Sleep Apnea Secondary to Hypertension

If your hypertension is service connected and a sleep study has diagnosed sleep apnea, you can claim the sleep apnea as secondary to the hypertension. Be clear-eyed about it first. Most of the research runs the other way, with sleep apnea driving blood pressure up, and a VA examiner will know that. This direction is hard to support as cause. It is more realistic as aggravation, especially if your blood pressure resists treatment. This page explains what the evidence does and does not support, how aggravation works, and what VA would need to grant the claim.

Can hypertension cause sleep apnea?

The plain answer: no study I found shows that high blood pressure starts sleep apnea in the general population. What the research does contain is a narrower finding, from small studies, suggesting that fluid retention tied to hard-to-control hypertension can make sleep apnea worse.

The research mostly runs the other way

In the Wisconsin Sleep Cohort (Peppard and colleagues, New England Journal of Medicine, 2000), 709 adults had overnight sleep studies and were checked again four years later. The more breathing events per hour at the start, the more likely they were to have hypertension at follow-up. People with 15 or more events an hour had 2.89 times the odds of people with none, after adjusting for whether they had hypertension at the start, body mass index, neck and waist size, age, sex, alcohol and smoking. The authors concluded that sleep-disordered breathing is likely a risk factor for hypertension.

What supports hypertension making sleep apnea worse

• A 2016 meta-analysis of 11 studies (Khurshid and colleagues, Journal of Clinical Sleep Medicine) found that blood pressure medicines lowered breathing events by 5.69 an hour on average, and by 14.52 an hour in studies of diuretics, which clear extra fluid. The authors called the reduction statistically significant but small, and the studies relatively small and short. They also wrote that increasing evidence suggests hypertension worsens sleep apnea.
• A study of 25 people with drug-resistant hypertension and 15 with controlled hypertension (Friedman and colleagues, Hypertension, 2010) found more severe sleep apnea in the drug-resistant group (43.0 against 18.1 events an hour). In both groups, apnea severity rose with the amount of fluid that moved out of the legs overnight, and neck size grew more overnight in the drug-resistant group. The authors concluded that fluid shifting toward the upper body during sleep accounts for the high rate of sleep apnea in drug-resistant hypertension.
• In 12 patients with resistant hypertension and sleep apnea (Gaddam and colleagues, Journal of Human Hypertension, 2010), adding spironolactone, a drug that blocks the hormone aldosterone, for eight weeks cut breathing events from 39.8 to 22.0 an hour. Weight and blood pressure also fell, the study was open-label with no comparison group, and the authors called it preliminary.
• A randomized study of 30 patients with resistant hypertension and moderate-to-severe sleep apnea (Yang and colleagues, Clinical and Experimental Hypertension, 2016) found that 12 weeks of spironolactone lowered apnea severity, blood pressure and aldosterone significantly more than in the control group.

What this means for your claim

• Causation is hard. An opinion that your hypertension caused your sleep apnea needs a mechanism in your records, not just the fact that the two conditions often occur together.
• Aggravation is more realistic when your records show resistant hypertension (in the Gaddam study, blood pressure of 140/90 or higher despite three or more medicines including a thiazide diuretic), fluid retention or swelling, high aldosterone, or apnea that got worse when your blood pressure control got worse.
• The research gives little support if your blood pressure is controlled on one medicine and nothing in your file points to fluid retention.

How VA decides sleep apnea secondary to hypertension

Secondary service connection is in 38 CFR § 3.310. VA grants it in two ways.

• Caused by. Your service-connected hypertension caused the sleep apnea, at least as likely as not.
• Aggravated by. Your sleep apnea is aggravated by your service-connected hypertension, meaning it would be less severe but for the hypertension (M21-1 V.ii.2.D). VA rates only the part above the baseline, so the opinion should describe the baseline.

The file needs a sleep study diagnosis, service-connected hypertension, and a medical opinion that links the two with reasoning. Hypertension itself must be confirmed by readings taken two or more times on at least three different days (Note 1 to Diagnostic Code 7101).

The baseline question

VA needs a baseline from medical evidence. Under 38 CFR § 3.310(b), it can come from medical evidence created before the worsening began, or from the earliest medical evidence created after it began. The regulation also mentions natural progress, but VA's current manual, M21-1 V.ii.2.D, no longer applies that part, and the worsening does not have to be permanent. VA rates the current level minus the baseline. Earlier sleep studies and CPAP records are the usual baseline evidence.

