In addition to persistent cash burn problem, Tesla CEO Elon Musk has admitted he is also bipolar.

In a series candid of tweets on Sunday, one day after delivering the first production Model 3, Musk replied to questions by other Twitter users about his mental state, shedding some light on the inner turmoil he struggles with. Asked "whether the the ups and down he had make for a more enjoyable life", Musk responded "The reality is great highs, terrible lows and unrelenting stress. Don't think people want to hear about the last two."

The reality is great highs, terrible lows and unrelenting stress. Don't think people want to hear about the last two. — Elon Musk (@elonmusk) July 30, 2017

Turns out people did, and when asked if Musk was bipolar, he answered "Yeah" adding in a follow-up tweet that "maybe not medically tho. Dunno. Bad feelings correlate to bad events, so maybe real problem is getting carried away in what I sign up for."

Maybe not medically tho. Dunno. Bad feelings correlate to bad events, so maybe real problem is getting carried away in what I sign up for. — Elon Musk (@elonmusk) July 30, 2017

Musk said that his way of dealing with the lows is to "take the pain and make sure you really care about what you're doing."

"If you buy a ticket to hell, it isn't fair to blame hell…" he said.

If you buy a ticket to hell, it isn't fair to blame hell ... — Elon Musk (@elonmusk) July 30, 2017

His final tweet on the topic: "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"

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 — Elon Musk (@elonmusk) July 30, 2017

While unclear if related, last week Facebook founder Mark Zuckerberg and Musk traded insults over the threat artificial intelligence poses to human civilisation. As we reported recently, Musk reveals an apocalyptic vision in which he 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.