On December 26, a representative revealed, "Heize was taken to the hospital early in the morning and is currently hospitalized. She had symptoms of sinusitis and wasn't treated properly in time, leading to further complications. A surgery has been scheduled."
The representative also shared, "It will be difficult for her to resume her scheduled activities during this time."
A day earlier on December 25 at '2017 SBS Gayo Daejun', Heize fainted after her collaboration stage with Lee Juk from a high fever and nausea and was rushed to the hospital.