The 21-year-old singer, whose 'Neon Lights' tour officially started in Vancouver on February 9, took to Twitter to inform about her bad health.
"Nooooooo!!! I just woke up sick!!! Chicken noodle soup and hot tea please.... Baby Jesus I need a miracle!!! I wanna sing tomorrow!!!," she wrote.
However, her illness failed to improve over the weekend and she added, "I'm not sure what's worse - chills while taking a hot shower or body aches while laying down."
Lovato also shared pictures of medical equipment, including a steam inhaler, assuring fans she is doing everything possible to be well enough to perform.