"Not Proximately Due To or the Result of a Service-Connected Disability"
Two separate theories
Causation asks whether the service-connected disability produced the new condition. asks whether it made an otherwise non-service-connected condition permanently worse. They are independent theories, and a denial that addresses only causation has left the aggravation theory undecided.
For , 38 CFR § 3.310(b) requires establishing the baseline level of severity before the aggravation occurred, because compensation is paid for the increment above that baseline.
Common secondary chains
- Knee or ankle disability altering gait, leading to hip, back, or opposite-limb conditions.
- Chronic pain or a service-connected physical condition contributing to a depressive or anxiety disorder.
- Medication side effects — for example, gastrointestinal disease attributed to long-term NSAID use for a service-connected orthopedic condition.
- Diabetes contributing to peripheral neuropathy, retinopathy, or nephropathy.
- Sleep apnea aggravated by a service-connected condition or by weight gain resulting from one, where the medical evidence supports that chain.
What a usable opinion contains
- A clear statement of the primary service-connected disability and the claimed secondary condition.
- An explicit finding on causation using the at-least-as-likely-as-not standard.
- A separate, explicit finding on , including the baseline severity before aggravation.
- Medical reasoning that connects the mechanism to this 's documented history, not general statements about the conditions.
Frequently Asked Questions
References & sources
- 38 CFR § 3.303 — Principles relating to service connection — Code of Federal Regulations
- 38 CFR § 3.159 — VA's duty to assist — Code of Federal Regulations
- 38 CFR § 3.2500 — Review of decisions (AMA lanes) — Code of Federal Regulations
- Caluza v. Brown, 7 Vet. App. 498 (1995) — U.S. Court of Appeals for Veterans Claims · Sets out the three elements of service connection.
Useful Tools & Topics
Have questions about your specific case?
Tell us about your claim, rating increase, or VA decision for a free case evaluation — a decision letter is helpful but not required. If your matter fits our current scope, we'll invite you to schedule a consultation.
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.
Related guides
"Pre-existing condition not aggravated by service"
The presumption of soundness, the clear-and-unmistakable-evidence standard, and what aggravation means under 38 CFR § 3.306.
Secondary Aggravation After Spicer
How VA evaluates aggravation of a non-service-connected condition under 38 CFR § 3.310(b), what a baseline finding requires, and where decisions go wrong.
"No evidence of an in-service event or injury"
When service treatment records are silent — lay evidence under Buchanan, personnel records, and the combat presumption in 38 U.S.C. § 1154(b).
Migraines Secondary to TBI
How VA evaluates migraine headaches claimed as secondary to a service-connected traumatic brain injury under DC 8100.