Tension-type headache (TTH) is commonly used to describe a chronic head-pain syndrome characterized by bilateral tight, bandlike discomfo. The pain typically builds slowly, fluctuates in severity, and may persist more or less continuously for many days. The headache may be episodic or chronic (present >15 days per month). TTH are completely without accompanying features such as nausea, vomiting, photophobia, phonophobia, osmophobia, throbbing and aggravation with movement. The pain of TTH can generally be managed with simple analgesics such as acetaminophen, aspirin, or NSAIDs. Behavioral approaches including relaxation can also be effective. Ref: Harrison's Internal Medicine, 18th Edition, Pages 120-122, 114-120, 122, 3360-3361