Geezer Butler had to leave out pages and pages of tales from his memoir to avoid being "sued".

Geezer Butler has lot of untold tales he cannot make public

Geezer Butler has lot of untold tales he cannot make public

The former Black Sabbath star was asked if he is planning to put out another autobiography after releasing 'Into the Void: From Birth to Black Sabbath – and Beyond' - but he says the material he has left could get him into a lot of trouble if he goes public, so it's unlikely.

Speaking to comic Brian Posehn at the 'Filling The Void' event in Colorado, he said: "Um… It depends if I'm gonna get sued or not. [Laughs] 'Cause I had to leave out so much stuff. They were saying, 'Oh, you can't say that.' 'You can't say that.' 'How can you prove that?' and all that kind of thing. So I don't think there would be enough for another one."

The blurb read: "Butler tells his side of the story, from the band’s beginnings as a scrappy blues quartet in Birmingham through the struggles leading to the many well-documented lineup changes while touring around London’s gritty clubs (Eric Clapton, Jimi Hendrix, Frank Zappa, and The Who makes notable appearances!), and the band’s important later years. He writes honestly of his childhood in a working-class family of seven in Luftwaffe-battered Birmingham, his almost-life as an accountant, and how his disillusionment with organized religion and class systems would spawn the lyrics and artistic themes that would resonate so powerfully with fans around the world. Into the Void reveals the softer side of the heavy metal legend and the formation of one of rock’s most exciting bands, while holding nothing back."

In the brutally honest tome, Geezer revealed his battle with depression and self-harm.

The legendary metal band's bassist-and-lyricist opened up in great detail about his battle with his mental health over the years, and how he would cut himself so he wouldn't be focused on his mental state.

In an interview with Uncut magazine, he said: "People didn't understand. You'd go to the doctor and he'd say, 'Go and have a couple of pints' or, 'Go and walk the dog.' I thought, 'Well, that's not going to help me. Nobody talked about it and nobody understood it. I just thought in the end it was a normal thing to be depressed and I started cutting myself to get relief. One day I cut myself so deeply that I couldn't stop the blood. People used to think I was really moody, but it was when the depression hit me I couldn't get out of it, I couldn't talk to people. People used to think I was miserable."

The Ozzy Osbourne-fronted heavy metal band went on to have a huge hit with 'Paranoid', which Geezer penned about mental health, and it wasn't until a long time after then that he decided to seek treatment and he has been on a number of different medications ever since.

The 74-year-old musician said: "Then I wrote the song 'Paranoid' which is all about mental health stuff and it wasn't until ages after that that I went to the doctor and they gave me pills. I had a mental breakdown, went to a doctor in America and he put me on Prozac. After about six weeks on that, the depression started lifting. I've been on various antidepressants ever since."

The band released the LP 'Paranoid' in 1970 and it was a huge success, giving them their first of only two number ones in the UK, along with 2013's '13'.

However, even all the money and success couldn't cure Geezer's depression.

He said: "I enjoyed the success of the album, absolutely.

"People would say you've got all this money coming in, you've got a No 1 album, what have you got to be depressed about? It's like a disease - there's nothing you can do about it, no matter how much money you've got or how happy you are with your job. When you're in it you don't think you're going to get out of it. I'd go into this big black hole. And once you're in it you can't remember what normal life was like.

"People used to think if you were depressed, that you were antisocial, miserable."