headache headache /ˈhɛˌdeɪk/

noun

1. () Something or someone that causes anxiety; a source of unhappiness  ( vexation , concern , headache , worry )
   something or someone that causes anxiety; a source of unhappiness
    New York traffic is a constant concern
   New York traffic is a constant concern
    It's a major worry
   it's a major worry
   
2. () Pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs  ( cephalalgia , head ache , headache )
   pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs
    I have a headache and need to take some painkillers
   I have a headache and need to take some painkillers