Diagnostic criteria:
- Head pain occurring spontaneously as a single stab or series of stabs
- Two only of the following:
- each stab lasts for up to a few seconds
- stabs recur with irregular frequency, from one to many per day
- no cranial autonomic symptoms
- Not fulfilling ICHD-3 criteria for any other headache disorder
- Not better accounted for by another ICHD-3 diagnosis.