Just as all the other sensitivity during a migraine can be severe, so too can the problems with motion.
"It can be very disabling until it's brought under control, I really can believe she's unable to meet her obligations," said Rauch.
Rauch guessed Jackson would have a particularly challenging time managing her symptoms on tour, since preventing migraines requires a regular sleep, eating and exercise schedules.
But Jackson's publicist implied that everything was under control.
"She's a world-class entertainer and needs to be at the top of her game to give her fans the show they expect," said Crear, Janet's publicist. "She's feeling much better and is ready to hit the road again to finish the tour."