This project comprises two studies; a cross-sectional study and a randomized controlled trial. 1. The goal of the cross-sectional study is to compare multiple outcome parameters in different headache types: tension type (TTH), cervicogenic (CGH) and myofascial headache (MFH) as drafted by the International Classification of Headache Disorders (ICHD). Not only will these types be compared against each other, they will also be compared to healthy controls (HC). The main research questions are: * Are the criteria drafted by the International Classification of Headache Disorders (ICHD) discriminative for MFH? * Are there differences between the headache types (and healthy controls) in pain \& disability scores, range of motion (ROM), muscle strength, muscle elasticity and hyperalgesia (=pain pressure threshold, PPT)? Participants will : * Fill out questionnaires about their pain and disability; * Be clinically investigated by a physiotherapist (anamnesis, inspection, examination of movement and structures of the neck and head); * Undergo a testing battery including neck ROM, neck muscle strength \& elasticity and PPT measurement of the C2 processus spinosus, the bilateral upper trapezius muscle and the tibialis anterior muscle of the dominant leg. 2. The goal of this randomized controlled study is to investigate the additional effect of dry needling in the treatment of MFH patients, as compared to a treatment consisting of manual techniques only. The main question it aims to answer is: * Does manual therapy combined with dry needling provide an additional effect on pain, disability and functional outcomes in MFH patients, as compared to manual therapy alone? After the baseline test (see part 1), participants with MFH will be randomly divided to receive 4 sessions over 4 weeks of MT or MT + DN. Hereafter, the baseline test is repeated at 1 week and 3 months post-treatment.