Paul Sinha, one of the professional quizzers on ITV's The Chase, has revealed he has Parkinson's disease.
Sinha, a former GP, said he was told he had Parkinson's - a degenerative brain condition - last month.
He said it had been "a really, really tough two weeks" but said he did not "consider himself unlucky".
"Whatever the next stage of my life holds for me, many others have it far worse," he continued.
Sinha said he intended to "keep Chasing, keep writing and performing comedy [and] keep quizzing" while joking that appearing on Dancing on Ice was probably "out of the question".
"A lot of people have asked 'What can I do to help?'" he concluded. "The answer is to treat me exactly the same as before."
Bradley Walsh hosts The Chase, which Sinha joined in 2011. His fellow "chasers" are Anne Hegerty, Mark Labbett, Jenny Ryan and Shaun Wallace.
Last month the BBC's technology correspondent Rory Cellan-Jones revealed he has Parkinson's, whose symptoms include involuntary tremors.