COLUMBUS, Ohio (WCMH) — Actress Christina Applegate made a surprising announcement from early Tuesday.

The film and television star revealed on Twitter that she was diagnosed with multiple sclerosis a few months ago: “It’s been a strange journey. But I have been so supported by people that I know who also have this condition.”

The reveal of Applegate’s health battle is leading to a lot of online conversation about the disease.

Jennifer Bullock spoke with Dr. Jacqueline Nicholas, the System Chief of Neuroimmunology & Multiple Sclerosis at OhioHealth about it. You can watch it in the player above.