“Depending on the type of MS you have, your symptoms may come and go in phases or get steadily worse over time (progress),” the NHS adds.
The onset of symptoms is regarded as “unpredictable”, and while the condition is caused by the immune system turning on the brain and nerves, it’s not yet understood why this happens.
“It may be a combination of genetic and environmental factors,” the health body theorises.
The autoimmune condition can be picked up on an MRI scan as the myelin sheath, that layers the nerves, will be inflamed.