Natalie Cole Diagnosed With Hepatitis C

Natalie Cole, a Grammy-winning singer, has been diagnosed with Hepatitis C, her rep confirms to People.com. Cole, 58, discovered she had the disease during a visit to the doctor, but is responding well to treatment. Cole has suffered side effects from the anti-viral medicine, including fatigue, muscle aches and dehydration.

"Natalie has had a terrific response to her medication and is now virus negative," Dr. Graham Woolf, at U.C.L.A./Cedars-Sinai Medical Center, said in a statement.

Doctors believe that Cole's illness is likely the result of drug usage decades ago. Cole was addicted to LSD, cocaine and heroin before becoming clean of drugs in 1984 following a long stay in rehab.