Country music legend Charlie Louvin is battling stage 2 pancreatic cancer. The Country Music Hall of Famer, who celebrates his 83rd birthday today (July 7), heard the diagnosis after seeing a doctor about what he says was just a minor complaint.

According to a statement on his official website, Charlie will go in for a six hour surgery at Vanderbilt University Medical Center in Nashville on July 22. During what is called a Whipple procedure, doctors will remove part of his pancreas, small intestine and bile duct and will then reconstruct his digestive tract. The singer will likely be in the hospital for two weeks.