Whitney Houston's troubled comeback has been dealt another blow after the singer was forced to cancel more dates on her European tour on doctor's orders.

The US singer was believed to be in a private hospital today in Paris being treated for nose and throat problems.

Her record label confirmed the 46-year-old was unable to make her two gigs in Manchester on April 8 and April 9, plus her Glasgow concert on April 11.

It comes on top of her postponing her Paris concert yesterday (Tuesday), delaying the European leg of a world tour that received a rocky reception in Asia and Australia.

RCA Label Group, part of Sony Music Entertainment, said in a statement: "Doctors visited Whitney late last night in Paris and confirmed that she was suffering from an upper respiratory infection."

"Upon medical advice Whitney has been advised that she cannot perform to allow her time to recover." French media reported on Wednesday that she had been admitted to hospital suffering from throat and respiratory system infections.

The American Hospital in Paris, a private hospital, which treats many prominent individuals, said it could not comment on any patient issues.

Her Manchester gigs have been rescheduled for June 16 and 17 while her Glasgow show is now planned for May 1.

According to Sony, Houston is next set to perform on April 13 in Birmingham, England.