Ariana Grande says she is struggling with 'a lot of pain' and that she might have to cancel a concert

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(CNN) - Ariana Grande told her fans that she is "very sick" and that she may have to cancel her concert this Sunday.

In an Instagram post on Saturday, the pop star said her throat and head "still hurt a lot" and it's hard to breathe during a show. She said she had been struggling with this discomfort since her concert in London last month.

"I just don't know what's going on with my body right now and I need to solve it," Grande said.

Although canceling the concert is "the last thing I would like to do," Grande wrote, fans should take the post as a "gentle warning" in case they couldn't "make the concert happen" this Sunday.

Grande is scheduled to perform in Lexington, Kentucky, this Sunday, the next stop on its world tour that ends in December.

The singer said she is taking medication, "doing everything possible to get ahead."

Her fans wanted her recovery and encouraged her to take care of her health first.

"We don't want anything to happen to our beloved Ari," tweeted Ayoade Fridaos.

Ariana Grande