The Grand Ole Opry and Country Music Hall of Fame member had just celebrated his 94th birthday on Dec. 19. Dickens' wife, family and the Opry are requesting prayers.

Dickens' latest performance was at the Opry on Dec. 20 as part of his birthday celebration. He became a member of the Opry in 1948 and the Country Music Hall of Fame in 1983, well known for hits which include 'Take an Old Cold 'Tater (and Wait)," 'Country Boy" and 'May the Bird of Paradise Fly Up Your Nose."

According to CMT, Dickens had brain surgery in 2009 after he was diagnosed with a subdural hematoma, which is a clot where blood accumulates between the brain and its protective covering. In 2013, he underwent radiation treatment on his vocal cords.