Mariah Carey has revealed she was diagnosed with bipolar disorder 17 years ago.
In an interview with People magazine, the singer said she was first diagnosed with the condition in 2001 after a mental breakdown which resulted in her being admitted to hospital.
Mariah Carey, who has sold 200 million records worldwide, said she only recently has sought medical treatment.
The singer said it came after “the hardest couple of years I’ve been through”.
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Mariah Carey explained: “Until recently I lived in denial and isolation and in constant fear someone would expose me.
“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.”
Mariah Carey said she is now having therapy and taking medication for bipolar disorder, which has caused her to have periods of depression and hypomania, which can cause irritability and insomnia.
She said: “I’m actually taking medication that seems to be pretty good. It’s not making me feel too tired or sluggish or anything like that. Finding the proper balance is what is most important.”
Mariah Carey added that for a long time she thought she had “severe sleep disorder” but whilst working on her album in the studio released “it wasn’t normal insomnia”.
“I was irritable and in constant fear of letting people down,” she added.
Mariah Carey told People: “I guess my depressive episodes were characterized by having very low energy. I would feel so lonely and sad – even guilty that I wasn’t doing what I needed to be doing for my career.”