"Aneurysm" was first recorded in the studio on January 1, 1991, by Craig Montgomery at the Music Source in Seattle, Washington. This version was first released as a B-side on the "Smells Like Teen Spirit" single later in the year. It was re-released on the 1992 tour EP Hormoaning which was only released in Australia and Japan. This version of Aneurysm was also released on the rarities box set, With the Lights Out in 2004. It was again released on the 20th anniversary "Deluxe" reissue of the Nevermind album in 2011.
A second studio version was recorded on November 9, 1991 for the BBC radio program, Mark Goodier's Evening Session. It appears on the band's 1992 rarities compilation album, Incesticide, and features a faster tempo, and a wider stereo effect.
A live version, recorded on October 31, 1991 at the Paramount Theatre in Seattle, Washington, appears on the DVD and Blu-ray release Live at the Paramount, released in 2011. The show is also included on CD4 and the DVD that comes with the "Super Deluxe" version of the Nevermind album reissue, released in 2011.