Persian Gulf War Presumption

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

No filing deadline, and the regulation below is behind the statute. Section 405 of the PACT Act amended 38 U.S.C. 1117 on August 10, 2022, so a qualifying chronic disability now qualifies if it became manifest to any degree at any time. There is no December 31, 2026 cutoff in the controlling statute. VA has not yet updated the text of 38 CFR 3.317, which still prints the old manifestation date, and VA proposed removing it in October 2024. The reproduction below is the regulation as written; where the two differ, the statute controls. The separate requirement that the disability be chronic (generally six months or more) has not changed, and manifestation alone does not by itself establish a compensable evaluation or the other elements of a claim.
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

Six more countries added by statute (undiagnosed illness and MUCMI)

The list above is the regulation's theater definition. 38 U.S.C. 1117(f), as amended by the PACT Act in August 2022, defines a Persian Gulf veteran as one who served in the Southwest Asia theater of operations or in:

Afghanistan
Israel
Egypt
Turkey
Syria
Jordan

On airspace: the regulation expressly includes the airspace above the theater locations in the first list. The statute names these six countries without an airspace clause, so do not assume airspace above them counts for this presumption.

VA has not yet rewritten 38 CFR 3.317(e)(2) to add these six countries, so a copy of the regulation alone will not show them. The statute controls.

Afghanistan under the separate infectious-disease presumption

Afghanistan also appears in a narrower, separate rule. For the nine-infectious-disease presumption in paragraph (c), "qualifying period of service" includes active military, naval, or air service on or after September 19, 2001, in Afghanistan. That infectious-disease rule keeps its own locations and service dates; the expanded list above applies to the undiagnosed-illness and MUCMI path, not to it.

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.

Superseded in part. That date is the regulation as VA last wrote it in September 2021. The statute it implements, 38 U.S.C. 1117(a)(1), was amended by the PACT Act in August 2022 and now reads "became manifest to any degree at any time." The date above no longer limits a claim.

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.

How that definition is applied

Two points that decide most of these cases. First, the definition is written in the alternative: it is enough that either the cause (etiology) or the disease mechanism (pathophysiology) is inconclusive. Both do not have to be. The regulation excludes an illness only where the etiology and the pathophysiology are both at least partially understood, and it names diabetes and multiple sclerosis as its examples of that.

Second, in Stewart v. Wilkie (2018) the Court held that whether an illness is a MUCMI is judged on the individual veteran's own condition and medical record, not on whether medicine generally understands the illness. The three conditions listed above are examples, not a closed list, so a condition's name alone neither wins nor loses the question. Undiagnosed illness and MUCMI also remain separate routes: an undiagnosed illness has no diagnosis that fits, while a MUCMI does have a diagnosis.

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, as amended by section 405 of the PACT Act (Pub. L. 117-168, Aug. 10, 2022). The regulation was originally codified at 75 FR 59970 (Sept. 29, 2010) and last amended at 86 FR 51001 (Sept. 14, 2021), which is before the PACT Act amendment, so the regulation has not been conformed to the current statute.

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 reproduced regulation still carries the former December 31, 2026 manifestation date and the pre-PACT-Act location list, because VA has not amended 38 CFR 3.317 since September 14, 2021. The controlling statute, 38 U.S.C. 1117, has no manifestation deadline and includes six additional countries.

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.