Singer-songwriter Bobby Womack has been diagnosed with Alzehiemer's disease.

The 68-year-old Cleveland native, who has been releasing music since the 1960s, revealed in a recent interview how the disease is beginning to impact him. "How can I not remember songs that I wrote? That's frustrating," Womack laments to BBC News.

According to his doctor, the 'Understanding' creator's Alziehemer's is in its early stages. Unfortunately, the disease will worsen as he gets older, his doctor says. Womack has already been in and out of the hospital in recent years after undergoing surgery for prostate and colon cancer. He also suffered from pneumonia twice and was recovering from two collapsed lungs.

Despite his conditions, in June 2012, he made a return to music releasing his album 'The Bravest Man in the Universe,' which was featured on Rolling Stone's list of the top 50 albums of 2012. This was his first album in 10 years. In 2000, he released 'A Christmas Album,' and the year prior in 1999, two albums: 'Traditions' and 'Back to My Roots.'

Womack reached his career peaks in the 1970s, when he charted two No. 1 R&B singles in the U.S.: 'Woman's Gotta Have It' in 1972, and 'Lookin' for Love' in 1974. He was also inducted in the Rock n' Roll Hall of Fame for his contributions to music in 2009.

Watch Bobby Womack's 'Please Forgive My Heart' Video