Céline Dion was diagnosed with stiff-person syndrome – what is it?

This disorder is incredibly rare.

Learn more about the disease, how it affects the body, and how it can be managed.

Comedian Amy Schumer says she’s been diagnosed with the rare condition. Find out how she realized something was wrong.

Learn more about amyotrophic lateral sclerosis (ALS), a rare but devastating disease.

Know the causes, symptoms and treatment of this nerve disorder.

More than 80 percent of people with this autoimmune disease don't know they have it. Can you recognize the symptoms?