If you're service-connected for PTSD and you've been diagnosed with obstructive sleep apnea, there's a good chance those two conditions are connected — and that you're owed more than you're currently receiving. Sleep apnea secondary to PTSD is one of the most common, and most winnable, secondary claims I help veterans with.

But "winnable" doesn't mean automatic. The VA won't connect the two on its own. You have to show the link with the right medical evidence. Here's exactly how that works.

First, what "secondary" actually means

A secondary condition is a disability that's caused or made worse by a condition the VA already considers service-connected. The key advantage: you don't have to trace your sleep apnea back to a specific event in service. You only have to tie it to your service-connected PTSD. PTSD becomes the bridge between your military service and your sleep apnea.

If this idea is new to you, I broke it down in my guide to VA secondary conditions.

Why PTSD and sleep apnea are linked

This isn't a loophole. There's real medicine behind it, and a growing body of peer-reviewed research supports the connection. PTSD disrupts sleep and the body in ways that can cause or worsen obstructive sleep apnea:

• Chronic hyperarousal and fragmented sleep. PTSD keeps the nervous system in a heightened state. Years of broken, shallow sleep, nightmares, and insomnia take a measurable toll on how you breathe at night.
• Medication side effects. Many of the medications used to treat PTSD — and the depression and anxiety that often ride along with it — cause weight gain and sedation. Both are well-known contributors to sleep apnea.
• Inactivity and weight gain. PTSD often leads to isolation, reduced activity, and weight gain, which is one of the single biggest risk factors for obstructive sleep apnea.

The point isn't that PTSD is the only possible cause of sleep apnea. It's that, for a specific veteran, PTSD is "at least as likely as not" a real contributor. That phrase matters — and I'll come back to it.

The three things your claim needs

To win sleep apnea as secondary to PTSD, your file has to show three things:

1. A current sleep apnea diagnosis. This means an actual sleep study (polysomnography) confirming obstructive sleep apnea — not just snoring or a suspicion. A CPAP prescription is strong supporting evidence.
2. Service-connected PTSD. You need an established, rated PTSD service connection. It's the anchor the entire claim hangs on.
3. A medical nexus opinion. This is the piece that ties #1 to #2 — a qualified provider's written opinion that your sleep apnea is at least as likely as not caused or aggravated by your PTSD, with the medical reasoning to back it up.

That third piece is where most claims live or die — and it's where a nexus letter comes in.

"Caused OR aggravated" — don't give up if your apnea came first

A lot of veterans assume they're out of luck if their sleep apnea was diagnosed before their PTSD, or if they have other risk factors like weight or family history. That's not true. The VA recognizes two separate paths:

• Causation — PTSD caused the sleep apnea.
• Aggravation — PTSD made pre-existing sleep apnea worse than it otherwise would have been.

Under the aggravation path, even if something else started your sleep apnea, the VA can still grant the portion of the disability your PTSD made worse. So other risk factors don't automatically sink your claim. A strong nexus opinion addresses them head-on instead of pretending they don't exist.

What separates a strong nexus letter from a weak one

The VA sees a lot of thin, copy-paste letters that simply declare "PTSD causes sleep apnea" and stop there. Those get very little weight. A letter that actually moves a claim does four things:

• States the opinion in the VA's own standard — "at least as likely as not."
• Explains your specific mechanism — your medications, your weight history, your documented sleep symptoms — not a generic template.
• Shows the provider actually reviewed your records: service records, PTSD history, sleep study, and medication list.
• Addresses aggravation, not just causation, so the claim has a second path to win on.

That's the standard I write to. A nexus letter isn't a form to fill out — it's a medical argument, and the details are what win.

Why these claims still get denied

Even strong claims get denied, and usually for fixable reasons: no sleep study in the file, a generic nexus opinion, a rushed or unfavorable C&P exam, or a letter that never addressed aggravation. If you've already been denied, that's usually not the end of the road — it's a sign that one specific piece was missing. I cover this in detail in why VA claims get denied (and how to fix it).

The rating — and why timing matters right now

Here's the part worth paying close attention to in 2026. Sleep apnea is currently rated at 0%, 30%, 50%, or 100%, and as the rules stand today, needing a CPAP machine carries an automatic 50% rating — roughly $1,100 or more per month, tax-free, for a single veteran, and often considerably higher once it's combined with your PTSD rating.

But the VA has proposed changing those rules. The proposed criteria would tie your rating to how well treatment controls your symptoms rather than to whether you use a CPAP — which could eliminate that automatic 50% for new claims. As of now, those changes are only proposed, not final, and veterans who already hold a rating are expected to be grandfathered in.

The takeaway is simple: the current rules are favorable, and if you have PTSD and sleep apnea that isn't service-connected yet, filing sooner rather than later protects you. You can read the VA's own overview of disability claims at va.gov.

Let's connect it the right way

Sleep apnea secondary to PTSD is one of the strongest secondary claims out there — but only when the medical link is made clearly and specifically. That's what I do. I'm a Marine Corps veteran, I review your actual records, and I write the kind of detailed, defensible nexus opinion the VA can't easily wave off.

If you have service-connected PTSD and a sleep apnea diagnosis (or a CPAP), let's talk. Start your nexus letter here, or reach out for a free consultation — I'm glad to tell you honestly whether I think I can help before you spend a dime.

2026 Update — New Causation Standard: The VA updated the secondary service connection framework in May 2026 following Spicer v. McDonough. Secondary nexus letters must now use "but for" causation language rather than "proximately due to" — see The VA Changed the Rules on Secondary Claims: What the New 'But For' Standard Means for Your Nexus Letter (2026) for what this means for your sleep apnea secondary claim.

Every claim is different, and nothing here is a guarantee of a specific outcome or a substitute for individualized advice. This is general information to help you understand the process.