Headache in the presence of a non-infectious inflammatory intracranial disease, usually with lymphocytic pleocytosis in the cerebrospinal fluid. It remits after resolution of the inflammatory disorder.
A. Any headache fulfilling criterion C
B. A non-infectious inflammatory disease known to be able to cause headache has been diagnosed
C. Evidence of causation demonstrated by either or both of the following:
1. headache has developed in temporal relation to the onset of the non-infectious inflammatory disease
2. either or both of the following:
a) headache has significantly worsened in parallel with worsening of the non-infectious inflammatory disease
b) headache has significantly improved in parallel with improvement of the non-infectious inflammatory disease
D. Not better accounted for by another ICHD-3 diagnosis.