There are times when it feels like a pretty lucky thing to be living in the 21st 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.
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.
More To Explore