Kings of Leon lead singer Caleb Followill is being urged by his bandmates to go to rehab for alcohol problems.
The band cancelled their tour yesterday, saying that Followill was "suffering from vocal issues and exhaustions".
An insider told US Weekly: "They are trying to get Caleb to go to rehab. It is mostly for alcohol.
"[That's why] they ended up cancelling the whole tour. He drinks like a fish."
Followill stormed off stage in the middle of a gig in Dallas, Texas, last Friday night.
He told fans: "I'm gonna go backstage and I'm gonna vomit, I'm gonna drink a beer."
Another source told US Weekly: "Caleb's drinking is out of control and they are trying to get him into rehab.
"It's a dark demon he has been fighting for awhile."
But a representation for Kings of Leon has denied that Followill has a drinking problem, saying that he is just in need of rest.
"The reason for the cancellation of the tour is Caleb is under doctor's orders for vocal rest.
"They feel terrible about cancelling. They look forward to getting back on the road at the end of September."