2.4.1 Probable infrequent episodic tension-type headache

Diagnostic criteria:
A. One or more episodes of headache fulfilling all but one of criteria A-D for 2.1 Infrequent episodic tension-type headache
B. Not fulfilling ICHD-3 criteria for any other headache disorder
C. Not better accounted for by another ICHD-3 diagnosis.