Sinead O'Connor says she is cancelling her 2012 tour due to her bipolar disorder.
The singer made the announcement yesterday in a posting on her website.
She wrote that she is "very unwell" and had been advised by her doctor to not hit the road after her "very serious breakdown between December and March."
In December, O'Connor announced her split from therapist Barry Herridge after 16 days of marriage.
The Irish singer-songwriter is best known for the early 1990s hit "Nothing Compares 2 U."