Headaches have been listed as 1 of the 10 most disabling conditions worldwide. (Stovner et al., 2007) and cervicogenic headaches (CeHs) comprise 15% of the individuals with these complaints. (Nillsson, 1995); (Fernandez de-las-penas et al., 2005) The current best approach to the conservative care of this condition has yet to be determined. The primary aim of this study is to determine whether individuals with CeHs will respond to a program of thoracic spine thrust manipulation in isolation. This may further the current body of evidence by offering an alternative, potentially safer approach to the conservative care of individuals with this condition. Additionally, results of this study may serve to drive a larger scale Randomized Clinical Trial (RCT) by offering information regarding feasibility of recruitment of individuals with chronic CeHs as well as timing and dosing of the intervention.