Anderson Cooper Reveals Why He Underwent 'Sudden Surgery'

— -- Anderson Cooper had a good reason for missing work Monday 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."

Cooper, 47, isn't the first TV journalist to recently take time off for his health. Elisabeth Hasselbeck revealed last month that she missed time on "Fox and Friends" to have surgery on a tumor in her abdomen.

"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."