What is tension-type headache?

Tension-type headache is typically bilateral, pressing or tightening in quality, and of mild to moderate intensity. The headache lasts from 30 minutes to 7 days. The pain does not worsen with routine physical activity and is not associated with nausea, although light sensitivity or sound sensitivity may be present. If tension-type headache is chronic, or occurring on 15 or more days per month for at least three months, then the headache may be associated with no more than one of light sensitivity, sound sensitivity, or mild nausea. 

Tension-type headache is the most common primary headache in the population and is commonly associated with migraine. Tension-type headache can be associated with tenderness in the muscles around the head.