Bobby Womack has revealed that he is suffering from Alzheimer's disease.

The soul singer admitted that he cannot remember some of the songs he has written 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.

The singer said he is already working on the follow-up to The Bravest Man in the Universe, which will be called The Best Is Yet to Come.