VA PTSD service connection: the stressor pathways.

The short version

Most service connection claims ask a veteran to show an in-service event, a current disability and a link between them. Post-traumatic stress disorder has its own rule in 38 CFR 3.304(f), because the in-service event, the "stressor," can be hard to document. The rule keeps the three-part structure but sets out five situations in which the veteran's own account of the stressor may be enough. This page follows the text of 3.304(f) as published in the eCFR, current as of October 29, 2026. It does not say how a given claim will turn out, and nothing here is advice about filing one.

The three required elements

Section 3.304(f) says service connection for PTSD "requires" three things:

1. A diagnosis. Medical evidence diagnosing the condition in accordance with 38 CFR 4.125(a), the section of the rating schedule that addresses the diagnosis of mental disorders.
2. A link. A link, established by medical evidence, between current symptoms and an in-service stressor.
3. Corroboration of the stressor. Credible supporting evidence that the claimed in-service stressor occurred.

The third element is where the five pathways matter. For each, the regulation says that, in the absence of clear and convincing evidence to the contrary, and provided the stressor is consistent with the circumstances, conditions or hardships of service, the veteran's lay testimony alone may establish that the stressor occurred. The first two elements, diagnosis and medical link, are not waived by those paragraphs.

Pathway 1: PTSD diagnosed in service

Paragraph (f)(1): if the evidence establishes a diagnosis of PTSD during service and the claimed stressor is related to that service, lay testimony alone may establish the stressor, subject to the consistency and "clear and convincing evidence to the contrary" conditions described above.

Pathway 2: combat with the enemy

Paragraph (f)(2): if the evidence establishes that the veteran engaged in combat with the enemy and the stressor relates to that combat, lay testimony alone may establish it. The regulation separately says in 3.304(d) that satisfactory lay or other evidence of injury or disease incurred in combat is accepted as proof of service connection if consistent with the circumstances of that service, even without an official record. Whether a veteran "engaged in combat with the enemy" is a factual finding VA makes from the record.

Pathway 3: fear of hostile military or terrorist activity

Paragraph (f)(3) covers a stressor related to the veteran's fear of hostile military or terrorist activity. Here the lay testimony pathway has an additional gate: a VA psychiatrist or psychologist, or one under contract with VA, must confirm that the claimed stressor is adequate to support a PTSD diagnosis and that the veteran's symptoms are related to it. The stressor must be consistent with the places, types and circumstances of service.

The regulation defines the phrase: the veteran experienced, witnessed or was confronted with an event involving actual or threatened death or serious injury, or a threat to the physical integrity of the veteran or others, such as from an improvised explosive device, vehicle-imbedded explosive device, incoming artillery, rocket or mortar fire, grenade, small arms fire (including suspected sniper fire), or an attack upon friendly military aircraft, and the veteran's response involved a psychological or psycho-physiological state of fear, helplessness or horror.

Pathway 4: prisoner of war

Paragraph (f)(4): if the evidence establishes that the veteran was a prisoner of war under 38 CFR 3.1(y) and the stressor is related to that experience, lay testimony alone may establish it. A related paragraph, 3.304(e), tells rating boards that omissions in clinical records made upon repatriation are not determinative, and that they should pay special attention to disabilities first reported after discharge.

Pathway 5: in-service personal assault

Paragraph (f)(5) works differently, because it does not rely on lay testimony alone. It says evidence from sources other than the veteran's service records may corroborate the account. Examples include records from law enforcement authorities, rape crisis centers, mental health counseling centers, hospitals or physicians; pregnancy tests or tests for sexually transmitted diseases; and statements from family members, roommates, fellow service members or clergy. Evidence of behavior changes after the claimed assault is described as one relevant type, such as a request for transfer to another duty assignment, deterioration in work performance, substance abuse, episodes of depression, panic attacks or anxiety without an identifiable cause, or unexplained economic or social behavior changes.

Two procedural protections stand out. VA "will not deny" a PTSD claim based on in-service personal assault without first advising the claimant that evidence from sources other than the service records, or evidence of behavior changes, may be credible supporting evidence, and giving the claimant a chance to furnish it or identify sources. VA may also submit the evidence to an appropriate medical or mental health professional for an opinion as to whether it indicates that a personal assault occurred.

A short comparison

This page covers how PTSD is connected to service, not how it is rated. Ratings for PTSD follow a different part of the regulations.