Headache or head pain is one of the most common painful conditions. It is estimated that 7 of 10 people will experience a headache at least once a year.
The pain may be isolated to a certain location, occur on one or both sides of the head, radiate across the head from one point, or may be generalized involving the whole head. The headaches can be manifested as sharp or dull pain, or throbbing sensation. Most often they arise spontaneously, but sometimes can be triggered by physical or mental activity, and can last from less than an hour to several days or weeks.