Green Day frontman Billie Joe Armstrong is out of the hospital after canceling a show in Italy on Sunday night due to illness.

According to MSN.com, the East Bay native was admitted to the Hospital Maggiore in Bologna due to a mystery illness, and the band was forced to miss playing the I-Festival in the same city Sunday. No official details about his condition have been released, but local reports said Armstrong was suffering gastric problems and discharged himself from the hospital Monday.

Italian publication La Voce also reports some fans caused problems at the hospital by attempting to visit Armstrong.

The singer's bandmates, Mike Dirnt and Tre Cool, released a video statement to apologize to fans.

"We apologize profusely," Dirnt said. "Billy got rushed to the hospital last night due to illness. The doctors don't think it's a good idea for him to play today."

"We're beyond devastated," Cool added. "We're as sad as you guys are. Billie's extremely upset about it, and we'll see you soon."

Contact Tony Hicks at thicks@bayareanewsgroups .com or on Facebook at www.facebook.com/BayAreaNewsGroup.TonyHicks.