Miley Cyrus Suffers Health Setback; Reschedules Amsterdam Concert

E! News has exclusively learned that Miley Cyrus has "had a health setback and her allergic reaction issues have returned." Doctors initially gave a prognosis that Cyrus would require anywhere from 5-27 days of recovery, and it seems that she's needing more time to get well.

But the timing couldn't be worse for the former Disney darling who is about to embark on the European leg of her sold-out Bangerz tour. Her upcoming concert in Amsterdam, which was originally scheduled for this coming Friday, is going to be rescheduled due to the singer's health issues.

As of now, there's no word if her entire tour will be postponed to give the songstress ample time she needs to rest and recuperate.

"Miley is very bummed about it," a source tells E News.

Earlier this month, Cyrus postponed the remainder of her US tour after being hospitalized due to an allergic reaction from medication.

Cyrus was understandably upset during her hospital stay and vented on Twitter about missing being on the road.

"This hospitals full of a bunch of QUACKS (get it??? Quacks) #punnyeveninthehospy#stayinglightlovingandpositive #imissbangerztour #tryingtonotbebitter," she wrote an Instagram selfie, donning a duck-face Oxygen mask. Cyrus also shared the new dates with her Twitter followers.