In an interview with People Magazine, the 48-year-old revealed she was first diagnosed with the disorder in 2001, when she was hospitalised for a physical and mental health breakdown.
"I didn't want to carry around the stigma of a lifelong disease that would define me and potentially end my career," she said. "I was so terrified of losing everything."
"Until recently I lived in denial and isolation and in constant fear someone would expose me," Carey told the magazine. "It was too heavy a burden to carry and I simply couldn't do that anymore. I sought and received treatment, I put positive people around me and I got back to doing what I love - writing songs and making music."