Womack, 68, told the BBC that he began having difficulty remembering his songs and the names of people he's worked with.
The Rock and Roll Hall of Fame member has cut a wide path through the music business as a performer and songwriter in his 50-year career. He recently launched another act with "The Bravest Man in the Universe," the Damon Albarn-produced comeback album that recently made several best-of lists.
Womack has also been fighting cancer and other maladies.
The Associated Press contributed to this report.
