Jamie Foxx reveals new details about his mystery illness.

abc News - Hollywood actor Jamie Foxx has shared more details about his medical emergency that landed him in the hospital last year.

The Academy Award-winning actor, 56, spoke to a group of fans in Phoenix, Arizona, over the weekend in a video which has since gone viral online.

April 11 last year, bad headache, asked my boy for an Advil. I was gone for 20 days. I don't remember anything," he said.

Foxx further explained how doctors treated him during his health scare.

"We really don't know a lot of specifics when it comes to the medical condition," said Kelley L. Carter, ABC News entertainment contributor and senior entertainment reporter at Andscape. "Whatever he went through, it was obviously very, very serious."

"It seems like Jamie is kind of still trying to process exactly what happened to him," Carter added. "Really wants to hold onto whatever it was that he was going through for some, perhaps, larger moment down the line."