About 15% of people have tinnitus, at least in the United States. It's one of the most common medical conditions in the country, but most people don't think about how to accommodate it. Many people who have it don't even notice it unless they're in total silence, which adds a particular challenge to float centers. 

Graham and Ashkahn talk about their experiences in floating people with tinnitus and how to approach the situation when and if a float becomes problematic.