Demi Lovato Cancels Concert Due to Swollen Vocal Cords Lovato announced on social media that she will not be performing in London due to her being "very, very sick." "If I go on tonight and injure my vocal cords any more I could potentially have to cancel the rest of the tour." "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." Lovato ended up rescheduling her concert for June 25. She later thanked her fans on Twitter for their understanding. TWEET Lovato's next performance will be in Amsterdam for June 18.