What are the three pillars of evidence for a VA disability claim?

Generally: (1) medical evidence of a current diagnosis and severity, (2) evidence of an in-service event, injury, or illness (or aggravation), and (3) a nexus or logical connection linking the current condition to service. Lay statements and functional-impact evidence often strengthen the file.

Does every VA claim require a nexus letter?

No. When service connection is clear from service records and continuity, a separate nexus letter may be less critical. For delayed claims, secondary connections, or unclear medical links, a strong medical opinion is often decisive.

Can lay statements replace medical evidence?

Lay statements cannot replace a medical diagnosis, but they can corroborate symptoms, onset, flare-ups, and functional impact—especially when medical records are incomplete.

Should I submit all my medical records or only what is relevant?

Submit complete, organized evidence that supports each element of your claim. Long unorganized dumps can slow adjudication; a clear index or summary helps VA understand what matters.

VA Claims Resource Guide

What Evidence Do You Need for a VA Claim?

Learn exactly what documentation the VA requires to approve your disability claim and how to build a stronger, evidence-based file.

When a veteran files a VA disability claim, the VA looks for three specific elements. If any are missing or weak, the claim will likely be denied. This applies whether you are filing for PTSD, back pain, or sleep apnea.

The Three Pillars of a VA Claim

A current diagnosed condition
An in-service event, injury, or illness
A nexus connecting the condition to service

The Four Types of Evidence You Need

1. Medical Evidence

This forms the backbone of your claim. The VA requires clear proof that your condition exists and is severe enough to warrant a rating.

✔ Current medical diagnosis from a qualified professional
✔ Treatment records and clinical notes
✔ Diagnostic tests (MRIs, X-rays, sleep studies, blood work)
✔ DBQs (Disability Benefits Questionnaires) completed by doctors
✔ Records showing prescription medications and their side effects

2. Service Records & In-Service Evidence

You must prove that something happened during your military service that caused or aggravated your condition.

✔ Service Treatment Records (STRs)
✔ Personnel records showing deployments, MOS, or hazard exposure
✔ Line of Duty (LOD) determinations
✔ Incident or accident reports
✔ Combat awards (Purple Heart, CAB)

3. The Medical Nexus

The critical link connecting your current diagnosis to the in-service event. Without a nexus, claims are almost always denied.

✔ Independent Medical Opinions (IMO)
✔ Nexus letters from specialists
✔ C&P exam opinions
✔ Medical literature supporting secondary claims

4. Lay Evidence & Buddy Statements

Statements from people who have witnessed your condition. Lay evidence fills in the gaps that medical records often miss.

✔ VA Form 21-4138
✔ Statements from spouses
✔ Buddy statements from fellow service members
✔ Employer statements about work impact

Why Claims with "Good" Evidence Still Get Denied

Many veterans submit large volumes of records but still get denied. The issue is usually lack of focus.

Without a clear nexus, even strong diagnoses may fail. Without clear severity documentation, you may receive a 0% rating.

See our denial guide to avoid common mistakes.

Disclaimer: Valor Evidence Group LLC is a consulting firm, not a law firm.

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