Normally, this myelin coating helps signals to move quickly along your nerve cells. This clever messaging system is responsible for every move you make, every sensation you feel and every memory and thought you’ve ever had.
However, when myelin is damaged by MS, the signals travelling along your nerve cells slow down – a bit like removing the coating around electrical wires. This damage affects those all-important messages (or nerve impulses) that tell other parts of the body what to do.
And once the myelin around the nerve is completely gone, the signal may become blocked altogether. This means messages between your brain and the rest of your body can become disrupted, and it’s this disruption that eventually leads to the various symptoms of MS. It’s also why MS symptoms can be so unpredictable, because there is no way of knowing which messages might be affected.
Take a look at the diagram below to see how your nerve signals can be disrupted in MS: