head·ache 
/ˈhɛdˌeɪk/ noun
plural head·aches /ˈhɛdˌeɪk/ noun 1 : an ache or pain in the head [count] ▪ I'm starting to get a headache. [noncount] ▪ The symptoms include fever and headache. — see also splitting headache 2 [count] : a difficult or annoying situation or problem
▪ The city's biggest headache is traffic. ▪ Managing your finances can be a real headache.
▪ The city's biggest headache is traffic. ▪ Managing your finances can be a real headache.
— head·achy /ˈhɛdˌeɪki/ adjective [more headachy; most headachy]
▪ I was feeling tired and headachy.
/ˈhɛdˌeɪki/ adjective [more headachy; most headachy] ▪ I was feeling tired and headachy.
