Today, EDM superstar Avicii announced that he would be canceling all of his upcoming performances due to health issues, relating to surgery he received earlier this year to remove his gallbladder and appendix. Although canceling performances is an enormously difficult decision for huge pop stars, this sort of thing happens pretty often. Here are nine more artists who have canceled performances and even tours due to illness.

1. Taylor Swift

Back in 2011, Taylor Swift was forced to reschedule some shows in Charlotte and Atlanta on her tour in support of Speak Now when she came down with bronchitis. "I would never cancel if I thought I was physically able to perform these shows," she told her fans at the time.

2. Lorde

Earlier this year, Lorde was at the height of her powers, winning two Grammys and performing at Coachella in April. However, the day after her Coachella performance, the "Royals" singer revealed that she had come down with a chest infection, which forced her to cancel her tour of Australia. Still, it's pretty impressive that she managed to sing at Coachella with the beginnings of a chest infection.

3. Morrissey

Morrissey is probably more famous these days for canceling shows than actually performing them, and in the last year-and-a-half alone, the former Smiths singer has canceled two tours. In 2013, Moz was stricken with pneumonia, forcing him to cancel the last 22 dates of his North American tour, and just this past summer, he did it again, canceling five dates after allegedly catching a "horrendous cold" from opening act Kristeen Young. However, Young deflected the blame, saying she was stricken with an allergy attack, not a cold.

4. Fiona Apple

Back in 2012, Fiona Apple canceled her tour of South America, but not due to her own health issues. Instead, she took the time to take care of her 13-year-old pitbull Janet, whom Apple rescued as a puppy and had developed a tumor. Unfortunately, Janet passed away soon afterwards.

5. Rascal Flatts

Back in early August, country stars Rascal Flatts were forced to cancel three shows after lead singer Gary LeVox lost his voice. When your last name literally translates to "the voice," though, you're just asking for trouble like that.

6. Chance The Rapper

Chance The Rapper made headlines back in April when he brought out Justin Bieber for his set at Coachella, but he was forced to cancel his set at the festival's second weekend after contracting "a combination of the flu virus and tonsillitis." For no good reason whatsoever, I'll blame Justin Bieber for this.

7. Celine Dion

Perhaps the most extensive cancellation on this list comes from Celine Dion. The singer has taken an indefinite hiatus from her career in order to care for her husband René Angélil, who underwent surgery to remove a tumor from his throat back in December 2013. This hiatus includes postponement of Dion's Las Vegas residency, as well as the cancellation of her entire Asian tour.

8. Earl Sweatshirt

Back in July, Odd Future rapper Earl Sweatshirt announced that he would be cancelling the remainder of his summer tour dates, citing exhaustion and a "lack of self maintenance," though he still managed to perform at the Pitchfork Music Festival in Chicago.

9. Miley Cyrus

Back in April, Miley Cyrus canceled some European tour dates after coming down with a sinus infection. However, even more dates had to be canceled after the "Wrecking Ball" singer suffered an allergic reaction to the antibiotics she had been given.

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