Chris Pizzello, Invision
In this April 30, 2017, file photo, Alex Trebek speaks at the 44th annual Daytime Emmy Awards at the Pasadena Civic Center in Pasadena, Calif.

SALT LAKE CITY — Jeopardy! Host Alex Trebek just revealed that he has Stage 4 pancreatic cancer.

He said, "I'm going to fight this. And I'm going to keep working."

Trebek is 78 years old, according to The Hollywood Reporter.

Social media cheered for Trebek, hoping he can fight the cancer diagnosis.