Janet Jackson has delayed three more shows because of an undisclosed illness, the Associated Press reports.

Jackson postponed a scheduled concert on Saturday in Greensboro, NC, as well as one Sunday in Atlanta and a third Tuesday in Fort Lauderdale, her publicist said in an e-mail to the news agency late Saturday.

A statement from the 42-year-old singer said she arrived in Greensboro hoping to perform on Saturday, but a local doctor recommended that she not take the stage after it became "evident" she was not fully recovered, AP said.

A rep said last week that Jackson became "suddenly ill" and was hospitalized Monday night in Montreal shortly before a scheduled show. She also canceled concerts in Boston and Philadelphia on Wednesday and Thursday.

Jackson's publicist did not elaborate on her condition on Saturday, saying only that the singer was still "recuperating."