Effects of Osteopathic Treatment in Patients With Tension Type Headache

Inclusion Criteria: They must have tension-type headache, that is, a headache with: * a duration of at least 30 min to days, with or without an break; * must have at least two of the following four characteristics: 1. bilateral location 2. pressure or squeezing quality (non throbbing) 3. weak or moderate intensity 4. not aggravated by routine physical activity such as walking or climbing stairs; * must have both of the following criteria: 1. only one of the following: photophobia, phonophobia, or mild nausea 2. absence of moderate or severe nausea or vomiting. Exclusion Criteria: * They can't be on antibiotics, antivirals, or antidepressants; * They can't have neurological problems; * They shouldn't have any absolute contraindication for the osteopathic maneuvers; * They can't have acute pathologies (ex: infection) or serious (ex: cancer); * They can't have fractures in the skull, cervical spine or high dorsal spine (up to D4); * They can't be pregnant.