MS is an autoimmune dis-ease which means that the body is attacking itself. What? Yes, something is haywire in the body so that is why I say dis-ease- the body isn't at ease with itself for some reason.
With MS, the body is attacking the myelin sheath which is the covering over the nerves. Imagine an electrical cord with holes and nicks in it, the messages can't get from one end to the other without short circuiting.
This is what's happening in the brain to other parts of the body with MS. The various symptoms are numbness, tingling, fatigue, imbalance, memory problems and pain. I mostly experienced dizziness, tingling in my extremities and extreme fatigue.
An experience of fatigue was feeling exhausted from doing nothing or moving a few 100 yards to get a glass of water from the kitchen. I looked fine on the outside but surely didn't feel fine.