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    How Multiple Sclerosis Changes Over Time

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    Multiple sclerosis (MS) is different for everyone who has it. The symptoms it causes and when they flare up vary not only between people but also throughout one person’s life. This means it can be hard for doctors to diagnose someone with the condition. They might say you "probably" or "possibly" have MS.

    Your diagnosis is based on the symptoms you have, how and when they flare up or improve, which of your body’s functions give you trouble, and your test results. There’s no way to predict how your condition will change throughout your life. It may take time, but as your doctor gets more clues about the type of MS you have, you can have a clearer idea of how it will affect you in the coming years.

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    The way the disease changes and gets worse is different for each of the four types of MS:

    • Relapsing-remitting MS: People with this type have attacks when their symptoms get worse, called relapses, followed by full, partial, or no recovery. These flares seem to change over several days to weeks. Recovery from an attack takes weeks, sometimes months, but symptoms don’t get worse during this time. Most people have this type when they’re first diagnosed with MS.
    • Primary-progressive MS: In this type, symptoms gradually get worse without any obvious relapses or remissions. About 15% of all people with MS have this form, but it’s most common type for people diagnosed after age 40.
    • Secondary-progressive MS: People who get this type usually start with relapsing-remitting MS. Over time, symptoms stop coming and going and begin getting steadily worse. The change may happen shortly after MS symptoms appear, or it may take years or decades.
    • Progressive-relapsing MS: This is the least common form of the disease. Symptoms steadily get worse, but people also have flares that may or may not be followed by some recovery. At first, people with this type may seem to have primary-progressive MS.

    What Is a True Relapse of Multiple Sclerosis?

    An MS relapse starts when nerves in the brain and spinal cord get inflamed (swollen or irritated). Then, those nerves lose the coating, called myelin, that surrounds and protects them. A plaque forms around them instead.

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