The star is currently touring the U.S. scouting talent for a new series of the reality show and completed the latest round of tryouts in Denver, Colorado on Tuesday (02Jul13).
However, Lovato reveals she has fallen sick and is suffering from a fever and swollen tonsils.
In a series of posts on Twitter.com, she writes, "Chills + fever + gross looking tonsils... = no bueno (good)... Sucks being so sick when you're alone and away from home. Someone... Come hold me... And bring me soup!!!"
The singer recently revealed she often struggles with throat problems, so she is planning to undergo surgery this summer (13) to have her tonsils removed.