n. 25B6; noun
I've got a headache : PAIN IN THE HEAD, sore head, migraine; neuralgia; informal head.
(informal) their behaviour was a headache for Mr Jones : NUISANCE, trouble, problem, bother, bugbear, pest, worry, inconvenience, vexation, irritant, thorn in one's flesh; informal aggravation, hassle, pain (in the neck), bind.