How does multiple sclerosis spread to other parts of the body?

Immune system: Ms is thought to be mosly caused when the immune system attacks the cells which make the white matter covering on neurons. Since the immune system is all over the body, this is how various parts of the nervous system are affected.

See answer: Ms affects the brain and spinal cord, not the nerves outside. The messages from the brain and spinal cord can be affected so the message to the peripheral nerves are affected.

It doesn't: MS affects brain, spinal cord, and eyes. Does not directly affect other internal organs or "spread".