Janet Jackson diagnosed with vertigo

The illness which forced Janet Jackson to cancel a string of shows has been diagnosed as vertigo, reports say.

The star was rushed to hospital last month just moments before she was due to go on stage. Under doctor's orders, the 42-year-old was then forced to postpone further dates on her 'Rock Witchu' tour.

According to Now, the mystery illness has been diagnosed as a rare form of migraine.

"After a thorough medical evaluation, it has been confirmed that Janet’s symptoms are being caused by a rare form of migraine called vestibular migraine or migraine-associated vertigo, for which she is currently receiving treatment," a statement reads.

Manager Kenneth Crear told E! Online: "She's feeling much better and is ready to hit the road again to finish the tour."