Robbie Williams says he’s been battling an illness for years that has made him “lethargic and depressed.”

He said he was recently diagnosed with the mystery problem but had been suffering for four years.

Rob explained: “I thought I was lethargic and depressed as a person, I thought that was my make-up.

“I found out a few months ago that I'd been ill, completely by mistake, and I don't want to go into the whys and wherefores, but what I had made you lethargic and made you depressed and I'd had it for years and not known.”

Hopefully the Shame singer will feel less depressed later this year when he gets back with Take That for live dates and the release of a new album.