New research suggests the number of children suffering from multiple sclerosis may be higher than previously thought.
It remains a very rare condition and only a third of young people who have an attack will go on to develop MS in later life.
But it can have a devastating affect on children and their families.
One of those is 15-year-old Emily Murdoch from Cannock in Staffordshire.
Like many girls her age, she loves horses and has been riding since she was a little girl.
One day she hopes to represent Britain in competition, but she does not know if it will be in the Olympics or Paralympics.
At the age of 12, Emily was diagnosed with childhood multiple sclerosis. An attack can leave her confined to a wheelchair when her legs stop working.
She suffers from severe tiredness, muscle spasms and numb hands and legs.
"It's not really very nice," she says "especially when my legs go on me, because it's the second time my legs have gone on me."
"It took my left hand last time.
"My legs get weaker. I know when my MS is bad because my legs get weak and my horse can feel it."... Read More - http://www.msrc.co.uk/index.cfm/fuseact ... ageid/1408