"Why Does My Heart Feel So Bad?" is a song by American electronica musician Moby. It was released on October 11, 1999, as the fourth single from his fifth studio album Play. It became a hit in several regions, including German-speaking Europe and the United Kingdom.
"Why Does My Heart Feel So Bad?" was originally written by Moby in 1992 in an iteration which Moby would describe as "really bad techno... Just mediocre, generic techno." Years later, Moby revisited the song, reproducing it as a considerably slower and more "mournful and romantic" song, which he eventually included on his fifth studio album, Play after being encouraged to do so by his manager, Eric Härle. The track is based on the samples from The Banks Brothers' "He'll Roll Your Burdens Away" (1963).