Study aim: investigating the effect of dry needling of sternocleidomastoid on pain and disability in patient with cervicogenic headache Design: Quasi-experimental Study, Before and After clinical trial Settings and conduct: Twenty patients with a clinical diagnosis of Cervicogenic headache and active trigger points in the sternocleidomastoid muscle are screen for eligibility criteria. Then the patient is asked to write headache frequency and headache duration (by hours) and headache intensity ( by visual analogue scale ) within 2 weeks and fill Persian version of headache disability questionnaire, after 2 weeks they receive trigger point dry needling of Sternocleidomastoid muscle, and they are requested to write headache frequency and headache duration and headache intensity within 2 weeks after intervention and fill Persian version of headache disability questionnaire again. Participants/Inclusion and exclusion criteria: inclusion criteria: patient with unilateral headache that headache frequency of at least 1 per week over a period greater than 3 months. exclusion criteria: dry needling contraindication, history of diagnosed primary headache Intervention groups: one session dry needling of sternocleidomastoid muscle Main outcome variables: pain and disability in patient with cervicogenic headache