Christina Applegate has revealed she has been diagnosed with multiple sclerosis (MS) in an emotional post on social media.

The actress tweeted on Tuesday: “Hi friends. A few months ago I was diagnosed with MS. It’s been a strange journey. But I have been so supported by people that I know who also have this condition. It’s been a tough road. But as we all know, the road keeps going. Unless some asshole blocks it.”

Applegate added:  “As one of my friends that has MS said ‘we wake up and take the indicated action’. And that’s what I do. So now I ask for privacy. As I go through this thing.  Thank you xo.”

Christina was an original member of The Pussycat Dolls, starred in hit US sitcoms Jesse and Samantha Who? As well appearing in two Anchorman movies.

Christina Applegate won a Primetime Emmy for her guest appearance as Rachel's sister in Friends in two episodes in 2002 and 2003.