The Chase star Paul Sinha has revealed he has been diagnosed with Parkinson's disease at the age of 49.

The professional quizzer and comedian posted on Twitter that he "will fight this with every breath I have" before sharing further details of his diagnosis in a blog post, in which he asked to be treated "exactly the same as before".

He said he intends to remain on the ITV quiz show, on which he is known as "The Sinnerman", and to keep writing, performing comedy and quizzing.

In his blog post, the former doctor said he was diagnosed on May 30 after two years of health problems including a frozen right shoulder and Type 2 diabetes.

He wrote: "Nonetheless my reaction was not one of shock. I spent May this year in New Zealand simultaneously having the comedy month of my life, and worrying about why a right-sided limp was now getting worse.

"Behind the facade of the cheerful, late-night comedy festival drunk was a man deeply scared about facing the truth when back in the UK."