The source of the trauma, according to Tyson, was a 2.5-inch bleeding ulcer.

He was not completely surprised, as the three-part documentary shows. Episodes 1 and 2 premiere Thursday.

Reflecting on a week and a half before the incident, Tyson said: “I was doing great and then suddenly I started feeling tired and I explained to my trainer, I don’t know what’s wrong with me.”

Tyson, who was taken to a hospital after landing at Los Angeles International Airport, said he lost 26 pounds after the ulcer.

“Can you imagine that?” he said.

The weight loss wasn’t the only thing he said he found troubling.

“I asked the doctor, ‘Am I going to die?’ Tyson remembers. “And she didn’t say no. She said we do have options. Then I got nervous.”