The sometimes dull or searing ache/pain that can persist through the side, front or back of your head. Headaches are random but can be caused by various things, e.g., people yapping in your ear, stress or an annoyance or exposure from a machine, animal or human nearby. The only ways to cure a headache or migraine are rest, fluids and headache pills.
Ugh, that Science test yesterday gave me such a HEADACHE!
John, could you please shut up? You're giving me a headache.