I would just leave it at, "I'm unemployed right now due to health issues" People only ask because, like you say, it's just "normal society stuff." We have to start someplace to express an interest in another. But if you "lie" then you can never get much deeper with a person without having to reveal the lie. I don't think anyone is going to ask about "what" health issues or what you do for money, etc. right off the bat, that would be intrusive/socially rude and if they do, you immediately know you're probably not interested in getting to know that person much better.