"She's a world-class entertainer and needs to be at the top of her game to give her fans the show they expect," Jackson's manager, Kenneth Crear, said in a statement. "She's feeling much better and is ready to hit the road again to finish the tour."
Upcoming stops include Atlanta, Houston, Dallas, New York and East Rutherford, N.J.
Jackson, 42, will announce new dates for concerts she postponed in Montreal; Boston; Philadelphia; Greensboro, N.C.; Fort Lauderdale, Fla.; and Uncasville, Conn.
She is on her first North American tour in seven years.