"Heart Attack" is the second English (and third overall) single from Enrique Iglesias' tenth studio album, Sex and Love. The song was produced by The Cataracs, who also produced the album's first single "Turn the Night Up", and was written by Iglesias, Niles Dhar, Marty James and Rome Ramirez. The song had its radio premiere on 17 September 2013 and officially impacted Top 40/Mainstream radio in the U.S. on 1 October 2013. It was made available for purchase as a digital download in North America on 8 October 2013,

After reaching moderate success with the song "Finally Found You" and very minor success with "Turn the Night Up", Enrique announced "Heart Attack" as his new single. Enrique premiered the song on 24 September 2013. Speaking to Ryan Seacrest, Iglesias explained the writing process, saying, "I don’t know why we do that. I think both girls and guys, we do that to ourselves. But it's happened to all of us and it's a story we can all relate to … and you think you've learned your lesson and it can happen over and over and over again. The way I look at music and write songs, it's like when you go to the movies, and some songs are more real and some songs are more fantasy."

"Heart Attack" was written by Enrique Iglesias, Niles Hollowell-Dhar, Marty James and Rome Ramirez, with production being handled by The Cataracs, being his second consecutive song written and produced by them. "Heart Attack" is a midtempo dubstep and electropop ballad, with lyrics like, "I thought I never want you back / But I don’t wanna live in a world without you." Lyrically, the song talks about losing someone and it hitting you like a heart attack. In the chorus, he sings, "Yeah-yeah-eh…feeling like a fool-oo-ooh…hit me like a heart attack."

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