Actor Charlie Sheen thinks he has bipolar disorder amid continued battle against HIV.

The Anger Management star said various medical experts have warned him he could suffer from the condition, which typically sees sufferers experience bouts of both depression and manic behaviour, reported Daily Mirror.

"I’ve been described or diagnosed by enough people that I guess at some point you have to take a look at it… Manic behaviour is usually in the throes of departing substance abuse and drinking. It doesn’t really happen when I’m not doing that," he said.

But the 50-year-old star said he has never viewed his mood swings as a problem.

"They’ve always seemed normal to me. hat’s as honest as I can be. I’ve just accepted it as part of my make-up. I don’t look at it as mania, I just look at it as the very…interesting universe."