How severe will my symptoms get?

The rate at which symptoms will progress and how severe they will become is impossible to predict. In general, the course is a slowly progressive one. Some individuals report periods of acceleration, while others have long plateaus where progression appears to stop.

Researchers believe it can take several years for all parts of the body to become affected. An individual’s genes, environment, nutrition, general health, and other factors may influence the rate of progression and severity of the disease.