Medical terms such as "halitosis" or "adrenal fatigue" sound legit, right? Except, they're not. Yes, there are many made-up medical conditions that don't have the science to back them up. Some date back thousands of years and have stayed in the past, while others are still used to this day.
In this gallery, we delve into the science behind some of history's most popular fake medical conditions. Click on to learn more.