Janet Jackson has been released from the Royal Victoria Hospital in Montreal, a hospital spokesperson told People.com on Tuesday (September 30). She was discharged after spending two hours at the hospital on Monday night for a still-undisclosed ailment.

“Yesterday evening she was checked into the Royal Victoria Hospital and left a couple of hours later,” Rebecca Burns, the spokeswoman for the McGill University Health Centre, which operates the hospital, told People.com.

The singer, currently on her Rock Witchu Tour, “got suddenly ill during the sound check” in Montreal and had to be rushed to the hospital, a rep for W&W Public Relations told TMZ.com. E! Online reported that Jackson hopes to reschedule the tour stop.

The tour, which also features LL Cool J, is slated to continue through October 22, although Jackson’s Wednesday show at TD Banknorth Garden in Boston has been postponed “due to illness,” according to the venue’s Web site. Her Philadelphia concert on Thursday was still on schedule at press time.

It’s been a bumpy tour — and year — for Jackson. On Friday, she postponed a show in Detroit due to “production constraints,” according to TMZ. Last week, Jackson announced that she would be parting ways with Island Def Jam Records after just 14 months. The singer’s publicist noted that the label agreed to dissolve the relationship upon Jackson’s request.

In March, Jackson released an album that reflected a return to her mid-’80s Control era in more ways than just the title. But since debuting at #1, the album has sold disappointingly, according to SoundScan. In interviews, Jackson hinted that she was unhappy with the way things were working out with the label.

Monday’s ailment isn’t the first illness that Jackson has battled this year. In April, while promoting Discipline, Jackson missed an appearance on “Saturday Night Live” due to illness. Boyfriend Jermaine Dupri told MTV News she had bronchitis.