16 Celebrities with Chronic Illnesses

Mariah Carey

Bipolar disorder

Bipolar disorder is characterized by sharp mood swings. "Until recently I lived in denial and isolation and in constant fear someone would expose me," she told PEOPLE in April 2018. "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."