'Jeopardy!' host Alex Trebek is taking medical leave after undergoing surgery to remove blood clots from his brain.
The 77 year old was diagnosed in mid-December with a subdural hematoma, a complication from hitting his head in a bad fall in October.
A subdural hematoma is considered among the deadliest of all head injuries.
He underwent surgery the following day.
Slurred speech, headaches, problems with balance or walking and nausea can be signs of subdural hematoma.