Produced by Jarred Nettle, who worked with the duo on their debut EP Taste of Me (2021), the album "indicate[s] a sonic diversity previously unheard of by the band.

[7] On 10 August, the band announced the title and track listing of their debut studio album, with the scheduled release date of 13 October.

[3] Produced by Jarred Nettle, The Rot That Grows Inside My Chest marks a sonic departure from their previous work, influenced by the sound of 5 Seconds of Summer and Camp Cope.

[12] Some songs were in the works for years before their debut EP Taste of Me (2021) was released – "Honey (And Other Sweet Things)" and "Superglue" were both written in 2019.

[12] In January 2024, the band released their debut short film, a visual accompaniment for The Rot That Grows Inside My Chest.