I think a lot depends just on definition... a "mental condition" is anything from being happy, angry, heterosexual, religious.... etc etc" Anything that comes from the mind.
A "mental illness" is subjective. It's something that becomes an "illness" if it is detrimental to that person's life, or others.
So, really it could be either, depending on the person and whether it affects them in a positive or negative way.
I assume "issues" means negative, in which case, I would say no, not usually.