What is the prognosis for primary progressive multiple sclerosis?

As with multiple sclerosis in general, the prognosis varies in PPMS. Most people start to have symptoms at about age 50 or older, or about 10 years later than is typical of relapsing forms of MS. A recent Canadian study showed that many people with PPMS were able to walk years after a diagnosis, but usually patients tended to get worse over time. This worsening usually affected the ability to walk and was less likely to cause visual symptoms or tremor. Generally, thinking, memory, and intellect are relatively spared with PPMS. People who have PPMS may also have bowel, bladder, and/or sexual problems.

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