Alison Krauss has been forced to cancel a major festival appearance after being diagnosed with a vocal condition.

Krauss has canceled her scheduled performance at the IBMA World of Bluegrass Festival, which takes place from Sept. 24-27 at Red Hat Amphitheater in Raleigh, N.C. She was slated to perform on Sept. 27 as part of a bluegrass all-star band with Del McCoury, Bela Fleck and other stars of the genre.

But a newly-diagnosed vocal problem will not allow her performance to go forward, according to a statement on her website.

"Alison Krauss was recently diagnosed with a vocal condition called dysphonia. Alison has been advised to have vocal rest, and therefore will not be performing at Wide Open Bluegrass next weekend. We anticipate a smooth, quick recovery given proper treatment and adequate rest."

Dysphonia is a catch-all term for a wide range of conditions that can include vocal paresis, laryngitis, vocal nodes or trauma. Symptoms may include a hoarse or rough voice, dryness of the throat, and the inability to sing in the upper range. Treatments can include an extended period of not talking, consuming extra clear fluids, giving up causative factors like smoking and alcohol, eliminating stress and getting more rest.

Krauss' website currently shows no other upcoming events scheduled.