Ozzy Osbourne has spoken out about how his years of drug and alcohol abuse have damaged his short term memory.

He was speaking to a fan and admitted that whilst writing his autobiography, he struggled to recollect certain memories.

“I can remember the '80s vividly. I think my short-term memory is damaged from all the years of abuse; I don't know what I did four seconds ago but I can remember clearly things that happened when I was a kid," he said.

He continued: "The '80s was a fabulous decade. I remember thinking 'Wow, this is great. This is going to last forever.' [My wife] Sharon said to me 'You wait until 1990. It'll all change.' I went 'Naah, it can't be that quick.' Sure enough it changed.

"I don't really remember the '90s. I don't know why. My drug addiction and alcohol addiction were absolutely fierce then. I was just going for it full bore, so there was a lot of blackout time."