MS is a chronical inflammation of the Central Nervous System. The medical symptomatic originates in the damage of the boundary line around the nerve fiber which is characteritical for this disease. Latest findings show that the nerve fibers get partly damaged, too. Pre-condition for this is the collapse of the blood vessel system.
MS is being associated with Automimmune diseases. This means that the inflammation is the result of systematic immune reaction of the immune system against the own body.
The more and the longer the disease is active, the less possiblity excists for the nerve tissue to renew damaged boundary lines. This leads to an increasing number and size of scars (= multiple sclerosis), which again results in the deficit of electric conductivity of the nerve fibers.
The manifold apperance of the disease depends on the number but also on the position of these cicatrization. With fortunate progression the disease can even come to a standstill for several years or even decades. After individual active phases the symptoms can even totaly degenerate.