Dr. David Farcy told entertainment news website TMZ.com the singer best known for her hits "R.I.P." and "How We Do (Party)," is fine.
TMZ said the 22-year-old singer was having photos taken for Madonna's Material Girl campaign when she got sick. She was taken to a hospital by ambulance.
Ora, who also has dabbled in acting, smiled widely upon returning to her hotel following her release, TMZ said.