Why do i get frequent headaches? the pain starts from the sides then go to the center like the bridge of my nose. i have allergic rhinitis. my eyesight seems fine. usually happens while i'm working. is it because of the computer? is this a migraine?

By UPTODATE: the typical presentation of a tension-type headache attack is that of a mild to moderate intensity, bilateral, nonthrobbing headache without other associated features. Descriptions of TTH pain are characteristically nondescript: "dull," "pressure," "head fullness," "head feels large," or, more descriptively, "like a tight cap," "band-like," or a "heavy weight on my head or shoulders."