A Board grant, read carefully

In Board citation 25003137 (March 5, 2025), the Board granted sleep apnea secondary to hypertension after VA tried three times to get an adequate opinion. VA's examiner said the literature suggests hypertension is not a direct cause of sleep apnea, but that a few articles report it as a risk factor, through fluid shifting at night. The examiner said aggravation could not be judged without speculation because no sleep study was done before the hypertension began. The Board found those aggravation opinions inadequate, noting that aggravation can occur at any point, including recently, and resolved reasonable doubt in the veteran's favor.

Two cautions. The grant rested on VA's failed opinions and the benefit of the doubt, not on strong medical evidence for this direction. And a VA opinion that answers both questions with reasons would be much harder to outweigh. Board decisions are not precedential, but they show what the Board accepts.

If your sleep apnea came first

If your sleep apnea is already service connected, or can be, for example secondary to PTSD, claiming hypertension secondary to sleep apnea matches the research far better. The hypertension VA rating page covers that path.

VA rating for sleep apnea secondary to hypertension

Sleep apnea secondary to hypertension is rated the same way as any sleep apnea. Diagnostic Code 6847 in 38 CFR § 4.97, "Sleep Apnea Syndromes (Obstructive, Central, Mixed)," reads as follows.

Chronic respiratory failure with carbon dioxide retention or cor pulmonale, or; requires tracheostomy: 100

Requires use of breathing assistance device such as continuous airway pressure (CPAP) machine: 50

Persistent day-time hypersomnolence: 30

Asymptomatic but with documented sleep disorder breathing: 0

That is the current schedule. VA proposed new criteria in 2022 (87 FR 8474), but the proposal is not final; the sleep apnea VA rating page covers it.

VA rates the sleep apnea separately from the hypertension, which is rated under Diagnostic Code 7101. Its 10 percent level includes a minimum for a history of diastolic pressure predominantly 100 or more that requires continuous medication. The ratings combine under 38 CFR § 4.25, larger rating first. A 50 percent sleep apnea rating and a 10 percent hypertension rating combine to 55, which VA rounds up to 60 percent. A 30 percent sleep apnea rating and a 10 percent hypertension rating combine to 37, which rounds to 40 percent.

The C&P exam for sleep apnea secondary to hypertension

VA usually orders an exam or a medical opinion. The examiner is asked whether your sleep apnea is at least as likely as not caused by your hypertension and, separately, whether the hypertension aggravated it. An opinion that answers only the first question is inadequate under El-Amin v. Shinseki (2013).

The examiner looks at these things.

• Which came first: the date of your hypertension diagnosis against the date of your sleep study
• Your blood pressure history and every blood pressure medicine, especially whether your hypertension resists treatment
• Signs of fluid retention, such as leg swelling, and any aldosterone testing
• Other risk factors, such as weight, age, neck size, alcohol and smoking

Expect an unfavorable opinion to say that sleep apnea causes hypertension, not the reverse. That is a fair summary of most research, so your opinion has to explain why your records fit the narrower aggravation findings. An opinion that refuses to address aggravation because no sleep study predates the hypertension is a different problem; the Board found that reasoning inadequate in the case above. C&P exam prep can help you prepare, and the Board section below shows how the Board ruled on these appeals.

Why sleep apnea secondary to hypertension claims get denied

These are the usual gaps.

• The sleep apnea was diagnosed first, and no one addresses aggravation.
• The opinion cites the general link between the two conditions without saying which way it runs in your case.
• Nothing in the file shows resistant hypertension, fluid retention or worsening apnea.
• No baseline is described.
• Weight and other risk factors go unaddressed.

Nexus letter for sleep apnea secondary to hypertension

For this direction, a nexus letter has to give VA what the research alone does not. A strong one does seven things.

1. States that the doctor reviewed your records, including every sleep study, your blood pressure history and your medication list.
2. Sets out the timeline: when the hypertension began, when the apnea was diagnosed, and how each changed.
3. Acknowledges that most research shows sleep apnea raising blood pressure, and explains why your case is different.
4. Names the mechanism in your records, such as drug-resistant hypertension, fluid retention or high aldosterone, and cites the studies that support it.
5. Gives an opinion on causation, if the facts support one.
6. Gives a separate opinion on aggravation: your sleep apnea is aggravated by your service-connected hypertension, meaning it would be less severe but for the hypertension, and describes the baseline from earlier sleep studies or CPAP records.
7. Deals with weight, age and your other risk factors directly.

