Signs that you’re experiencing a tension headache can include: 

Dull, aching head pain
Lots of pressure and tightness across the forehead
Muscles aches or pains on the sides and back of your head
Sensitivity to loud noises

Tenderness when you touch your hair line, scalp, neck and shoulders
There is more than one type of tension headache, so doctors usually split tension headaches into two main divided categories that describe how often they occur: either episodic headaches (which happen now and then) or chronic headaches (which are experienced much more often). 

Episodic tension headaches tend to occur fewer than 15 days of the month (for example, every other day or a few times per week), while in contrast, chronic tension headaches can happen much more often - for some people even nearly every day. Episodic headaches usually last for about 30 minutes to a few hours, but at times they can linger for as long as one week.

Chronic tension headaches usually last at least several hours and are more likely to be continuous, causing nagging pain that won’t seem to quit. Doctors consider someone to suffer from chronic headaches if more days than not he or she deals with head pain. It’s also possible to start off having only episodic tension headaches now and then, but soon notice that they become more frequent and chronic in nature.