Secondary Service Connection — Claiming Conditions Your Disability Caused

A secondary condition is one that was caused or made worse by a condition the VA already service-connected. Under 38 CFR § 3.310, that second condition is itself service-connected — you don't have to tie it back to service all over again. You tie it to the disability you already have.

This is where many veterans leave benefits unclaimed, because the link isn't obvious until someone points it out.

How secondary service connection works

You need three things:

1. 1.A current diagnosis of the secondary condition.
2. 2.An already service-connected "primary" condition.
3. 3.A medical nexus — a provider's opinion that the primary condition at least as likely as not caused or aggravated the secondary one.

Common secondary chains

• •Sleep apnea secondary to PTSD, or to weight gain from a service-connected condition.
• •Depression or anxiety secondary to chronic pain.
• •Radiculopathy (nerve pain in the legs/arms) secondary to a back or neck condition.
• •GERD secondary to medications taken for a service-connected condition.
• •Hypertension secondary to PTSD.

"Aggravation" counts too

You don't need the primary condition to have created the secondary one. If your service-connected disability made an existing condition worse, the worsening is service-connected. The VA rates the amount of aggravation.

Why it's worth checking

Each secondary condition is its own rating that combines into your overall percentage. A single strong secondary claim can move your combined rating — and the math is not intuitive, because the VA uses whole-person combined-rating math, not simple addition.