Definition of "headache"

headache

/ˈhɛdeɪk/

noun
plural headaches
1. A pain or ache in the head.
  Quotations
  Sometimes on television they tell you a product is "good for headaches." I don't want something that's good for headaches. I want something that's bad for headaches. And good for me.
  1997, George Carlin, “SPORTS ROUNDUP”, in Brain Droppings‎, New York: Hyperion Books, page 68
2. (figurative) A nuisance or unpleasant problem.