I have daily headache. but why i don't know please answer. ?

That's not good: 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 items some people try include Tylenol, Motrin or Advil, Alleve, Excedrin, or their generic brands. A severe, increasing, recurrent (as in this case), or weird headache, or one with other worrisome symptoms, must be evaluated.