The Three Things Every VA Disability Claim Must Prove

Every VA disability claim—no matter the condition—comes down to three legal requirements. If even one of these elements is missing, the VA will deny the claim.

Understanding these three requirements allows you to build your claim correctly from the beginning or fix the exact weakness during an appeal.

To grant service connection, the VA must find evidence of:

1. A Current Diagnosed Disability
2. An In-Service Event, Injury, or Illness
3. A Medical Nexus Connecting the Two

If your claim was denied, it is almost always because the VA believed one of these three elements was not adequately supported.

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1. A Current Diagnosed Disability

The first requirement is proof that you have a current disability.

This usually means:

• A formal medical diagnosis
• Documented symptoms consistent with a diagnosable condition
• Ongoing treatment records

The VA cannot grant compensation for symptoms alone if no diagnosis exists (with limited exceptions such as certain chronic pain conditions under evolving case law).

Common issues veterans encounter with this element:

• The diagnosis appears in private records but was not submitted
• The C&P examiner states there is “no diagnosis”
• The condition resolved temporarily and the VA claims it is not current

If the VA denies a claim stating “no current disability,” your appeal must focus on proving that a diagnosis exists or that symptoms meet diagnostic criteria.

Key takeaway:
Without a current disability, the VA will not move forward to analyze the rest of the claim.

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2. An In-Service Event, Injury, or Illness

The second requirement is proof that something happened during service that could have caused or aggravated the condition.

This does not always require a documented injury in your service treatment records. It can include:

• Documented complaints during service
• Line of duty reports
• Deployment exposures
• Combat events
• Physical training injuries
• Military occupational hazards
• Credible lay evidence describing events

The VA must find evidence that an event occurred in service. However, the standard is not “perfect documentation.” In many cases, credible statements combined with service records showing duty locations or occupational specialty can establish this element.

Common reasons this element fails:

• No documentation in service records
• The VA concludes the event did not occur
• The claimed condition began years later with no explanation

If your denial states the condition was “not shown in service,” your appeal must strengthen the evidence of what occurred during your time in uniform.

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3. A Medical Nexus

The third requirement is often the most difficult and the most common reason for denial.

A nexus is a medical link between your current disability and your in-service event.

In simple terms, a medical professional must state that it is:

• “At least as likely as not” (50% probability or greater)
  that your condition was caused by or related to service.

Without this link, the VA will deny the claim—even if you have a diagnosis and a documented in-service injury.

Most denials occur here because:

• The C&P examiner provides a negative opinion
• The examiner uses speculative language
• The opinion lacks sufficient rationale
• There is no medical opinion at all

The VA is not allowed to make its own medical conclusions. It relies heavily on medical opinions. If the only opinion in your file is negative, the rater will usually deny the claim.

Strengthening the nexus may involve:

• Challenging errors in a C&P exam
• Submitting a private medical opinion
• Providing medical literature
• Clarifying continuous symptoms since service

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How These Three Elements Work Together

Think of your claim as a three-legged stool. If one leg is missing, the entire claim collapses.

Example:

• You have a diagnosis of migraines.
• You were exposed to blast events in service.
• The C&P examiner says your migraines are “less likely than not” related to service.

Even though the first two elements are satisfied, the negative nexus causes denial.

Another example:

• You currently have back pain.
• There is no diagnosis in your records.
• You injured your back during training.

Without a formal diagnosis, the VA may deny the claim at the first element.

Each element must be independently supported by evidence.

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Favorable Findings Matter

If your decision letter lists favorable findings—such as confirming a diagnosis or confirming an in-service event—you do not need to re-prove those elements on appeal.

Instead, you can focus entirely on strengthening the missing element.

Understanding which of the three requirements failed allows you to choose the correct appeal strategy, whether that means requesting a Higher-Level Review, filing a Supplemental Claim with new evidence, or appealing to the Board.

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Final Thoughts

Every VA disability claim is built on the same legal foundation:

• Current disability
• In-service event
• Medical nexus

When you break a denial down into these three parts, the decision becomes much easier to understand. Instead of feeling overwhelmed by legal language, you can identify exactly what evidence needs to be added or corrected.

Once you know which element is weak, you can build your appeal strategically—and increase your chances of success.