Health | Diseases & Conditions | Rare Diseases

Rare diseases may not be common, but they are no less painful or difficult than conditions you've heard of. Learn about the causes and symptoms of rare diseases as well as how patients can find treatments for their unusual conditions.

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What are the world's rarest diseases?

What if you were the only person in the world with a disease, and scientists used your name to classify it? How would doctors know what was wrong?


What are the world's rarest diseases?

What are the world's rarest diseases?

The world's rarest diseases may affect few people or may exist solely in a lab. Learn about the world's rarest diseases and what makes a disease rare. See more »

12 Deadly Diseases Cured in the 20th Century

12 Deadly Diseases Cured in the 20th Century

Diseases like polio and smallpox took countless lives before a cure was found. Read our list of 12 diseases that were cured in the 20th century. See more »