Kanye's never been the same since he lost his mom.

We've all heard that theory before.

But did the death of Donda in 2007 specifically trigger 'Ye's mental breakdown earlier this month?

Sources close to Kanye tell TMZ that they believe the anniversary of his mother's funeral, which was November 20th, contributed to him cancelling the rest of the St. Pablo tour on November 21. 'Ye was hospitalized against his will hours after he announced the cancellation.

Other factors are at play in the breakdown.  Including a lack of sleep, the pressures of touring, and stress related to his wife Kim Kardashian getting robbed in Paris.

Because she was so upset about the robbery, Kim wasn't able to join 'Ye on his tour and provide the emotional support she usually does.

West remains hospitalized, and could be there for some time. According to US Weekly, he's been trying to work while he recovers.

“Kanye keeps wanting to work. At the hospital, he requested that recording equipment be brought to the hospital so he can record in his bed,” a source told Us. “And he has kept asking to see sketches of his fashion lines... He continues to want to work and Kim has to keep telling him to rest."