Multiple Sclerosis Left Arm Pain

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What Is It?

Multiple sclerosis, sometimes called just MS, is a disabling, neurological illness that affects the brain and spinal cord. The disease also is progressive, meaning it continues to get worse over time.

Nerve cells normally are surrounded by an insulating sheath made of a fatty substance called myelin that helps to transmit nerve impulses. In MS, this myelin sheath is inflamed or damaged, which disrupts or slows nerve impulses and leaves areas of scarring called sclerosis. These areas...

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