Live Nation says the Grammy-winning singer is unable to perform at Monday's concert in Houston "as a result of illness." The concert promoter says fans should retain their tickets to use at a rescheduled show.
Rihanna canceled shows in Baltimore and Boston on her "Diamonds World Tour" last month because she was sick.
The next date on the singer's tour is Tuesday in Dallas. She's supporting her seventh album, "Unapologetic," which features the hits "Diamonds" and "Stay."
Rapper A$AP Rocky is the opening act on Rihanna's tour.