IRCT2014072618604N1 IRCT 2014-12-02 Vice chancellor for research of Shiraz University of Medical Sciences Tension type headache and balance control The effect of releasing trigger points of the neck( Post isometric relaxation) in patients with tension type headache on balance and pain 2013-06-09 anticipated 30 Complete https://irct.ir/trial/16829 interventional Randomization: N/A, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Treatment. 3 Tension type headache. Intervention: Volunteers were initially evaluated in terms of balance and through the post isometric relaxation technique Trigger points in the neck muscles are released and then after Six sessions of treatment again patient balance.