- Any headache fulfilling criteria C and D
- Trauma or injury to the head and/or neck of a type not described above has occurred
- Evidence of causation demonstrated by either or both of the following:
- headache has developed in close temporal relation to the trauma or injury
- other evidence exists of causation by the trauma or injury
- Headache persists for >3 months after its onset
- Not better accounted for by another ICHD-3 diagnosis.