According to The Marfan Foundation's website, "Marfan syndrome is a genetic disorder that affects the body's connective tissue. Connective tissue holds all the body's cells, organs and tissue together. It also plays an important role in helping the body grow and develop properly.

The band was forced to cancel the final dates of their Full Circle Tour after Carlile was hospitalized. In a series of tweets he updated fans on his condition. He tweeted, "Thank you for the get-well wishes, everyone. I'm transferring to Stanford University this week to be in care of my cardiologists and marfans specialists until my health situation at hand is under control.

"It has been a long past few days, and the ones following will be just as much of a struggle, but I can do this. And I believe that wholeheartedly. If I believe in it, so should you. I'm sorry to anyone who missed the last two shows of our tour. I would have much rather been there than a hospital bed, I assure you. Love to everyone, band, family, you. I'm never giving up. Thanks for being there for me. Waking up over and over in the middle of the night, or the nurses helping me pee, reading the tweets help.

He also posted an Instgram selfie photo from the hospital with the following caption, "I've seen better days, but I've also seen worse. Much worse. // And I can't forget the fact there's always someone out there who has seen even worse than I have. // Grateful to at least be alive and to have the chance to start kicking. Thank you for all your well wishes and concern, it'll be a long road ahead, but I can make it through. I always have. Anyone going through anything... They can do it. You can do it. You just have to keep going. Never quit.... // ...and never underestimate the power of the human mind and heart (your mind and heart)... Our achievements and accomplishments as a human race ARENT trophies on a shelf or the towering buildings outside your window... They are much closer... they are right there... Inside of you."