Brock Lesnar may never fight again, says UFC president Dana White

Before Brock: 10 career-ending freak illnesses

Brock Lesnar is fighting an intestinal illness that may claim his UFC career.

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Now UFC President Dana White tells celeb gossip site TMZ that the heavyweight champion has an intestinal disorder that requires "major surgery" and that he may never fight again.

UPDATE: Some are speculating that it might be Colitis.

White tells us Lesnar -- the UFC heavyweight champ -- is "very, very sick" with some sort of intestinal disorder, although listening to White, it sounds a lot more serious than that. White says the condition will require "major surgery."

White is going to visit Lesnar in the hospital and is trying to get him transferred to the Mayo Clinic, one of the most renowned medical facilities in the world.

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White acknowledges the current condition is not mono but he will not be specific. White says the condition is not HIV or cancer.

And, White tells TMZ, "There's a possibility Lesnar will never fight again."