How common are tension type headaches and what are the clinical features
The 1-year prevalence of the episodic type is 38% and chronic (15 or more days per month for 3 or more months) is 2%.
Most have headaches less than 1 day per month.
The typical headache is a bilateral mild to moderate intensity, nonthrobbing headache described as dull, pressure, a tight cap, band, or a heavy pressure without associated symptoms.
The headache is unilateral in 10% and occasionally pulsating.
Stress is a common trigger.