THE billionaire Elon Musk has admitted he is "bipolar" and revealed the "great highs and terrible lows" of his life.

Musk spoke out on Twitter after being asked about the "ups and downs" of existence.

5 Elon Musk and his girlfriend, Amber Heard

5 This is the remarkably frank exchange Musk had on Twitter over the weekend

"The reality is great highs, terrible lows and unrelenting stress," he revealed.

"Don't think people want to hear about the last two."

Musk was then asked how he dealt with the stress and responded: "I'm sure there are better answers than what I do, which is just take the pain and make sure you really care about what you're doing."

He was then asked if he was bipolar and answered simply: "Yeah."

However, the tech tycoon backtracked a bit and said he was not "medically" affected by mental illness.

"Bad feelings correlate to bad events," he said.

5 Elon Musk recently unveiled his grand plans to colonise the Solar System Credit: Getty Images

5 5

The Tesla founder's honesty stands in sharp contrast to the guarded nature of other billionaires like Mark Zuckerberg, who shares carefully curated details of his private life on Facebook but never reveals too much.

Last week, Zuck and Musk clashed over the threat artificial intelligence poses to human civilisation.

Musk fears killer computers will wipe out humanity - a view shared by some of the world's brightest minds.

Zuckerberg - who wants to read human thoughts at 100 words per minutes - claimed that super smart computers will help our species, rather than

wiping us off the planet.

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