The 21-year-old Miley Cyrus will remain in hospital for an unspecified time, reported Us magazine.
"Miley Cyrus was suffering from a sinus infection during her tour in NC a week ago. She was prescribed the antibiotic cephalexin, which she has now suffered an extreme allergic reaction to. This type of extreme reaction can last from 5 to 27 days in these types of cases.
"Miley Cyrus will remain hospitalized and is under a doctor's care until we see some improvement and is asking for your compassion and privacy at this time. Miley Cyrus is devastated about missing shows and possibly disappointing her fans," the statement from her representative said.
Miley Cyrus tweeted her disappointment over canceling her concerts.