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20 of the rarest diseases in the world

Espresso Logo By Judith Lussier of Espresso | Slide 1 of 21: A rare disease is defined as a medical condition that affects between one in 2,000 and one in 200,000 people. According to Orphanet, there are between six and seven thousand rare diseases that have currently been identified. Here are 20 that you might not have heard of.  

20 of the rarest diseases in the world

A rare disease is defined as a medical condition that affects between one in 2,000 and one in 200,000 people. According to Orphanet, there are between six and seven thousand rare diseases that have currently been identified. Here are 20 that you might not have heard of.  

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