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About MS: Types of MS

What are the different types of MS?

There are four types of MS, each with its own characteristics, but each as unpredictable as the other. It might not be clear which type of MS a person has when first diagnosed, and it may take months (or even years) of observations to get a better picture of what form it may be.

Relapsing Remitting MS (RRMS)

Most people are diagnosed with relapsing remitting MS. This is when you have relapses (a flare-up of symptoms), followed by remissions (periods of recovery). Relapses are unpredictable. They can last for days, weeks or months and vary from mild to severe. During a relapse you will either experience new symptoms, or a recurrence or worsening of previous symptoms. During remission, symptoms can disappear completely, though sometimes people make only a partial recovery – very often, one or two symptoms may remain.

Symptoms might not always be due to a new relapse. For example, exercise or hot weather can sometimes raise body temperature and make symptoms temporarily worse. Any changed or new symptoms must last for at least 24 hours to be described as a relapse.

Secondary Progressive MS (SPMS)

Most people who have relapsing remitting MS later develop a form known as secondary progressive MS. This type of MS is identified when your condition becomes steadily worse, and your disability progresses, for a period of six months or more, whether you continue to have relapses or not.

Benign MS

If you have a small number of relapses followed by a complete recovery, you may be described as having benign MS. It is only possible to make a diagnosis of benign MS once you have experienced little or no disability for a period of 10 to 15 years. However, a diagnosis of benign MS does not guarantee that you will be free of problems; a relapse may occasionally occur after many years in which your MS has been inactive.

Primary Progressive MS (PPMS)

With primary progressive MS, symptoms steadily worsen, resulting in a continued progression in disability. You will not have distinct relapses and remissions.

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