In the musician's latest album Hurts 2B Human, Pink sings about feeling insecure about her body in guitar ballad "Happy".
The song begins with the line: "Since I was 17, I've always hated my body, and it feels like my body's hated me."
Pink has explained that this lyric is in reference to the miscarriage she experienced at that age, which had a negative impact on her body image.
"The reason I said [that] is because I've always had this very tomboy, very strong gymnast body, but actually at 17 I had a miscarriage," the 39-year-old told USA Today on Monday.
"And I was going to have that child. But when that happens to a woman or a young girl, you feel like your body hates you and like your body is broken, and it's not doing what it's supposed to do."
According the baby's charity Tommy's, approximately one in four women will experience a miscarriage in their lifetime.
The singer added that having had several miscarriages since, she believes it's "important to talk about what you're ashamed of" and "who you really are".
Five years after experiencing her first miscarriage, the singer decided to visit a therapist.
While Pink admitted that therapy can be "uncomfortable and painful", she said she believes in the importance of "self-confrontation and just getting things out".
"I think the reason I can go to such uncomfortable places and be so honest is because I have a really healthy sense of humour," the Grammy Award-winner added.
Pink has two children with her husband, professional motocross racer Carey Hart.
The singer recently stated that she will no longer share pictures of her children on social media, following the criticism she received from "disgusting" trolls over a photograph of her son.
“I’m prouder of my kids than anything I’ve ever done and I just won’t share them anymore. I won’t do it," she said on The Ellen DeGeneres Show.
“I understand people saying, ‘You need to be more careful, you are in the public eye, you should have thought of that.’
If you've suffered a miscarriage and would like to speak to someone for support, you can call Tommy's pregnancy helpline at 0800 0147 800. The phone line is open from 9am until 5pm, Monday to Friday.