Nearly 24 hours after Kanye West's hospitalization, new details are still coming to light.
The 39-year-old rapper was hospitalized in Los Angeles on Monday after canceling the remaining dates of his Saint Pablo tour.
WATCH: Kanye West Hospitalized After Cancelling U.S. Tour Dates, Bizarre Onstage Behavior
Here's everything we've learned so far:
1. What happened to West?
A source claims to ET that "Kanye had a mental breakdown," in large part due to his busy work schedule. "It was a combination of a lot of issues: stress, anxiety, paranoia. He just broke. I think a lot of people realized he couldn't do it all, even though he tried, and he just broke down."
In addition to the rapper's recent tour cancellation and curious Instagram postings, the source says that "there have been signs recently of him just overwhelmed. He has a lot going on: multiple fashion lines, the tour, his business, being a father."
Besides his own responsibilities, the source also adds that Kim Kardashian West's Paris robbery last month also "threw him for a big loop," while noting that "his mother [Donda West] passed away this time of year, so there is a lot going on right now. Kanye hasn't been himself for a while."
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"Before Paris, there were a lot of things Kanye committed to work-wise that he couldn't cancel," the source adds. "All he wanted to do was stay home with Kim and the kids, and he couldn't. He barely canceled anything, not realizing his family really needed him. He realized he couldn't do it all and just broke. He's in a bad place."
"The guy just needs some rest," another source reveals, adding that the rapper is suffering from sleep deprivation and exhaustion.
2. Where was West and who was he with when he was taken to the hospital?
A source confirms to ET that West was at personal trainer Harley Pasternak's home at the time, where he was "strongly convinced to go to the hospital for his own well-being and safety." "Harley and Kanye have been close for years," the source says, adding that Pasternak has accompanied West on many of his tours, though not for Saint Pablo.
WATCH: Janelle Monae, Emile Hirsch and More Celebs Offer Support for Kanye West Amid Hospitalization
3. Did West assault someone?
Despite reports that West allegedly attempted to assault a staff member at Pasternak's gym before his hospitalization, a source close to West tells ET, "[There was] no assault, no fight."
4. Where is West now?
A source tells ET that the "Fade" rapper is currently at UCLA Medical Center, where TMZ reports his personal physician, Dr. Michael Farzam, requested that West be transferred and put on a 5150 involuntary psychiatric hold.
WATCH: EXCLUSIVE: Kim Kardashian 'Terrified' After Kanye West's Hospitalization: He 'Hasn't Been Himself in a While'
5. Where was Kim Kardashian West and how did she react?
ET's source says that West's wife was in New York City for a few hours on Monday before flying back to Los Angeles to be with her husband. Kim landed at around 10:30 p.m. and headed straight to UCLA Medical Center. The Keeping Up With the Kardashians star was expected to make her first public appearance since her Paris robbery at the Angel Ball, a black-tie event honoring her late father, Robert Kardashian.
"Kim was terrified," the source adds. "She was so scared when she heard the news and rushed to his side. There was no question about her staying in NYC. She had to be with him last night."
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