Dancing with the Stars is often a battle of attrition.
It's one of the more physically and mentally demanding reality shows out there - and, as a result, the competition has taken its toll on a number of participants.
The following celebrities, for example, have been forced to leave Dancing with the Stars prior to actually being voted out:
Braxton is lucky to be alive. She formed blood clots on both of her lungs and was rushed to the hospital during Season 21, dropping out soon after. "With a Heavy heart I regret to inform you that my season of #dwts has to come to an end along with the rest of my tour dates with @musicbykem," she wrote on Instagram.
Also on Season 21, Kim Zolciak was unable to perform one week after suffering a stroke. She was therefore disqualified and went on to have heart surgery.
Billy Dee Williams
A chronic back issue cropped up and forced Billy Dee Williams out of Dancing with the Stars Season 18.
Jewel was supposed to compete on Season 8. However, she fractured her tibias just before the season began and Holly Madison took her spot.
Also took place prior to Season 8. This anchor withdrew after tearing her meniscus, which required surgery. Melissa Rycroft filled in and actually went on to win the All-Stars season.
After just two routine, the Olympic figure skater withdrew from the competition in season 16 due to a serious back injury.