Let's say you have a collection of baffling physical symptoms. You know something is very wrong with your body, but no one seems to be able to figure it out. Welcome to the doctor's visit of someone with a medical condition you've never even heard of. See more »

These unusual medical conditions range from body mutations to bodily feats. Take a look at five unusual medical condition videos to see more. See more »

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? See more »

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. See more »

There are many diseases out there you've never heard of. We've put together the top 20 diseases you've probably never heard of that are rare and unusual. See more »

Some medical conditions are so bizarre it's hard to believe they're not made up. See if you can answer the questions below about some bizarre medical conditions that seem almost too bad to be true. See more »

It's a noble and difficult endeavor to eradicate diseases. Yet, a number of organizations and a host of people are dedicating their lives to just that and in turn, millions of lives are being saved. See if you know which diseases may one day be eradicated. See more »

They were peculiar, and sometimes horrifying, but what was really wrong with them? Test your knowledge of some famous circus "freaks" in this seven-question quiz. See more »

Neurofibromatosis is a genetic disorder that causes tumors to form on nerves throughout the body. Learn more about neurofibromatosis here. See more »

In 1998, a panel of doctors at the National Institutes of Health surmised that Joseph Merrick's affliction may have been caused by a condition known as Proteus syndrome. Find out what it is and what causes it. See more »