Selena Gomez details struggles with bipolar disorder and psychosis in her 20s: "It started to get really dark"

Selena Gomez has been open about her physical and mental health journeys. And this week, she's opening up more than ever before, with a deep interview with Rolling Stone and the release of her new Apple TV+ documentary "Selena Gomez: My Mind and Me."

Ahead of Friday's release of her documentary, Rolling Stone published an interview with Gomez in which she details her mental health struggles in her 20s before she was diagnosed with bipolar disorder, which causes "dramatic shifts" in a person's mood, energy and thought processing, according to the National Alliance on Mental Illness.

"People with bipolar experience high and low moods—known as mania and depression—which differ from the typical ups-and-downs most people experience," the organization says.