Frankie Muniz has revealed the truth behind rumours that he has no memory of appearing in Malcolm in the Middle due to suffering numerous concussions.

Muniz played the titular role in the popular family sitcom from 2000 to 2006, alongside Bryan Cranston, Christopher Kennedy Masterson and Jane Kaczmarek.

The show centred on child-genius Malcolm and his dysfunctional family - mum Lois (Kaczmarek), dad Hal (Cranston) and brothers Frances (Kennedy Masterson), Reece (Justin Berfield), Dewey (Erik Per Sullivan) and Jamie (James and Lukas Rodriguez).

Appearing on Steve-O’s Wild Ride last year, the former child star cleared up long-standing rumours that he couldn’t remember being in Malcolm in the Middle, but did share that he had problems with his memory.

Fox

Muniz explained that when he appeared on Dancing with the Stars there was an episode based upon the contestants ‘most memorable year’. He was then told his would be 2001 - the year he was nominated for an Emmy and Golden Globe for Malcolm in the Middle - when he was just 15.

“I go, ‘I don’t remember what I felt then',” Muniz explained.

“It was me blowing off the fact that I can’t say that’s my favourite year because I can’t tell you what happened in 2001. You would have to tell me what happened in 2001.

"They didn’t really say it. The storyline in my episode then, as cheesy as it is, I said my most memorable year is the present because I’ve learned through my past to live in the moment.

"Accept everything for what it is. I had to say I don’t really remember, but I wasn’t saying I don’t remember anything.

"If you told me what I ate for breakfast the day I was nominated for an Emmy, I have no idea.”

Steve-O's Wild Ride! YouTube

He went on to insist that his memory is really not as bad as people have previously believed.

When asked if he thought the memory issues stemmed from the fact he had numerous concussions over the years, he replied: “I just think it’s the fact that I did so f***ing much in that timeframe that of course I can’t remember all of it.

“I have some memories. There’s definitely things that pop up and I go whoa.

"A lot of my memories now are almost like I can’t distinguish if it’s a dream or it was reality. Places I went, people I hung out with… did I really do that?”

Muniz also addressed rumours that he would often experience 'mini-strokes', which he clarified, isn't the case.

The star revealed that the transient ischemic attacks he would suffer are those of aura migraines, and although they share the same symptoms of a mini-stroke, aren't the same thing.