Many fans were disappointed as AC/DC postponed several dates on their current world tour. The band’s "Black Ice" world tour was scheduled to begin on Thursday (October 1) in Phoenix, Arizona. Some rumors floating around speculated that the front singer was having throat problems but on Wednesday an update was posted on the official AC/DC website to inform fans what is going on.

Here is what Brian Johnson had to say: "It's an inside job that forced me to reschedule those upcoming 6 shows! Inside being the operative word here. My insides were giving me lots of trouble, ulcers and such. They were really uncomfortable and painful, which required me to seek immediate medical attention.

"The doctor's looked me over, poked, scanned and prodded all possible areas. In the end they gave me a clean bill of health, but insisted that I take a bit of time to recuperate and rest up. We've been touring non stop since this time last year and have a lot more touring to do. Thanks for all of the get well wishes and I hope to see you all again very soon."

To see the Aussie vet-rockers perform live is a spectacle. So don’t miss their next concerts. AC/DC's tour will pick up October 16 in Washington.

Besides the first AC/DC concert in Phoenix, five more concerts, in Las Vegas, Louisville, Kansas City, Des Moines and Milwaukee, were also postponed and will be rescheduled. The band is still scheduled to hit South America later this year and arrive in Australia and New Zealand in early 2010.

AC/DC has been on the road in support of "Black Ice", its first studio album in eight years. The album has sold more than two million copies in the U.S. since its release as a Wal-Mart exclusive.

AC/DC will release a limited-edition box set called "Backtracks" on November 10. As previously speculated, the "deluxe" package is housed inside a fully operational AC/DC amplifier and will come in a limited, autographed run of 50,000 copies.

A standard edition will feature two CDs of live and studio material, a single DVD plus bonus videos.