[1] The band is named after Phineas Gage, an 1840s railway foreman, who had a large iron rod driven through his head and thereby lost part of his brain.

They played over 500 shows in their existence, touring with many bands including Streetlight Manifesto, Spunge, Whitmore, Flood Of Red, Reuben, RedLightsFlash, Ten Foot Pole, Farse, and 4Ft Fingers.

They released debut mini LP More Haste More Speed in 2003 on Deck Cheese Records – and their first full length, The Feeling Somethings Wrong on the same label in 2005.

Signing to Fond of Life Records in Germany, the band released a compilation of old and new tracks in 2006 entitled Brighton Rock, which included the band's only single, Brighton Rock, the video for which received airplay on MTV2 and Scuzz.

Phinius Gage plays fast, melodic hardcore music in the style of Pennywise, Strung Out, Consumed, Rise Against, and other bands of the SoCal description from record labels including Fat Wreck Chords and Epitaph.