"So Sick" is a song by American singer and songwriter Ne-Yo. The track was produced by Norwegian production team Stargate for Ne-Yo's debut studio album In My Own Words (2006). The song was released as the second single from the album.

"So Sick" was successful on charts worldwide, reaching number one in the United States and the United Kingdom. It's also Ne-Yo's biggest hit so far although the single also battled through controversy. It won the race to the UK number-one spot, scoring Ne-Yo his first UK number one and beating "Nature's Law" by Embrace which only reached number two due to a large count of legal download sales of "Nature's Law" which didn't register in the official charts. The song was featured in the video game Saints Row 2.

Ne-Yo met Norwegian production team, Stargate, consisting of Mikkel S. Eriksen and Tor Erik Hermansen, in a hallway at Sony Music Studios on West 54th Street, New York City after the duo had settled there in the spring of 2005. After finding out they produced R&B-oriented tracks, among others, they started on writing songs for his debut studio album In My Own Words (2006). They produced six songs, including "So Sick".

Mikkel S. Eriksen and Tor Erik Hermansen of Stargate composed the music for the song, while Ne-Yo wrote the song's lyrics. "So Sick" centers on a character, who is tired of hearing love songs playing on the radio, as they remind him of his last relationship and breakup.

Ne-Yo has said he got the idea for the song from an old girlfriend he used to have. Ne-Yo told Billboard, "It's about the first time I fell in love with a girl in a way that I completely screwed it up. So it was a story that I didn't have to think really hard about putting it together. A lot of heartbreak went into that song, so that's why I think a lot of people dug it the way they did – because you can feel it."

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