Rare Conditions

Some diseases are incredibly rare, but can also be deadly or severely impact quality of life. They can also be traced to lifestyle, with some of them occurring outside the U.S. With that being said, here are nine of the rarest diseases worldwide.

Some will reach this milestone without the slightest scratch in their health record, while others start to notice different aches and pains. Nonetheless, it's important to be prepared and know what potential health problems may lie ahead.