sineadcrazy.jpgSinead O'Connor has canceled her 2012 tour due to concerns over her mental health.

"With enormous regret I must announce that I have to cancel all touring for the year as am very unwell due to bi polar disorder," she wrote on her website. "As you all know I had a very serious breakdown between December and March and I had been advised by my doctor not to go on tour but didn't want to 'fail' or let anyone down as the tour was already booked to coincide with album release," she continued. "So very stupidly I ignored his advice to my great detriment, attempting to be stronger than I actually am. I apologize sincerely for any difficulties this may cause."

In October of 2007 the Irish singer revealed on The Oprah Winfrey Show that she had been diagnosed with bipolar disorder in 2003, and this January she checked in to a hospital for depression, just two weeks after ending her marriage to Barry Herridge.