In his book Scar Tissue
, Kiedis explained that he thought up the lyrics while he was driving from a session with the Red Hot Chili Peppers. He was kind of sad because John Frusciante and Flea were getting closer as friends and Anthony was set apart from that, due to the fact that he was deeply involved with drugs. That's why he wrote, "Sometimes I feel like I don't have a partner."
Kiedis also wrote of the song: "Under The Bridge... I started freestyling some poetry in my car and putting the words to a melody and sang all the way down the freeway. When I got home, I got out my notebook and wrote the whole thing down in a song structure, even though it was meant to be a poem to deal with my own anguish."
Tiago - Santos, Brazil