"Heart Attack" is a song by American singer Demi Lovato. The song was released on February 24, 2013, as the lead single from her fourth studio album, Demi (2013). The song was produced by Mitch Allan and Jason Evigan of "The Suspex", who co-wrote the song along with Lovato, Sean Douglas, Nikki Williams, and Aaron Phillips. "Heart Attack" is an electropop song that employs cardiac motifs to represent the fear of falling in love. Music critics mostly complimented the lyrical content and Lovato's vocal range.

The song sold 215,000 copies in the U.S in its first week her best sales week for a song download, and peaked at number 10 on the U.S. Billboard Hot 100, becoming Lovato's second solo top-ten single in the country. It was later certified double platinum by the Recording Industry Association of America (RIAA), having sold over two million copies in the United States. "Heart Attack" performed well internationally attaining certifications in countries, including Canada, Denmark, Sweden, and the United Kingdom.

An accompanying music video for "Heart Attack" was directed by Chris Applebaum, and was premiered through Vevo on April 9, 2013. Lovato has performed the track on several television programs, and has also included the song on the set list of her headlining The Neon Lights Tour (2014).

"Heart Attack" was produced by Mitch Allan and Jason Evigan of "The Suspex", who co-wrote the song along with Lovato, Sean Douglas, Nikki Williams, and Aaron Phillips. Nikki Williams said the song was written two years prior to its release. She explained: "At the time I was going through some relationship stuff, and I was just so depressed, so when I got into the session I thought, 'You know what? I'm gonna pour it all out there, and get it off my chest'". The song was first intended for Williams, but her record label rejected it.Pia Toscano then recorded the song in 2011 intending it for her debut album with Interscope, but it did not materialize. When Lovato heard the song, she recorded it before altering a few lyrics. The first version also contained a dubstep break, which was removed for Lovato.

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