Shania Twain 2015

 Shania Twain performs during her Rock This Country farewell tour at the Pepsi Center Aug. 14, 2015, in Denver, Colorado.

Daniel Petty/The Denver Post via Getty Images

Shania Twain has to cancel two shows: one at the Verizon Wireless Arena on Tuesday (Oct. 6) in Manchester, N.H., and the other at Times Union Center on Wednesday in Albany, N.Y., due to illness. The concerts will not be rescheduled.

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The country superstar set out on her Rock This Country tour in June of this year. She told Billboard in May that she's working on a new album, but it's in its early stages. Twain intends this tour to be her last but it may end sooner than expected.