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Sinead O’Connor has cancelled her upcoming tour due to bipolar disorder.

According to Reuters, British media and fansites have quoted a statement that the Irish singer-songwriter is calling off her North American tour plans “with enormous regret” because she is “very unwell due to bipolar disorder.”

It is also reported that though she had a “very serious breakdown” between December and March, O’Connor ignored doctors warnings not to go on tour because she wanted to keep her commitments.

“So very stupidly I ignored his advice to my great detriment, attempting to be stronger than I actually am,” she said in the statement. “I apologize sincerely for any difficulties this may cause.”

The singer has had an eventful past few months, most notably with the release of a new album, How About I Be Me (And You Be You)?, in March. She also ended a 16-day marriage in December, but then shortly afterwards announced that the relationship was back on.

How About I Be Me (And You Be You)? Was released in March, and is O’Connor’s ninth solo album. The first single from the record, “The Wolf is Getting Married,” was released in February.

O’Connor released her first album, The Lion and the Cobra, in 1987, and received worldwide recognition with the release of her second album, I Do Not Want What I Haven’t Got. The latter album was released in 1990 and contains her most famous single to date, a cover of Prince’s “Nothing Compares 2 U.”

The album won the Grammy Award for Best Alternative Music Performance, though O’Connor refused to accept the nomination or the award. Since its release, the album has sold more than 2 million copies in the United States alone.

Though O’Connor has cancelled all dates for her tour, she has announced that she still hopes to appear at a Curtis Mayfield tribute concert which will be held at the Lincoln Center in July.