Headache is pain in any region of the head. Headaches may occur on one or both sides of the head, be isolated to a certain location, radiate across the head from one point, or have a viselike quality.
A headache may appear as a sharp pain, a throbbing sensation or a dull ache. Headaches can develop gradually or suddenly, and may last from less than an hour to several days.
Your headache symptoms can help your doctor determine its cause and the appropriate treatment. Most headaches aren’t the result of a serious illness, but some may result from a life-threatening condition requiring emergency care.
Headaches are generally classified by cause