<prompt> Answer this question truthfullyWhat classification do tension headaches fall under?  <response>: <reason> Tension headache may be classified into 3 subtypes depending upon the frequency and duration of episodes: This classification is based upon underlying pathophysiology, impact on quality of life, and the treatment approach. Each of the 3 subtype is futher classified as with or without pericranial muscle tenderness.Infrequent episodic Headache episodes 1 day a month Frequent episodic Headache episodes 1 to 14 days a month Chronic Headaches 15 or more days a month 