Toni Braxton has lived with lupus for 15 years. Here's what to know about the disease.

May is Lupus Awareness Month and Toni Braxton is using the opportunity to speak out about living with this chronic autoimmune disease.

In an interview with CBS News Wednesday, the Grammy-winning singer, producer and actress, who is 55 years old, said she was diagnosed with systemic lupus 15 years ago but had symptoms "even years before that."

"I've had some serious health complications, including now it's starting to affect my kidneys. ... My skin, my hair, my heart, my vital organs are starting to become affected," she said. "I love performing. I love touring, but I know I can't do six to seven shows a week. My body's not gonna let me do that. But I always try to find the silver lining. Maybe I can do two to three shows a week."