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Over 3 million people worldwide have Multiple Sclerosis and the odds are you might know someone yourself.
So this is the story of Patient Zero who put himself through a radical new stem cell treatment, using his own blood, in an attempt to rid himself of MS
The radical treatment involved taking extreme risks but there was the promise of a lifetime free from the disease.
We hear, in his own words, what they did to him and whether it worked.
We also hear from Dr Paulo Murraro of Imperial College London who is a world expert in the causes and treatment of MS
He tells us what he believes causes MS and how the stem cell treatment is supposed to work.