Demi Lovato canceled her concert Sunday after experiencing swollen vocal cords.
The 25-year-old singer apologized to fans on Twitter after rescheduling her show at The O2 Arena in London less than hour before she was to take the stage.
"I write this through tears of frustration and sadness that I have to postpone my concert in London at the O2 tonight due to being very, very sick and with swollen vocal cords that were examined by an ENT (dr.)," Lovato wrote. "If I go on tonight and injure my vocal cords anymore I could potentially have to cancel the rest of my tour."
"I'm so so so sorry to disappoint any of my fans in London," she said. "It breaks my heart to let you down. Just know I feel your frustration and I wouldn't do this unless I absolutely had to."
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