Moderate |
| 30 or more | Severe |
Source: Cleveland Clinic, citing American Academy of Sleep Medicine ranges.[5]
The testosterone test
Testosterone varies through the day and drops with poor sleep, so a single afternoon number can mislead. A morning blood draw, repeated if low, is the usual approach. See our guides on the best time to check testosterone levels and normal testosterone levels before you book the test. If you have both low testosterone symptoms and apnea warning signs, ask your doctor whether a sleep evaluation should come before any hormone treatment.
Treatment: CPAP, Weight Loss and Lifestyle
CPAP
Continuous positive airway pressure keeps the airway open with gentle air pressure through a mask and remains the standard treatment for moderate to severe OSA. For adults, the treatment goal is an AHI below 5.[5] Treating OSA matters because untreated apnea raises blood pressure and the risk of heart disease, stroke, irregular heartbeat and drowsy-driving accidents.[4]
On testosterone specifically, the results are disappointing. The 2019 meta-analysis by Cignarelli and colleagues pooled 12 studies with 388 men and found no significant change in total testosterone, free testosterone, LH or SHBG after CPAP.[1] Only three of those studies reported good CPAP adherence (at least 4 hours a night on 70% of nights), so poor use may have hidden some benefit.[1] Even so, CPAP is worth using for its proven effects on sleep and heart health.
Weight loss
Weight loss is the one strategy that targets both conditions. Reviews describe a linear association between weight loss and higher testosterone in men with obesity.[3] On the apnea side, the SURMOUNT-OSA trials tested the prescription medicine tirzepatide in 469 adults with obesity and moderate to severe OSA. After 52 weeks, AHI fell by 25.3 to 29.3 events per hour on the drug versus about 5 on placebo, alongside roughly 16% to 17% greater weight loss than placebo.[6] Diarrhea and nausea were the most common side effects. Whether medication, diet or surgery is right for you is a decision to make with your doctor.
Habits that support both sleep and hormones
- Ask your doctor about any sedatives or strong painkillers you use, since these can worsen breathing during sleep.[4]
- Stop smoking and treat chronic nasal congestion, both listed risk factors for OSA.[4]
- Keep a consistent sleep schedule; our sleep routines for men guide has a practical plan.
- Build regular exercise and strength training into your week to support weight loss, as the meta-analysis authors recommend.[1] For more, see how to increase testosterone naturally.
Who Should See a Doctor
Book an appointment if you snore loudly enough to disturb others, wake up gasping or choking, have pauses in breathing that a partner notices, or feel so drowsy that you doze off at work, in front of the TV or while driving.[4] Also see a doctor if you are considering testosterone therapy and have any of these signs, if you are already on testosterone and your snoring or sleepiness has worsened, or if your blood pressure is hard to control.
A Note on Supplements and Ultra Bann
No supplement is a substitute for a sleep study, CPAP or medical care for low testosterone. If you take any herbal product, tell your doctor and sleep specialist, especially before surgery or anesthesia. Ultra Bann is a herbal male vitality supplement by DL Bioproducts: one capsule every 2 days, with seven botanicals listed by amount on the label (Thai Butea superba, Panax ginseng, Cynomorium songaricum, black ginger, tongkat ali, epimedium and reishi, 800 mg in total). You can review the full ingredient label to share with your clinician, or see the product on the Ultra Bann shop page.
Frequently Asked Questions
Does sleep apnea cause low testosterone?
Men with OSA have lower testosterone on average, and levels are lowest in severe OSA. Oxygen drops and broken sleep may suppress the hormones that drive testosterone production, but obesity is a major shared cause, so apnea is often one contributor among several.[1][3]
Will CPAP raise my testosterone?
Probably not by itself. A meta-analysis of 12 studies found no significant change in testosterone after CPAP, although poor adherence in many studies limits that conclusion.[1] CPAP is still important for sleep quality, alertness and heart health.
Can testosterone therapy make sleep apnea worse?
It can, especially at high doses and in the first weeks of treatment. Some trials found worse nighttime oxygen levels early on that faded by about 18 weeks. That is why the Endocrine Society advises against starting therapy in untreated severe OSA.[2][3]
Can I take testosterone if I use CPAP?
Some guidelines say treated OSA is not an absolute barrier, but your doctor should decide and may recommend monitoring, a follow-up sleep study, or a lower dose.[3]
Should I get a sleep study before testing my testosterone?
If you have apnea warning signs (loud snoring, gasping, witnessed pauses, heavy daytime sleepiness), raise both issues with your doctor at the same visit. Diagnosing and treating OSA first can make testosterone results easier to interpret and is important before any hormone therapy.
References
- Cignarelli A, Castellana M, Castellana G, et al. Effects of CPAP on Testosterone Levels in Patients With Obstructive Sleep Apnea: A Meta-Analysis Study. Frontiers in Endocrinology. 2019;10. frontiersin.org
- La Vignera S, Calogero AE, Cannarella R, et al. Obstructive Sleep Apnea and Testosterone Replacement Therapy. Androgens: Clinical Research and Therapeutics. 2020;1(1):10 to 14. journals.sagepub.com
- Graziani A, Grande G, Ferlin A. The complex relation between obstructive sleep apnoea syndrome, hypogonadism and testosterone replacement therapy. Frontiers in Reproductive Health. 2023;5:1219239. pmc.ncbi.nlm.nih.gov
- Mayo Clinic. Obstructive sleep apnea: Symptoms and causes. mayoclinic.org
- Cleveland Clinic. Apnea-Hypopnea Index (AHI): What It Is and Ranges. 2025. my.clevelandclinic.org
- American College of Cardiology. Tirzepatide for the Treatment of Obstructive Sleep Apnea and Obesity (SURMOUNT-OSA). 2024. acc.org
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. This article is for information only and is not medical advice.
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