The album was produced by Jonny Coffer, D. Sardy, Jesse Shatkin, and longtime collaborator Butch Walker, as well as self-production from the band.

The album was preceded by five singles; "Young and Menace", "Champion", "The Last of the Real Ones", "Hold Me Tight or Don't", and "Wilson (Expensive Mistakes)".

Upon the album release, Mania received largely mixed reviews from music critics, but fared well commercially, debuting at number-one on the US Billboard 200.

Fall Out Boy enjoyed commercial success and worldwide acclaim after releasing their sixth studio album, American Beauty/American Psycho (2015).

The beginning of the production process for Mania began after the band's frontman Patrick Stump introduced the song "Young and Menace" to bass guitarist Pete Wentz at Reading and Leeds Festival in 2016, which inspired the musicians to record a full-length.

The tour, which took place in both North America, Australia and New Zealand, featured support from blackbear,[10] Jaden Smith,[11] and Waax.

[13] To promote their upcoming headlining gig at Wrigley Field, Mania, and their then-just-released EP, Lake Effect Kid, the band held a pop-up event in Chicago, IL titled "The M A  N   I    A Experience".

This room was unique as it had headphones for fans to listen to unreleased tracks and remixes, including one version of a song sang by Rivers Cuomo of Weezer.

The room also featured warped mirrors on the wall, as well as spinning faceless ballerinas and a broken music box with the lyrics "One look from you and I'm on that faded love out of my body, and I'm flying up above."

The washroom in the facility was also FOB-themed and had posters for their album as well as strands of yarn on the mirrors for fans to take a picture with, a homage to the artwork for their EP Lake Effect Kid.

There was also a room in which Pete Wentz, as well as Andy Hurley, would be in a box writing with headphones on with a sign that read: "Don't Tap on The Glass," which is a reference to their song "Sunshine Riptide."

[18][19][20] The fourth single, "Hold Me Tight or Don't", was released on November 15 with its music video, which takes a notable influence from the Mexican holiday Day Of The Dead.

During recording sessions for Mania, the band scrapped three unfinished tracks; "Past Life", "Wrong Side of Paradise", and "Footprints in the Snow".

The tracks were released by Fall Out Boy, under the alias Frosty & The Nightmare Making Machines, in the form of an extended play (EP), entitled Llamania, on February 23, 2018, through physical CD.

"[39] In his memoir "None of this Rocks", Guitarist Joe Trohman revealed he wanted little to do with the album and regrets it, stating "I'd say, 'I'm gonna extricate myself from this.