The 20-year-old singer is set to undergo the operation to remove the tissue from her throat later this year in the midst of promoting her new album `Demi` and ahead of the next series of `The X Factor` USA and she admits her hectic schedule and surgery could stop her from touring.
Speaking in a `Live From MTV` interview, Demi said: "Actually, thissummer I have to get my tonsils out ... I`m not sure if this year is the best opportunity to [tour] because `X Factor` keeps me so busy."
In a bid to be brave, Demi aims to go under the knife without any anaesthetic, but isn`t sure whether her plan will pan out as she hopes.
She quipped: "I`m gonna do it without painkillers, though, `cause I`m a boss. I say that now!"
Despite putting on a tough exterior for her upcoming surgery, Demi admitted it was an entirely different case while recording her new record and even found herself "sobbing" while recording ballad `Shouldn`t Come Back` as it was so emotionally liberating to pour her heart out through lyrics.
She recalled: "I was just sobbing because it was just built-up emotion that I was finally getting to release in music. And there was a turning point in the song originally about one thing and then ... I was like, `I want to try something new,` and I kind of... freestyled the lyrics.
"And I just changed the song completely, and my producers in the studio were like, `Whoa, it just got heavy.` "
Demi - who entered rehab in 2010 to be treated for an eating disorder, self-harming and bipolar disorder - is anxious about how she will perform emotional songs such as `Shouldn`t Come Back` and `Warrior` live.
She added: "With those songs, I don`t know if I will perform them on stage. To be in front of an audience and be that vulnerable, I don`t know if I can do it ... But I may have to and I may have to get over it and realise that I let the world in on this certain topic and here we go."