Gulf War illness presumptions: what 3.317 says.

The short version

Section 3.317 covers two different ideas that are often lumped together as "Gulf War illness." The first is a compensation rule for chronic disabilities that doctors cannot pin to a known cause. The second is a list of nine infectious diseases that are presumed service connected if they appear in a veteran with qualifying service. This page explains both using the eCFR text current through October 29, 2026. It reports what the regulation says and does not give a view on any individual case.

One date to notice: December 31, 2026

The qualifying chronic disability rule in 3.317(a)(1)(i) requires that the disability became manifest "either during active military, naval, or air service in the Southwest Asia theater of operations, or to a degree of 10 percent or more not later than December 31, 2026." That end date appears in the text as published as of October 29, 2026. The page you are reading cannot tell you whether the date will be extended or changed, and the live eCFR section is the place to check. If you are weighing a deadline, confirm the current text and speak to an accredited representative.

Part one: the qualifying chronic disability

Under 3.317(a)(1), VA will pay compensation to a Persian Gulf veteran who exhibits objective indications of a qualifying chronic disability, provided that the disability (i) met the timing rule above, and (ii) "by history, physical examination, and laboratory tests cannot be attributed to any known clinical diagnosis."

"Qualifying chronic disability" is defined in (a)(2) as a chronic disability resulting from an undiagnosed illness, or from a medically unexplained chronic multisymptom illness defined by a cluster of signs or symptoms, "such as" chronic fatigue syndrome, fibromyalgia, and functional gastrointestinal disorders (excluding structural gastrointestinal diseases). The regulation's note explains that functional gastrointestinal disorders are conditions with chronic or recurrent symptoms unexplained by structural, endoscopic, laboratory or other objective signs, and names irritable bowel syndrome, functional dyspepsia, functional vomiting, functional constipation, functional bloating, functional abdominal pain syndrome and functional dysphagia as examples, adding that diagnosis generally requires symptom onset at least 6 months before diagnosis and symptoms sufficient to diagnose the specific disorder at least 3 months before diagnosis. The definition also says illnesses of partially understood cause, such as diabetes and multiple sclerosis, are not considered medically unexplained.

What "objective indications" and "chronic" mean here

Paragraph (a)(3) says objective indications of chronic disability include both "signs," meaning objective evidence perceptible to an examining physician, and other non-medical indicators that are capable of independent verification. Paragraph (a)(4) defines chronic in months: disabilities that have existed for 6 months or more, and disabilities with intermittent episodes of improvement and worsening over a 6-month period, are chronic. The 6-month period is measured from the earliest date on which the evidence shows the signs or symptoms first became manifest.

Paragraph (b) lists signs or symptoms that may be manifestations: 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; and menstrual disorders. The list says "include, but are not limited to," so it is illustrative, not exhaustive.

How the condition is rated and when compensation is not paid

A qualifying chronic disability is rated using Part 4 criteria for a disease or injury with similar functions affected, anatomical localization or symptomatology, and is service connected for purposes of all laws of the United States (3.317(a)(5) and (6)). Paragraph (a)(7) bars compensation if there is affirmative evidence that the disability was not incurred during Southwest Asia service; that it was caused by a supervening condition or event between the veteran's last departure from service there and the onset; or that it is the result of willful misconduct or abuse of alcohol or drugs.

Part two: nine infectious diseases

Paragraph (c) presumes service connection for these diseases if they become manifest in a veteran with a qualifying period of service: brucellosis, Campylobacter jejuni, Coxiella burnetii (Q fever), malaria, Mycobacterium tuberculosis, nontyphoid Salmonella, Shigella, visceral leishmaniasis and West Nile virus. With three exceptions, the disease must have become manifest to 10 percent or more within one year from separation from the qualifying service. Malaria may also qualify when treatises indicate the incubation period commenced during qualifying service, and there is no time limit for visceral leishmaniasis or tuberculosis.

A qualifying period of service means a period meeting paragraph (e), or active service on or after September 19, 2001 in Afghanistan. Paragraph (d) adds a table of long-term health effects potentially associated with these diseases. If a veteran with a presumed disease also has a column-B condition, VA must decide from the evidence whether the infection caused it, and requests a medical opinion on whether it is at least as likely as not.

Where the "Southwest Asia theater of operations" is

Paragraph (e)(2) lists it: 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, and the airspace above these locations. A Persian Gulf veteran is a veteran who served in that theater during the Persian Gulf War.

A worked example of the six-month rule

A veteran serving in Kuwait notes joint pain and fatigue in March, which continue with ups and downs, and sees a doctor in the autumn who finds no known diagnosis. If the earliest evidence of the symptoms is in March and the examination is in October, the 6-month period measured from March has been met. If the earliest evidence were only two months before the exam, the "chronic" test in (a)(4) would not yet be met on those facts. The checker below does this simple comparison and the date comparison; it does not decide whether a diagnosis exists.