I am experiencing headache (better by: rest, nsaids (ibuprofen, naproxen, etc.)) (time frame: gradual onset) (side: left, right) (occurred: < 1 hr...

Many possibilities: Most people get a headache at some time, such as from colds, infections, lack of sleep, too much driving, long hours on the computer, stress at work, etc... Over-the-counter treatments include Tylenol, (acetaminophen) Motrin, Alleve, Excedrin Migraine, and their generic brands. A bad or increasing headache, recurrent headache, weird headache, or one with other worrisome symptoms should be checked.