Songfacts®:

• "Lost" is a raw and introspective emo anthem where frontman Oli Sykes lays bare the contents of his troubled mind. The track kicks off with Sykes delving into his battle with drug addiction, specifically recalling his struggles with ketamine.
  
  Watching Evangelion with a big fat slug of ketamine
  I lost the plot a little while ago
  
  Back in 2014, Sykes made headlines when he revealed his addiction to ketamine after experiencing a personal crisis that led to his hospitalization. Here, he reflects on a moment where he indulged in the drug while watching the Japanese animated sci-fi action film Evangelion.
• Tragedy struck again when Sykes' beloved dog Oskar passed away on April 26, 2021.
  
  My dog just died, my friends hate me
  
  Sykes' bond with Oskar was stronger than his friendships, leading him to believe that his friends now harbor animosity towards him.
• As the song progresses, Sykes shares his disillusionment with therapy.
  
  I used to go to therapy, but the doctor tried to section me
  The next time that I open up to someone will be my autopsy
  
  Sykes alludes to a situation where he felt betrayed by a therapist who violated his trust by attempting to have him involuntarily committed for psychiatric evaluation.
• On the song's chorus, Sykes wonders if his medication is working because it doesn't see to be having an impact.
  
  Why am I this way?
  Stupid medicine, not doin' anything
  
  Sykes has been known to critique pharmaceutical solutions for mental illness. The American Medical Association advises against discontinuing prescribed medication without consulting your healthcare provider.
• Bring Me The Horizon released "Lost" on May 4, 2023, marking the band's return to the music scene after their previous singles, 2021's "DiE4u" and 2022's "Strangers." Sykes told BBC Radio 1's Future Sounds with Clara Amfo that "Lost" is "a complete personal load like, not embarrassing, but it's like a therapy session myself."
  
  He added that his singing teacher even questioned if certain lines in the song were real. Despite the vulnerability of the lyrics, Sykes was excited for the song's release, saying it's exhilarating to share such personal material with the world.
• Sykes wrote "Lost" with his Bring Me The Horizon bandmates Matt Kean, Lee Malia, Matt Nicholls and Jordan Fish.
  
  Zakk Cervini and Evil Twin produced the song. The pair also hooked up with Bring Me The Horizon on "Strangers" and their collaboration with Sigrid, "Bad Life."
• Originally named "Gerard Way," this emo-infused track draws inspiration from the punk antics of My Chemical Romance, a clear nod to the genre's roots. It's a natural evolution from Bring Me The Horizon's anthemic sound showcased in their previous release, "Strangers."
  
  "Usually on the singles we're looking for something that'll help people who don't necessarily like our band – or know our band – engage with it," keyboardist Jordan Fish told Kerrang! "That's part of the reason, I know it's not a particularly artistic one, but catchy songs end up being singles. Compared to 'DiE4u' and 'Strangers,' it's very emo-y feeling."
• "Lost" comes with an intense music video helmed by director Jensen Noen. Set in Los Angeles, the cinematic video takes inspiration from the realm of medical horror, delivering a shockingly gory experience. Sykes takes center stage, accompanied by a special appearance from actor Thomas Ian Nicholas, known for his role as Kevin in American Pie. The video fully embraces the theme of Sykes' chorus refrain, creating a visually striking and thematically aligned audio-visual journey.