A. Any headache fulfilling criterion C
B. Clinical, nasal endoscopic and/or imaging evidence of a hypertrophic or inflammatory process within the nasal cavity1
C. Evidence of causation demonstrated by at least two of the following:
1. headache has developed in temporal relation to the onset of the intranasal lesion
2. headache has significantly improved or significantly worsened in parallel with improvement in (with or without treatment) or worsening of the nasal lesion
3. headache has significantly improved following local anaesthesia of the mucosa in the region of the lesion
4. headache is ipsilateral to the site of the lesion
D. Not better accounted for by another ICHD-3 diagnosis.
Examples are concha bullosa and nasal septal spur.