In a separate Tweet, the Married With Children star added a piece of advice she received from another friend with M.S. "As one of my friends that has MS said 'we wake up and take the indicated action,'" she wrote. "And that's what I do. So now I ask for privacy. As I go through this thing. Thank you xo."

Applegate has been open in the past regarding her health struggles. In 2008, she was diagnosed with breast cancer during an M.R.I., and went on to have a double mastectomy. She started a foundation, called Right Action for Women, which offers free MRIs for high risk women, according to Entertainment Tonight.

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