Sickness may refer to:
- Disease
- Nausea
- Sickness behavior
Other uses
- The Sickness, 2000 album by Disturbed
- The Sickness (novel), 1999 book in the Animorphs series
- Corey Taylor, nicknamed "The Sickness", American heavy metal musician
- (sic)nesses, 2010 video album by Slipknot
See also
- Sick (disambiguation)
- Sicko (disambiguation)