Headaches, especially when they occur suddenly and frequently, can signal a serious condition that requires more than an over-the-counter pain reliever.
The Womenshealth.gov says your doctor should evaluate your head pain if you:
Have headaches that occur several times per month and last for hours, or even days, at a time.
Have headaches that interfere with school, work or home.
Have headaches accompanied by vision changes, vomiting or nausea, numbness or tingling.
Have headaches that cause pain around an ear or eye.
Have headaches that are severe and are accompanied by a stiff neck.
Have headaches accompanied by confusion, loss of alertness or convulsions.
Have frequent headaches all of a sudden, when headaches used to be rare.