Lynn was scheduled to perform Saturday at The Paramount Arts Center in Ashland, Ky., but the show was canceled due to the 76-year-old singer's illness, CNN reported.
"Loretta regretfully must cancel her shows for Ashland, Ky., and Durham, N.C., for this weekend, due to illness," the theater's Web site said. "Doctors have diagnosed her at the beginning stages (of) pneumonia, and (she) will continue to need rest. Loretta is doing well and is disappointed, but feels confident she will be ready for upcoming November dates."
Lynn is best known for her hits "Coal Miner's Daughter," "I'm a Honky Tonk Girl" and "You Ain't Woman Enough."
The illness is one of a string of ailments Lynn has battled recently. She had knee-replacement surgery in August and in July she was hospitalized for dehydration and heat exhaustion.