The 45-year-old singer was due to launch a book on 27.06.12 in New York and appear on the `Today` show and the `Jimmy Fallon Show` but has pulled out after suffering from problems relating to surgery he had on his vocal chords last year.
A representative for R. Kelly told TMZ.com: "The book launch is postponed due to a health emergency that has sidelined Mr. Kelly in Chicago. We sincerely apologise for any inconvenience this has caused.
"Initial indications are that he is suffering from complications from surgery he had last year to treat an abscess on his vocal chords. It is unclear how long Kelly may be sidelined."
In addition to his health issues, the R&B singer has also suffered a number of financial setbacks recently.
Earlier this month it was revealed he owed $5 million is unpaid taxes dating back to 2005, and in 2011 he was also forced to sell his mansion in Chicago due to failure to keep up with mortgage payments.
Despite paying tax bills of $2.6 million in 2008 and $1 million in 2009, he still owes the US federal government more than $4.8 million.