The soul legend admitted he cannot remember some of his songs and the full names of his collaborators.
Womack told NME: "The doctor says there are signs of Alzheimer's. It's not bad yet but will get worse."
He added: "How can I not remember songs I wrote? It's frustrating. I don't feel together yet. Negative things come in my mind and it's hard for me to remember sometimes."
Womack beat colon cancer in May and released his most recent album The Bravest Man in the Universe in 2012.
His album was co-produced by Blur's Damon Albarn, and in an awards ceremony in September Womack called Albarn 'Damon Osbourne' in his acceptance speech.
He added: "The most embarrassing thing is I'll be ready to announce Damon and can't remember his last name."
The singer said that he's already working on a follow-up to The Bravest Man in the Universe, which will be called The Best Is Yet to Come.
Womack recently announced that he would love to record a full album with Lana Del Rey after they collaborated on song 'Dayglo Reflection'.
Watch Bobby Womack perform 'Dayglo Reflection' below: