United Kingdom, Feb. 10 -- Demi Lovato has cancelled five concerts to "protect [her] health".

The 33-year-old singer is currently preparing for her upcoming It's Not That Deep Tour and while she is "so excited" to get out on the road, she has axed a number of shows because she was concerned she had "overextended" herself.

Demi announced on her Instagram Story: "My Lovatics - I'm so excited to get back on stage this year and visit you in as many cities as I can.

"While starting to prepare for the tour, I realized that I have overextended what may be possible.

"To protect my health, and ensure I can give you my all at each show, I need to build in more time to rest and rehearse and ultimately adjust to a schedule with some more time off...