Showbiz
Rex Features
The singer, 42, is currently being monitored by doctors, according to W&W Public Relations.
Jackson hopes to reschedule her show, which was due to take place last night. Last Friday, she cancelled a concert in Detroit because of "production constraints".
She has 12 further dates on her Rock Witchu tour scheduled for October.
Details of Jackson's illness have not been released.
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More: Janet Jackson, Showbiz
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