Following news of his hospitalization earlier this week, Diamond's team confirmed the actor's diagnosis on Thursday.
"We can confirm that Dustin does have cancer," the actor's rep tells PEOPLE. "It's very serious, though we are still waiting for more details, which we will have shortly."
"He's in a lot of pain," the rep adds.
Diamond's rep told Entertainment Weekly that the star is "undergoing chemo" for cancer and will remain at the hospital for "at least another week and then we will figure out when he gets to come home."
Many years ago, before all of the video appearances on Cameo or whatever, my ex-girlfriend's family hired him for cheap to see how it would go.
He was such a dick and wouldn't take pictures or answer any questions and they all just wound up making fun of him the whole night. Talk about getting your money's worth?
That's odd because most of them have posted on social media wishing him well.
This is not the first time I've heard about Screech's poor reputation. Child stars have been known to be a bit ... out of their own heads.
But, stage 4 what? Lung, Brain? Pancreatic? Colon? ... no report is specific to what he has.
I also heard he was a bit of a dick. He wrote a book about his years on the SBTB show and obliterates his other cast mates in writing. But, it doesn't surprise me they are forgiving him at this time.
There is no stage 5. There is 4 and then there is death.
I hate cancer - no matter who has it.
Good luck to him.