toothache

Hello!!

Is it correct to say "I have a toothache"?[is the article 'a' correct here?]

or is it more correct to say "an aching tooth?"

Thank you

toothache is correct.

It is ''a toothache'' not ''an toothache''. And yes, ''toothache'' is correct.

the question was about the article 'a'

whether it should be 'a toothache' or just just 'toothache' without 'a'

"I have toothache" is wrong. "I have aching tooth" is wrong for the same reason. Singular nouns get articles.