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 »

When you're aboard a ship, you become accustomed to the feeling of the floor tilting and rocking beneath your feet. But what if that sensation stayed with you on dry land -- for years? See more »

When we think of common worldwide diseases, we may think of conditions like HIV or diabetes. But there are many diseases that are actually more common than these that get very little attention. What are they, and why does this happen? 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 »

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 »

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Cystic fibrosis and sickle cell anemia are both autosomal recessive genetic disorders. Learn more about how cystic fibrosis and sickle cell anemia are related from this article. See more »

Cerebral edema is a condition where the brain's water content increases, causing the pressure inside the skull to rise. Learn more about cerebral edema from this article. See more »