Secondary Conditions
Required Forms
VA Form 21-526EZ
Application for Disability Compensation and Related Compensation Benefits
What secondary service connection means
Under 38 CFR § 3.310, a disability that is proximately due to, the result of, or aggravated by a service-connected condition can itself be service-connected. This is called secondary .
There are two theories: causation (the primary condition caused the secondary) and (the primary condition made a non-service-connected condition worse than its natural progression). Aggravation cases are often won on a partial basis — the rating reflects only the additional disability beyond the baseline.
Common secondary pairings
- Knee or ankle injury → secondary hip, back, or contralateral knee from altered gait.
- PTSD or depression → secondary sleep apnea, hypertension, GERD, erectile dysfunction.
- Diabetes (often presumptive) → secondary peripheral neuropathy, retinopathy, nephropathy, hypertension.
- Tinnitus → secondary anxiety, depression, or sleep disturbance.
- Chronic pain conditions → secondary mental health conditions (depression, anxiety).
- Medication side effects from a service-connected condition → secondary GI, cardiac, or endocrine conditions.
Three elements of a secondary claim
- A current diagnosis of the secondary condition (within roughly the last 12 months ideally).
- An existing service-connected primary condition.
- A medical opinion linking the two — explaining the mechanism by which the primary condition caused or aggravated the secondary.
The nexus opinion
The opinion is the heart of most secondary claims. A strong opinion is written by a qualified medical professional, references the 's specific medical history and the relevant medical literature, and uses the standard VA language: '' caused by or aggravated by the service-connected condition.
C&P examiners are sometimes dismissive of secondary theories. An () from a private specialist can carry significant weight, especially for less-common pairings.
Where these claims break down
- ×Filing a secondary claim without any nexus evidence and hoping the C&P examiner provides one.
- ×Relying on a one-line nexus statement with no rationale — the VA needs the 'why.'
- ×Not addressing aggravation as an alternative theory if causation is weak.
- ×Forgetting that secondaries to presumptive conditions (Agent Orange, PACT Act, Gulf War) are also presumed service-connected.
- ×Failing to claim mental health secondaries to chronic physical conditions.
Frequently Asked Questions
Useful Tools & Topics
This kind of issue turns on lane, evidence, and timing
Matters like this often come down to lane selection, the right evidence at the right moment, and protecting your effective date. If your issue is already in dispute or post-decision, check whether your matter fits our review process.
Disclaimer: This page is for educational purposes only and does not constitute legal advice. Oakridge Claims is a private business and is not affiliated with, endorsed by, or operated by the U.S. Department of Veterans Affairs. No guarantees of outcomes are made. Each claim is decided on its individual facts.
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