"Based on Rihanna's examination, after Grammy rehearsal today, Rihanna's doctor put her on vocal rest for 48 hours because she was at risk of hemorrhaging her vocal cords," a spokesperson for the singer said in a statement. "The antibiotics she has been on for three days did not kill the infection adequately, therefore she cannot perform safely."
Rihanna apologized on Twitter after the show, tweeting, "#NAVY so sorry I couldn't be there ..... Thanks Grammys and CBS for your support tonight."
At the 2015 ceremony, Rihanna performed trap-folk single "FourFiveSeconds" alongside Kanye West and Paul McCartney. She also took home her eighth Grammy award last year for her single with Eminem, "The Monster," which won Best Rap/Sung Collaboration.
Along with her McCartney and West collaboration, Rihanna released two more singles in 2015: "Bitch Better Have My Money" and "American Oxygen." All three of her releases from last year were scrapped from her long-awaited eighth LP, which was finally released in January.
The dancehall-inspired "Work," featuring Drake, is her first single off the psychedelic album. This month, she'll begin her Anti world tour with special guests the Weeknd and Travis Scott, who both received writing credits on the album.