R. Kelly was forced to skip three appearances in NYC Wednesday because of a "health emergency that has sidelined Mr. Kelly in Chicago," a rep for the singer said.
"Initial indications are that he is suffering from complications from surgery he had last year to treat an abscess on his vocal cords," the rep said.
No further details were available.
The singer was slated to be in New York to promote his new memoir, "Soulacoaster: The Diary of Me," and had to cancel appearances on NBC's "Today" show and "The Jimmy Fallon Show," as well as a book party being held in his honor.
It is unknown how long R. Kelly will be out of commission.