Persian Gulf War Presumption

38 CFR §3.317 provides presumptive service connection for three categories of disability in Persian Gulf War veterans: undiagnosed illness, medically unexplained chronic multisymptom illness (MUCMI), and nine specific infectious diseases. This page reproduces the regulation with plain-English context.

Time-sensitive: Under 38 CFR 3.317, a qualifying undiagnosed illness or MUCMI must manifest to 10 percent or more no later than December 31, 2026. The VA has extended this window before but has not extended it again as of June 2026. Verify the current sunset at the eCFR link in the Source section below.
New: step-by-step Gulf War illness claim guide - how to file under 3.317, how the C&P exam decides it, and the common traps.

How §3.317 works

Section 3.317 covers two distinct presumptions:

  • (a) Undiagnosed illness and medically unexplained chronic multisymptom illness (MUCMI). For Persian Gulf veterans who exhibit objective indications of a qualifying chronic disability that cannot be attributed to any known clinical diagnosis.
  • (c) Nine infectious diseases. For veterans with a qualifying period of service who develop one of nine named infectious diseases within specified manifestation periods.
Service connection effect (§3.317(a)(6)): A qualifying chronic disability referred to in this section shall be considered service connected for purposes of all laws of the United States.

Qualifying service

Persian Gulf veteran

A veteran who served on active military, naval, or air service in the Southwest Asia theater of operations during the Persian Gulf War.

Southwest Asia theater of operations (§3.317(e)(2))

  • Iraq
  • Kuwait
  • Saudi Arabia
  • The neutral zone between Iraq and Saudi Arabia
  • Bahrain
  • Qatar
  • The United Arab Emirates
  • Oman
  • The Gulf of Aden
  • The Gulf of Oman
  • The Persian Gulf
  • The Arabian Sea
  • The Red Sea
  • The airspace above these locations

Afghanistan (infectious disease presumption only)

For the nine-infectious-disease presumption in paragraph (c), "qualifying period of service" also includes active military, naval, or air service on or after September 19, 2001, in Afghanistan.

Undiagnosed illness and MUCMI (§3.317(a))

The rule

VA will pay compensation to a Persian Gulf veteran who exhibits objective indications of a qualifying chronic disability, provided the disability became manifest either during active service in the Southwest Asia theater of operations or to a degree of 10 percent or more not later than December 31, 2026, and by history, physical examination, and laboratory tests cannot be attributed to any known clinical diagnosis.

What counts as a "qualifying chronic disability"

(A) Undiagnosed illness.

(B) Medically unexplained chronic multisymptom illness (MUCMI) defined by a cluster of signs or symptoms, such as:

  • Chronic fatigue syndrome
  • Fibromyalgia
  • Functional gastrointestinal disorders (excluding structural gastrointestinal diseases)

MUCMI definition (§3.317(a)(2)(ii))

A diagnosed illness without conclusive pathophysiology or etiology, that is characterized by overlapping symptoms and signs and has features such as fatigue, pain, disability out of proportion to physical findings, and inconsistent demonstration of laboratory abnormalities. Chronic multisymptom illnesses of partially understood etiology and pathophysiology, such as diabetes and multiple sclerosis, will not be considered medically unexplained.

Chronicity rule (§3.317(a)(4))

Disabilities that have existed for 6 months or more and disabilities that exhibit intermittent episodes of improvement and worsening over a 6-month period will be considered chronic. The 6-month period of chronicity is measured from the earliest date on which the pertinent evidence establishes that the signs or symptoms first became manifest.

How these are rated (§3.317(a)(5))

A qualifying chronic disability shall be rated using evaluation criteria from part 4 of this chapter for a disease or injury in which the functions affected, anatomical localization, or symptomatology are similar.

