A secondary condition VA claim is one of the most powerful — and most underused — strategies in the entire disability system. It lets you claim a new health problem that was caused or worsened by a condition you’re already service-connected for. Many veterans don’t realize that the conditions stacking up over the years because of their original injury can each be compensated. This guide explains how secondary service connection works and how to prove it.
Quick disclaimer: This is general educational information, not legal advice. Talk to an accredited Veterans Service Officer (VSO) or attorney about your specific case.
What a Secondary Condition VA Claim Is
Under 38 CFR 3.310, the VA can grant service connection for a disability that is “proximately due to, or the result of” a condition that’s already service-connected. In plain English: if condition A is service-connected, and condition A (or its treatment) causes or worsens condition B, then condition B can also be service-connected — as a secondary condition.
There are two flavors of this under the regulation:
- Secondary causation: Your service-connected condition directly caused a new condition. Example: limited mobility from a service-connected knee injury leads to weight gain, which contributes to sleep apnea.
- Aggravation: You had a condition already, and your service-connected disability made it permanently worse. The VA establishes a “baseline” severity, then rates only the additional disability caused by the aggravation.
The Three Things You Must Prove
To win a secondary claim, you need three elements:
- A current diagnosis of the secondary condition. You can’t claim something you might develop later — only a condition you actually have now.
- An existing service-connected primary condition. Importantly, this primary can be rated at any level — even 0%. What matters is that the VA has recognized it as service-connected, not how high it’s rated.
- A medical nexus linking the two — evidence that the primary condition (or its treatment) caused or aggravated the secondary one.
That third element — the nexus — is where most secondary claims are won or lost.
A Common Example: GERD Secondary to Medication
One of the most common secondary claims involves GERD (acid reflux) caused by medication. If you take NSAIDs for a service-connected musculoskeletal condition, or certain medications for service-connected PTSD, those drugs can irritate the stomach and contribute to GERD. Because the medication treats a service-connected condition, the resulting GERD can be claimed as secondary — even though the medication itself was prescribed correctly.
One 2026 update worth knowing: GERD now has its own rating under Diagnostic Code 7206, and the VA generally looks for objective evidence — such as an esophageal stricture documented on an endoscopy — for a compensable rating. So documentation matters more than ever. Pharmacy records showing how long you’ve taken the medication, and dated provider notes showing when your symptoms began, are exactly the kind of evidence that builds a nexus.
How to Strengthen a Secondary Claim
- Document the timeline. Make sure your records clearly show the secondary condition developing after the primary one (or its treatment).
- Get a nexus opinion. A medical professional’s written opinion connecting the two conditions is often decisive for secondary claims.
- File multiple secondaries together. There’s no limit on how many secondary conditions you can claim, and filing them together on one application creates a single effective date for all of them.
- Use lay evidence to fill gaps. A buddy statement describing your symptoms over time can support the picture your records paint.
Remember that each secondary condition gets its own rating based on its severity, and those ratings combine with your existing ones using VA math — so several secondaries can meaningfully raise your overall rating.
The Bottom Line
If you have a service-connected condition, look at everything downstream of it — the new problems it caused and the older ones it made worse. A secondary condition VA claim turns those into compensable disabilities, as long as you can show a current diagnosis, the service-connected primary, and a medical nexus tying them together. For the full picture of how claims work start to finish, see our plain-English walkthrough of how VA disability claims work. You can read the official regulation overview on VA.gov’s eligibility page.