Jennifer Hudson has had to reschedule dates on her current North American tour over vocal issues.

“Due to strain found on her vocal chords, Jennifer Hudson has been instructed by her doctor to go on vocal rest,” her rep said in a statement Tuesday.

The tour — also featuring R&B crooner Robin Thicke –has rescheduled three dates so far. The Dallas tour stop, which was scheduled for Thursday, May 7, will now occur on May 16. Houston goes down May 17, while Jen’s May 3 date in Oakland, CA. has been moved to May 19.