Signs or symptoms that may qualify (§3.317(b))

For purposes of the undiagnosed-illness / MUCMI presumption, signs or symptoms that may be manifestations include, but are not limited to:

  • Fatigue
  • Signs or symptoms involving skin
  • Headache
  • Muscle pain
  • Joint pain
  • Neurological signs or symptoms
  • Neuropsychological signs or symptoms
  • Signs or symptoms involving the respiratory system (upper or lower)
  • Sleep disturbances
  • Gastrointestinal signs or symptoms
  • Cardiovascular signs or symptoms
  • Abnormal weight loss
  • Menstrual disorders
"Objective indications of chronic disability" include both "signs," in the medical sense of objective evidence perceptible to an examining physician, and other, non-medical indicators that are capable of independent verification.

Nine infectious diseases (§3.317(c))

For veterans with a qualifying period of service (Southwest Asia theater, or active service on or after September 19, 2001, in Afghanistan), the following diseases are presumptively service-connected when they meet the manifestation-period requirements:

  • Brucellosis
  • Campylobacter jejuni
  • Coxiella burnetii (Q fever)
  • Malaria
  • Mycobacterium tuberculosis
  • Nontyphoid Salmonella
  • Shigella
  • Visceral leishmaniasis
  • West Nile virus
Manifestation period (§3.317(c)(3)(i)): With three exceptions, the disease must have become manifest to a degree of 10 percent or more within 1 year from separation from a qualifying period of service. Malaria must have become manifest to a degree of 10 percent or more within 1 year from separation or at a time when standard or accepted treatises indicate that the incubation period commenced during a qualifying period of service. There is no time limit for visceral leishmaniasis or tuberculosis.

Long-term health effects. Paragraph (d) identifies long-term health effects potentially associated with each of the nine infectious diseases, per a report of the Institute of Medicine of the National Academy of Sciences. Examples include Guillain-Barré syndrome following Campylobacter jejuni (if manifest within 2 months), reactive arthritis following Shigella (within 3 months), and chronic hepatitis, endocarditis, or post-Q-fever chronic fatigue syndrome following Coxiella burnetii. The full Table to §3.317 lists all column-A disease and column-B condition pairs, see the linked eCFR regulation for the complete table.

Exclusions (§3.317(a)(7) & (c)(4))

Compensation will not be paid under §3.317 for a chronic disability if any of the following apply:

  • Affirmative evidence that the disability was not incurred during active service in the Southwest Asia theater of operations (or, for infectious diseases, the qualifying period of service).
  • Affirmative evidence that the disability was caused by a supervening condition or event occurring between the veteran's most recent departure from the theater and the onset of the disability.
  • Affirmative evidence that the disability is the result of the veteran's own willful misconduct or the abuse of alcohol or drugs.

Source and currency

Authority: 38 U.S.C. 1117, 1118. Originally codified at 75 FR 59970 (Sept. 29, 2010), as amended through 86 FR 51001 (Sept. 14, 2021).

Regulation text: 38 CFR §3.317 on eCFR.gov (official text, always current).

Data on this page: Reproduced from the eCFR Title 38 snapshot dated 2026-04-20. The eCFR link above is authoritative if it differs.

Scope and limitations

Not the exclusive pathway. This page describes one specific presumption (§3.317). Other regulations, direct service connection, and presumptions for other toxic exposures may apply separately.

Not legal advice, not a claim filing. This page provides factual reference only. It is not legal advice, does not establish representation, and does not constitute the filing of any claim. For case-specific guidance, find an accredited VSO representative.

Data vintage. Regulatory text pulled from eCFR on 2026-04-22. The undiagnosed-illness / MUCMI presumption includes a sunset date (December 31, 2026) that Congress has extended multiple times, verify the current sunset against the eCFR link above.

Current diagnosis and evidence still required. The presumption relieves the burden of proving the link to service. It does not eliminate the need for objective indications of chronic disability and evidence of qualifying service.

Related reference pages

Presumptive Condition CheckerCheck if any presumption fits your service Toxic exposure BVA dataAppeal outcomes for toxic-exposure claims PACT Act overviewPost-9/11 burn-pit presumptives How the VA decides claimsThe three elements of service connection Gulf War Illness Claim GuideStep-by-step: how to file under 3.317, C&P exam logic, common traps Find an accredited VSO representativeFree help with claim-specific questions