Table 2.

Cervicogenic headache diagnostic criteria (ICHD 2^nd Edition)

A.	Pain, referred from a source in the neck and perceived in one or more regions of the head and/or face, fulfilling criteria C and D.
B.	Clinical, laboratory and/or imaging evidence of a disorder or lesion within the cervical spine or soft tissues of the neck known to be, or generally accepted as, a valid cause of headache.
C.	Evidence that the pain can be attributed to the neck disorder or lesion based on at least one of the following:
	1. Demonstration of clinical signs that implicate a source of pain in the neck.
	2. Abolition of headache following diagnostic blockade of a cervical structure or its nerve supply using placebo- or other adequate control.
D.	Pain resolves within 3 months after successful treatment of the causative disorder or lesion.

Key: ICHD international classification of headache disorders