Inclusion Criteria:  Patients diagnosed with episodic or chronic tension type headache  Exclusion Criteria:  Pregnant women Patients who have received in the previous 3 months some type of treatment for headache Recent history of syncope or seizures Heart / cardiovascular disease Electrical or neurostimulation devices History of intracranial / carotid aneurysm or bleeding; brain tumors / lesions; significant head trauma. Change in prophylactic medication type or dose <1 month before the intervention