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    "Pre-Existing Condition Not Aggravated by Service"

    Last updated: 2026-08-19
    General education only. This page describes how VA generally evaluates these claims under federal regulations. It is not legal advice and is not a recommendation about any individual claim. Every veteran's facts and evidence are different — for guidance on a specific situation, speak with a VA-accredited representative.

    The presumption of soundness

    If a condition was not noted on the entrance examination, VA must rebut soundness with clear and unmistakable evidence on both prongs. Wagner v. Principi, 370 F.3d 1089 (Fed. Cir. 2004); VAOPGCPREC 3-2003. A history the reported at enlistment is not, by itself, a notation of a defect.

    'Clear and unmistakable' is a far higher standard than the usual balance-of-evidence test. A single examiner's statement that a condition 'likely predated service' does not ordinarily satisfy it.

    When the condition was noted at entry

    Then the question is . Under 38 CFR § 3.306, an increase in disability during service is presumed to be aggravation unless there is a specific finding that the increase is due to the natural progress of the disease. Temporary flare-ups without a worsening of the underlying condition do not establish aggravation. Hunt v. Derwinski, 1 Vet. App. 292 (1991).

    Evidence that speaks to aggravation

    • The entrance examination itself — what was and was not noted decides which standard applies.
    • In- showing a change in frequency, severity, or treatment intensity.
    • A profile change, duty limitation, or separation examination documenting a worse baseline than at entry.
    • A medical opinion that distinguishes natural progression from service-related worsening and explains why.

    Frequently Asked Questions

    References & sources

    1. 38 CFR § 3.303 — Principles relating to service connectionCode of Federal Regulations
    2. 38 CFR § 3.159 — VA's duty to assistCode of Federal Regulations
    3. 38 CFR § 3.2500 — Review of decisions (AMA lanes)Code of Federal Regulations
    4. Caluza v. Brown, 7 Vet. App. 498 (1995)U.S. Court of Appeals for Veterans Claims · Sets out the three elements of service connection.

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    Have questions about your specific case?

    Every veteran's facts are different. A free initial consultation with a VA-Accredited Claims Agent can tell you whether your matter is a fit for representation — and what the right next step looks like either way.

    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.

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