Gregg Allman is cancelling his remaining summer tour dates, and may be headed to the hospital. According to the Tribune-Democrat in Johnstown, Penn., the singer's weekend show at the AmeriServ Flood City Music Festival in Johnstown was his last show for a while, as he's taking time off to attend to various medical issues. This includes all shows through Sept. 15.

Jambands.com is reporting that treatment for for an upper respiratory condition will involve several days of hospitalization, followed by up to six weeks of bed rest. The Allman Brothers Band singer previously had to cancel several European dates in June to attend to an upper respiratory condition.

Allman has been open about his treatments to battle Hepatitis C, even teaming up with prescription drug company Merck to launch the Tune In to Hep C public awareness campaign. In June he told Spinner that he caught the disease when he was 20. "I was getting my first or second tattoo and that's where I got it, before they passed all the laws where they have to have the needles sealed and everything. He just picks a couple of 'em out of a bucket, stirred 'em in some water or something, and loaded them in the guns! Said, 'Whatchawant, boy? What color?'"

The 64-year-old Allman has yet to release an official statement on the remainder of his summer dates, which include stops throughout the Northeast and Canada. There isn't another stop listed on his website's tour calendar until a New Year's Eve show in Oklahoma.