Mariah Carey reveals she has bipolar disorder

In this week’s PEOPLE cover story, Mariah Carey reveals for the first time her battle with bipolar disorder.

Although she was first diagnosed in 2001 (when she was hospitalized for a physical and mental breakdown), “I didn’t want to believe it,” the superstar singer-songwriter tells PEOPLE editor in chief Jess Cagle.

Carey says she finally sought treatment recently after “the hardest couple of years I’ve been through” — years of professional upheaval, an E! reality show and romantic drama.

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