Sub-occipital Muscle Inhibition in Tension Type Headache

This study is based on the combined application of sub-occipital muscle inhibition technique associated with interferential electrotherapy improves symptoms in patients with tension type headache and cervicogenic headache. The purposes of this study are: * Evaluate the effectiveness of treatment based on the combined application of sub-occipital muscle inhibition technique associated with interferential electrotherapy in patients with tension type headache. * Evaluate the effects of treatment caused in upper cervical movement. * Evaluate the effects of treatment caused in neck pain. * Evaluate the effects of treatment caused in headache.