Evidence is the record VA uses to answer three recurring questions: Do you have a current disability or qualifying symptoms? Did something happen in service (or is a legal presumption available)? Is there a link between the two? The exact proof changes by claim. A presumptive claim may not require a separate medical nexus opinion, and an increased-rating claim focuses on present severity rather than proving the original event again. Do not treat a checklist as a substitute for the rule that applies to your issue.

The evidence checklist

  1. Current disability or impairment. A diagnosis, treatment record, examination, or competent evidence of symptoms and functional impairment can show what exists now. Include the condition name, relevant tests, medications, treatment history, and how it limits work and ordinary activities. A symptom diary can organize examples; the Symptom Tracker is useful for dates and frequency but is not a medical record.
  2. In-service event, disease, injury, or exposure. Service treatment records (STRs), personnel records, orders, performance reports, deployment records, combat or hazard documentation, and credible lay observations can establish what occurred. For Guard or Reserve service, identify the qualifying duty period. See Chapter 25: TERA and Toxic Exposure and Chapter 11: Secondary and Presumptive Conditions when an exposure or presumption may change the proof.
  3. Connection (nexus). A medical opinion or the facts and regulation supporting a presumption can connect the current disability to service. A secondary claim needs evidence connecting the new condition to an already service-connected disability, including aggravation when that is the theory. Chapter 3: What Makes a Strong Nexus Letter explains what a provider should address.

Records and witnesses

Ask VA to obtain relevant federal records and identify the facility, dates, and condition clearly. VA treatment records, service records, and other federal records are part of VA's duty to assist when the claim provides enough information to locate them. For private records, provide the provider's name, address, dates, and authorization when requested; VA cannot promise to obtain a private record that a provider will not release. You may submit copies yourself. Keep a receipt for every upload and use C-File ordering later to compare your copy with the claims file.

Useful evidence often includes:

  • STRs and post-service medical records, including urgent-care, hospital, and specialist notes;
  • DD-214, personnel records, duty or deployment orders, awards, job duties, and exposure documentation;
  • imaging, laboratory results, medication history, and treatment response;
  • a VA examination or a private Disability Benefits Questionnaire (DBQ) when appropriate. A DBQ organizes findings; it does not guarantee a rating;
  • a veteran statement and buddy or lay statements describing firsthand events, symptoms, timing, and functional effects;
  • an evidence index that labels each document and explains which element it supports. The evidence checklist and Raven Scan can help organize a packet, but verify every extracted fact against the original record.

Competency, credibility, and weight

Lay witnesses are generally competent to report what they personally saw, heard, or experienced: an injury, a visible rash, missed sleep, a change in behavior, or difficulty climbing stairs. They are usually not competent to diagnose a complex disease or give a medical-causation opinion merely because they observed symptoms. A clinician's opinion must be based on appropriate knowledge, training, or experience and a reasoned review of the facts. VA weighs all evidence, including favorable and unfavorable evidence; it does not apply a simple rule that a VA opinion always beats a private opinion or that a specialist always wins.

Credibility is separate from competency. Specific dates, consistent descriptions, ordinary details, and an honest acknowledgment of what a witness does not remember can help. Contradictions, copied language, unexplained gaps, or statements outside a witness's personal knowledge can reduce weight. Never change a record or ask a witness to repeat a conclusion they did not observe.

Duty to assist and favorable findings

VA has a duty to assist with relevant records and an examination or opinion when the statutory threshold is met, but the claimant still must identify the issue, cooperate with requests, attend examinations, and submit or authorize private evidence. If VA says evidence is missing, respond by the deadline and explain what was already submitted. Read every decision for favorable findings—for example, that a current diagnosis or an in-service event is established. Under the applicable review rules, a favorable finding is generally binding in later adjudication of that issue unless the law's clear-error exception applies. Preserve the exact wording when deciding whether an appeal or supplemental claim is needed; Chapter 8: How to Read Your Decision Letter and Chapter 16: Appeals and Review Options cover the next step.

Evidence should be complete, accurate, and tied to the element it proves. More pages are not automatically better. A short, well-labeled record that answers the legal questions is usually more useful than a large upload with no explanation.

Official sources