A doctor may conclude the link is not supportable for you, and that answer is worth having before you file. Raven Nexus shows what your records already contain and what is missing.

Other conditions claimed on top of service-connected hypertension, such as kidney disease, are on the hypertension secondary conditions page.

Questions veterans ask about sleep apnea secondary to hypertension

Can high blood pressure cause sleep apnea?

Not in the general population, as far as the research shows. Small studies suggest fluid retention in drug-resistant hypertension can make sleep apnea worse, which supports aggravation more than cause.

Is sleep apnea secondary to hypertension a strong VA claim?

Usually not on its own. It is stronger when your records show resistant hypertension, fluid retention or apnea that worsened as blood pressure control worsened, and when a doctor explains that path with a baseline.

Can blood pressure medicine make sleep apnea worse?

The research mostly shows the opposite: blood pressure medicines, diuretics in particular, modestly lowered apnea severity. Beta-blockers added a median of 1.2 kilograms in trials lasting six months or more (Sharma and colleagues, Hypertension, 2001), so a weight theory would need a large documented gain and would have to meet VA's middle-step test in VAOPGCPREC 1-2017.

Should I claim hypertension secondary to sleep apnea instead?

If your sleep apnea is service connected, yes, that direction matches the research far better. If neither condition is service connected, look first at what can be connected directly or secondary to another condition.

What is the VA rating for sleep apnea secondary to hypertension?

The same as any sleep apnea under Diagnostic Code 6847: 0, 30, 50 or 100 percent, with 50 percent when you require a CPAP. It combines with your hypertension rating.

Sources

• 38 CFR § 3.310, secondary service connection; M21-1 V.ii.2.D, aggravation of a nonservice-connected disability by a service-connected one (natural progress no longer applied).
• 38 CFR § 4.97, Diagnostic Code 6847, sleep apnea syndromes; 38 CFR § 4.104, Diagnostic Code 7101, hypertensive vascular disease, and Note 1; 38 CFR § 4.25, combined ratings table.
• Schedule for Rating Disabilities-Ear, Nose, Throat, and Audiology Disabilities; Special Provisions Regarding Evaluation of Respiratory Conditions; Schedule for Rating Disabilities-Respiratory System, proposed rule, 87 FR 8474 (February 15, 2022), not final.
• VA General Counsel Precedent Opinion 1-2017 (VAOPGCPREC 1-2017), obesity as an intermediate step.
• El-Amin v. Shinseki, 26 Vet. App. 136 (2013), an opinion must address aggravation.
• Board of Veterans' Appeals citation 25003137 (March 5, 2025, granted). Board decisions are not precedential.
• Peppard PE, Young T, Palta M, Skatrud J. Prospective study of the association between sleep-disordered breathing and hypertension. New England Journal of Medicine. 2000;342(19):1378-1384. PMID 10805822.
• Khurshid K, Yabes J, Weiss PM, et al. Effect of Antihypertensive Medications on the Severity of Obstructive Sleep Apnea: A Systematic Review and Meta-Analysis. Journal of Clinical Sleep Medicine. 2016;12(8):1143-1151. PMID 27397663.
• Friedman O, Bradley TD, Chan CT, Parkes R, Logan AG. Relationship between overnight rostral fluid shift and obstructive sleep apnea in drug-resistant hypertension. Hypertension. 2010;56(6):1077-1082. PMID 21060007.
• Gaddam K, Pimenta E, Thomas SJ, et al. Spironolactone reduces severity of obstructive sleep apnoea in patients with resistant hypertension: a preliminary report. Journal of Human Hypertension. 2010;24(8):532-537. PMID 20016520.
• Yang L, Zhang H, Cai M, et al. Effect of spironolactone on patients with resistant hypertension and obstructive sleep apnea. Clinical and Experimental Hypertension. 2016;38(5):464-468. PMID 27367159.
• Sharma AM, Pischon T, Hardt S, Kunz I, Luft FC. Hypothesis: Beta-adrenergic receptor blockers and weight gain: A systematic analysis. Hypertension. 2001;37(2):250-254. PMID 11230280.
• Board figures on this page: Claim Raven's read of every Board decision from 2021 to 2026 that it holds, and of every decision since 1992 for the longer view.