Miley Cyrus could be in the hospital for a whole month

Miley Cyrus may have to stay in the hospital for up to 27 days.

The singer was rushed to the hospital this week because she had a scary allergic reaction. Her throat nearly closed up, and she could barely talk at all.

Her doctors figured out some medication she's on for a sinus infection are what caused the reaction. And they say Miley has to stay in the hospital until she gets better.

They think it may take her from 5 to 27 days to recover, meaning she'll have to cancel more concerts. Her rep said Miley "is devastated about missing shows and possibly disappointing her fans."

We hope she feels better soon!