After cancer and strokes, multiple sclerosis is the commonest incapacitating disease of the central nervous system.

Nerve fibres are covered by a sheath of fatty material or myelin, much like electrical material.

In multiple sclerosis, or MS, the nerves lose this myelin covering, which is replaced by scar tissue.

MS comes on most frequently between the ages of 18 and 30 and is rare after 55, and affects the sexes equally. It is characterised by attacks and then remissions where the symptoms almost disappear, only to reappear weeks, months or even years later.

The cause of MS is unknown, although there are a lot of theories and some facts known about its onset.

In discussing the disease, the British Medical Journal said: “Multiple sclerosis is a chronic debilitating neurological disease that occurs only in man. Its cause is unknown and there is no cure. Each year hundreds of papers about the illness are published and many theories about the causation of the disorder have been put forward, none of which has ever been confirmed.”

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