“What Hurts the Most” is a song written by American songwriter Jeffrey Steele and English songwriter Steve Robson. The song is written by Jeffrey Steele & Steve Robson.
In 2006, country music trio Rascal Flatts released the song as a single from their album Me and My Gang, and it became their fifth number-one single on Billboard’s Hot Country Songs chart. It also peaked at No. 6 on the all-genre Billboard Hot 100, becoming the band’s first Top 10 pop hit. In addition, the song reached number 1 on the Adult Contemporary charts. Rascal Flatts also performed the song live with Kelly Clarkson at the Academy of Country Music Awards in 2006.