Anderson Cooper Reveals Why He Underwent 'Sudden Surgery'

The journalist explained why he wasn't on-air last night.

The anchor revealed on Twitter that he had to have surgery.

"I'll be back on air tomorrow," Cooper wrote. "Had an appendicitis and had to have sudden surgery last night."

"I had a scary week where we didn't know what the results were, but I'm OK. Everything came back OK," the she said. "Surgery is not fun, but ... thankfully I had the blessing of it not being cancer."