Tension Headaches: Symptoms, Causes, & Treatments

“Tension-type” headaches are the most common type of headaches among adults. They used to be commonly referred to as muscle contraction headaches or stress headaches, but these old terms are no longer used. A tension-type headache may appear periodically (episodic, fewer than 15 days per month) or chronically (more than 15 days per month).

https://my.clevelandclinic.org/health/diseases/8257-tension-type-headaches