If your decision letter said the evidence did not establish a relationship between your condition and service, you ran into a nexus problem. The word "nexus" often does not appear anywhere in the letter, which is part of why the denial feels confusing. A nexus is simply the medical link between a current diagnosed condition and an in-service event, injury, illness, or exposure - or, in a secondary claim, between a new condition and a disability the VA already service connected. What is a VA nexus letter explains the document itself; this guide explains the denial language.
The three elements behind the language
Under 38 CFR 3.303, direct service connection generally requires a current disability, an in-service event or injury, and a link between the two. Secondary service connection under 38 CFR 3.310 requires a new condition and a link to an already service-connected disability. A denial almost always names which of those the rater found missing.
- A current diagnosed disability
- An in-service event, injury, illness, or exposure - or an existing service-connected condition
- Medical evidence connecting the two
Phrases that signal a nexus denial
- "The evidence does not show that your condition was incurred in or caused by military service."
- "A link between your medical condition and military service has not been established."
- "The claimed condition is less likely than not related to service."
- "There is no evidence showing that your condition is secondary to your service-connected disability."
Where veterans start
Every case is different, and there is no obligation at any step. When veterans want to understand what their records actually support, these are the two most common starting points:
- Medical records review
A licensed physician reviews your records for a $250 flat fee and identifies which conditions the available evidence may support. The fee is refunded in full if nothing supportable is identified.
- Nexus letter
When the records support one, a licensed provider writes the medical opinion that addresses the link between your condition and your service or an already service-connected disability.
What it does not mean
A nexus denial is not a finding that you are not ill, and it is not usually a finding that the in-service event never happened. It generally means the file did not contain a medical explanation of the relationship, or that the only opinion of record - often a Compensation and Pension examiner's - was negative. Why VA claims get denied covers the other common reasons, and reading your VA decision letter walks through the reasons-and-bases section line by line.
Where the standard of proof matters
The VA decides in the veteran's favor when the positive and negative evidence is in approximate balance. That is the reasonable-doubt rule in 38 CFR 3.102, and it is why medical opinions are written in "at least as likely as not" language rather than absolute terms. A reasoned opinion from a qualified clinician can move a file from silence on the question to evidence on the question.
What veterans usually do next
Start by identifying exactly which element the letter says is missing, then look at whether your records actually contain evidence on that point. Free accredited help is available from a VSO. If you are unsure whether your records support a medical opinion at all, a medical records review tells you before you spend anything further, and our team can discuss options by phone at no cost. We do not provide legal advice or file appeals.