VA Secondary Conditions Explained: The Claims Most Veterans Never File

Ask a hundred veterans what a "secondary condition" is and most will guess wrong — usually something like "a less important condition." The real answer is worth real money, which is exactly why the claims industry's best-kept non-secret deserves a plain-language explanation.

The definition

A secondary condition is a new problem caused — or made worse — by a condition you're already service-connected for, or by the treatment for it.

Read that twice, because three parts matter:

1. "Caused or made worse" — aggravation counts, not just direct causation.
2. "Or by the treatment for it" — medication side effects count.
3. It never has to have happened during service. It can appear twenty years later.

Under 38 CFR § 3.310, a secondary condition rates and pays exactly like any other service-connected condition.

Two real-world examples

The medication path. You take an SSRI for a service-connected mental health condition, and it causes GERD (acid reflux). The reflux never came up in the military — but it exists because of the medication, so it can be claimed secondary to the mental health condition.

The body-chain path. A back injury from a fall in service leaves you with years of chronic pain and muscle tension — and now migraines. The migraines can be claimed secondary to the back condition.

Why this is where the money hides

Most veterans file their obvious conditions and stop. But conditions cause conditions: a knee alters your gait and wrecks the opposite hip; chronic pain disrupts sleep and mood; PTSD's hypervigilance drives hypertension, IBS, bruxism; medications ripple side effects through the whole body.

Because of how VA math combines ratings, a veteran stuck at 70% often can't get to 100% by increasing existing ratings — but two or three secondaries at 10–30% each can move the combined number substantially. The average veteran leaves real monthly compensation unclaimed simply because nobody ever showed them the connections.

What a secondary claim needs

The evidence structure is the same as any claim, with one twist: the nexus connects your new condition to your service-connected condition (not directly to service). You'll need:

• A current diagnosis of the secondary condition
• Your existing service-connected rating (the anchor)
• A medical nexus opinion: the secondary is "at least as likely as not" caused or aggravated by the service-connected condition
• The right claim language — file the connection, not just the condition name: "Sleep apnea, secondary to service-connected PTSD"

The honest caveats

Every secondary still needs that medical nexus — a doctor connecting it to the service-connected condition. Only claim what you actually experience; exaggerating claims is both wrong and counterproductive, since VA examiners are trained to spot it. And only the VA decides ratings — anyone promising you a specific outcome is selling something.

But if you're service-connected for anything and living with problems you never thought to connect — start asking the question. It may belong on your claim.

Sources: 38 CFR § 3.310 (secondary service connection), VA.gov — eligibility for disability benefits.