Some Gulf War veterans have real, documented symptoms that no diagnosis explains. The VA addresses that directly in 38 CFR 3.317, a regulation written specifically for undiagnosed illnesses.
This guide explains what that regulation covers, drawing only on the VA's own published sources. For the broader picture, see our presumptive conditions overview.
Who the regulation covers
The rule applies to veterans with qualifying service in the Southwest Asia theater of operations. The VA's Gulf War illness page lists the covered locations and the service period, which begins August 2, 1990.
Undiagnosed illnesses
Under the regulation, an undiagnosed illness is one with objective signs or other non-medical indicators that cannot be attributed to a known diagnosis. Symptoms named in the regulation include fatigue, joint and muscle pain, headache, neurological and neuropsychological signs, respiratory signs, sleep disturbances, gastrointestinal signs, cardiovascular signs, weight loss, and menstrual disorders.
Chronic multisymptom illnesses
The regulation also covers medically unexplained chronic multisymptom illnesses, and names chronic fatigue syndrome, fibromyalgia, and functional gastrointestinal disorders as examples.
The illness has to be chronic - the regulation describes symptoms lasting six months or more - and has to reach a compensable degree of severity under the rating schedule.
Where veterans start
Every case is different, and there is no obligation at any step. When veterans want to understand what their records actually support, these are the two most common starting points:
- Medical records review
A licensed physician reviews your records for a $250 flat fee and identifies which conditions the available evidence may support. The fee is refunded in full if nothing supportable is identified.
- Nexus letter
When the records support one, a licensed provider writes the medical opinion that addresses the link between your condition and your service.
Timing
The condition must appear either during qualifying service or by the deadline the regulation sets for post-service onset. The current text of 38 CFR 3.317 states that date, and it has been extended several times, so the regulation itself is the reliable source.
Where medical evidence fits
Because these claims turn on documented symptoms rather than a diagnosis, the medical record does a lot of work. Where a diagnosis does exist and the symptoms fall outside the regulation, the claim may run on direct or secondary connection instead - see our guides on how VA service connection works and when a presumptive claim still needs medical evidence.
This guide is educational. It summarizes the VA's own published rules and links to the exact sources it relies on. It is not legal or claims advice, and it is not a substitute for an accredited representative, who can advise you about your specific claim. Accredited help is free - search the VA's accreditation database to find a Veterans Service Organization, accredited agent, or attorney.
Frequently asked questions
What is Gulf War illness in VA terms?
The VA uses 38 CFR 3.317 to compensate qualifying Gulf War veterans for undiagnosed illnesses and certain medically unexplained chronic multisymptom illnesses, without requiring a diagnosis linking the symptoms to service.
Which conditions are named in the regulation?
38 CFR 3.317 specifically names chronic fatigue syndrome, fibromyalgia, and functional gastrointestinal disorders such as irritable bowel syndrome, alongside undiagnosed illnesses with objective signs.
Does Gulf War service mean only 1990 and 1991?
No. The VA defines the Southwest Asia theater of operations period as beginning August 2, 1990, and continuing through a date not yet set by law, so later service in the covered area can qualify.