Representatives for the singer said she fell suddenly ill in the Canadian city Monday night shortly after she arrived for her scheduled show.
Jackson was hospitalized and canceled her Wednesday show in Boston and Thursday show in Philadelphia.
Jackson's publicist said additional shows had to be canceled after arriving in Greensboro, North Carolina when a local doctor advised her she was not fully recovered.
The two additional dates that were canceled are Atlanta, Georgia and Fort Lauderdale, Florida.
Fans are asked to hold on to their tickets as the promoters are working on rescheduling the dates. Jackson has returned home for further treatment.
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