PHOTO: From left; Mariah Carey, Carrie Fisher and Pete Wentz are celebrities who are battling bipolar disorder.
VIDEO: Mariah Carey's announcement puts new spotlight on bipolar II disorder
PHOTO: Mariah Carey revealed she was diagnosed with bipolar II disorder in a new interview with People magazine.
This cover image released by Dey Street shows "Notes on a Banana: A Memoir of Food, Love and Manic Depression," by David Leite.
VIDEO: Ricki Lake opens up on her ex-husband's battle with bipolar disorder
Dec. 21, 2000: Carrie Fisher reflects on her life dealing with manic depression.
ARCHIVAL VIDEO: Patty Duke Seeks to Promote Understanding of Manic Depression in 1989