Christina Applegate is letting fans in on some of the details of her struggle against MS over the past three years.

Along with these celebrities, close to a million people in the U.S. have been diagnosed with the autoimmune disorder, according to the National Multiple Sclerosis Society. Here's what MS is ...

Here's what MS is, what causes it and how you can expect the condition to be treated if it impacts you or someone you love.

"They've done every test known to man on me, put so much radiation into my body from CT scans to everything else," the "Dead ...

Actress Christina Applegate has revealed startling details about her three-year battle with multiple sclerosis, including ...