On stage, Nick, Kevin, and Joe Jonas are stars, selling out the biggest arenas in the world.
Millions of fans, and millions of dollars are coming their way.
But every day, Nick, the youngest member of the band, is reminded he is just like 150-thousand other American kids -
He has Type One diabetes.
Nick recalls, "I started to see some weight loss, I was using the restroom a lot. All the symptoms of diabetes, but at the time, I had no clue."
When Nick finally went to the hospital, his blood sugar level was over 700 - nearly 10 times what it should be.
He spent 3 days in the hospital, and got a crash course in how to live with diabetes.
Nick says, "I'm diabetic, guys. C'mon."
While he jokes about it now, and uses it as an excuse to get out of trouble with his equally famous brothers, Nick says at first it was scary.
Now, he wants to use his own experience to help other kids with diabetes.
So, with his parents by his side, he held a news conference.
He's also joined forces with a company that makes diabetes medications and test meters.
He's even written a song about his ordeal.
Nick says, "It was one of those days, when my blood sugar was kind of high, and I was feeling kind of bad. I sat down at the piano, and wrote the song in about 20 minutes."
With the song, and his public appearances, Nick wants to let other kids know they're not alone.
His best advice - reach out to your family for help.
Brother Kevin Jonas says, "When we first found out, it was very very scary. We didn't know what was going to happen."
Brother Joe Jonas adds, "Brother. I'm happy he's OK, and he's still with the band, 'cause at every meet and greet, thousands of kids come through, thanking Nick for being such a positive light."
Nick Jonas also has a website called 'Nicks Simple Wins.' It aims to help young people with diabetes, and their families.... make little day-to-day changes that can lead to *big improvements in their health.
