"Blood in the Cut" was written by K.Flay, JT Daly, and Lena Kwan Simon and produced by Daly. The lyrics of the song describe a breakup and its violent effects. K.Flay further described the background of the song in an interview with IHeartRadio:[4]
"Blood in the Cut" started as a breakup anthem. I wrote the lyrics and the riff in 20 minutes, and I was actually at home for Christmas, so I was in my parents' basement doing that. I was in a somewhat dark emotional place. I wrote that, and I immediately felt filled with this vigor that I had previously been missing. And then producing the song, just embracing that spirit of release in the chorus.
— K.Flay
Music video
The music video for "Blood in the Cut" premiered on September 7, 2016 and was directed by TJ Andrade.[5] The video begins with K.Flay walking from an overturned car unscathed into a diner bathroom. As the chorus comes in, she has a breakdown. She then walks out past a gas station and levitates into the air at the end of a dark street.