"Unwell" is a song by American alternative rock group Matchbox Twenty. Released on February 3, 2003, as the second single from their third album, More Than You Think You Are (2002), it was written by Matchbox Twenty lead singer Rob Thomas. "Unwell" spent 18 weeks atop the US Billboard Adult Top 40 chart and two weeks atop the Billboard Hot Adult Contemporary Tracks chart. It also reached No. 5 on the Billboard Hot 100, becoming their third and final top-10 hit. Internationally, the single became a top-20 hit in Australia, peaking at No. 12, and a top-10 hit in New Zealand, peaking at No. 8. "Unwell" was nominated for a Grammy Award in 2004 for Best Pop Performance by a Duo or Group with Vocal.