Many veterans put all their energy into their main service-connected injury and never realize that condition may be quietly causing other problems — problems the VA will also compensate. These are called secondary conditions, and they are one of the most overlooked parts of a disability claim. This guide explains what secondary conditions are, common examples, and how to actually prove the connection.
What Is a Secondary Condition?
A secondary condition is a disability that was caused — or made worse — by a condition that is already service-connected. The original injury is the "primary" condition; anything that develops as a result of it can be claimed as "secondary."
Here is the key point: a secondary condition does not have to trace directly back to your time in service on its own. It only has to be linked to a disability the VA has already recognized as service-connected. That makes secondary claims a powerful way to raise your overall rating.
Common Examples of Secondary Conditions
Secondary conditions tend to show up in patterns the VA sees often. A few common examples:
- Sleep apnea secondary to PTSD, or to weight gain from a service-connected condition.
- Depression or anxiety secondary to chronic pain or a disabling physical injury.
- Knee, hip, or back problems secondary to an altered gait — for example, favoring one leg because of a service-connected ankle or knee injury, which wears down the other joints over time.
- Radiculopathy (nerve pain) secondary to a service-connected back condition.
- Migraines secondary to a head injury or to medication for another service-connected condition.
If you have a service-connected disability and a newer problem that seems to have grown out of it, there may be a secondary claim worth exploring.
Why Secondary Claims Get Denied
Secondary claims get denied for the same reason many claims do: the file does not clearly connect the two conditions. You might have a documented primary disability and a clear new diagnosis, but if nothing in the record explains how one led to the other, the VA has no basis to grant it.
That missing explanation — the medical link between the primary and the secondary condition — is what sinks otherwise valid claims.
How a Nexus Letter Proves the Connection
This is exactly where a nexus letter does its work. (If the term is new to you, here is what a nexus letter is and how it functions.)
For a secondary claim, a strong nexus letter from a qualified provider:
- States that your secondary condition is at least as likely as not caused or aggravated by your service-connected primary condition.
- Explains the medical reasoning behind that connection, not just the conclusion.
- Shows the provider actually reviewed your records rather than signing a template.
The word "aggravated" matters here. Even if your service-connected condition did not cause the secondary problem outright, a claim can be granted if it made an existing condition meaningfully worse.
What You Need to File a Secondary Claim
In general, a secondary claim rests on three pieces:
- A current diagnosis of the secondary condition.
- An already service-connected primary condition.
- A medical link between the two.
You can read more about how the VA handles disability claims on its official site. The first two pieces come from your records; the third is usually where a nexus letter makes the difference.
The Bottom Line
If you have a service-connected disability and have developed another condition that seems related, you may be leaving a rating on the table by not filing a secondary claim. The hurdle is almost always proving the connection — and that is a solvable problem.
If you would like help establishing that link, you can see how our process works or reach out to talk through your situation.
