Songfacts®:

• This song finds Ellie Goulding giving voice to her frustrations and screaming it out. She wrote in a Genius annotation: "You just need to lose it sometimes. It's okay to not be okay."
• Goulding told The Sun: "Scream It Out is about trying to justify bad things that happen in the world."
• Goulding said in a video regarding this song that one of her favorite lyrics on Delirium is:
  
  I have always had a thing for silence.
  But lately I just need a voice I recognize.
  It is a perfect time to scream it out
  
  She explained: "It summed up a time in my life where I needed to recognize not being okay and then just communicating it and getting through it. I think it is definitely one of the more anthemic songs on the album."
• Goulding wrote this song with producer Jim Elliot, who has worked with such artists as Kylie Minogue ("All The Lovers"), Will Young ("Jealousy") and Olly Murs ("Dear Darlin'"). He also co-penned with Goulding seven of her Halcyon tracks.
  
  Goulding said of collaborating with Eliot: "Jim is chill. We chat for ages. His studio is in the middle of the countryside, feels very different, a lot more raw. We just use whatever mic is there, pick up a guitar and record it. Pick up another thing and record it. It's less planned and a lot less formulaic. Not necessarily any better or any worse or inexperienced in terms of songwriting, just a very different way of writing songs."