Throughout the history of Dancing With The Stars, many celebrities have stepped foot inside the ballroom to try and be crowned the next DWTS champion. 336 celebrities have competed for the coveted mirrorball trophy, but only 28 (soon to be 29) have been crowned the winners. Throughout the many months of competition, the celebrities work hard with their pro dancers to perfect their dance.

With rehearsals taking place everyday up until the live show, the celebrities are tested both physically and mentally days leading up to their performance. While some celebrities' bodies can handle the process, that isn't always the case. According to Us Weekly, these are all of the celebrities that had to withdraw from the competition.

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Jeannie Mai - Season 29

Jeannie Mai was a frontrunner on this season of DWTS, she was partnered with Brandon Armstrong but unfortunately had to withdraw from the competition during week eight. It was revealed during the episode that she was diagnosed with epiglottis and needed to have emergency surgery, therefore withdrawing her from the competition. She finished in ninth place.

Ray Lewis - Season 28

Ray Lewis on Dancing with the Stars

Ray Lewis competed on season 28 of DWTS and was partnered with Cheryl Burke. During the season, the former NFL player tore three tendons in his foot that required surgery, forcing him to withdraw. The couple was only able to complete one dance before leaving the competition in 11th place.

Christie Brinkley - Season 28

Christie Brinkley Dancing with the Stars

Christie Brinkley was originally announced as one of the celebrities to be competing on DWTS 28, but she suffered an injury before the competition even began. As seen on the premiere episode, during rehearsals, Christie suffered a bad fall that caused her to shatter her arm and required surgery to fix. Luckily, Christie's daughter, Sailor Brinkley-Cook, stepped up in her mother's place, despite having huge stage fright.

Kim Zolciak-Biermann - Season 21

KIM ZOLCIAK

Kim Zolciak-Biermann competed during season 21, where she was partnered with Tony Dovolani. Although the couple completed three dances while on the show, the reality TV personality was forced to withdraw from the competition after suffering a mini stroke and being deemed unable to fly from Atlanta back to Los Angeles by doctors, despite being able to rehearse for the performance. The couple finished in 11th place.

Tamar Braxton - Season 21

Tamar Braxton competed alongside Zolciak-Biermann during season 21 of DWTS and was partnered with Valentin "Val" Chmerkovskiy. Tamar made it until week nine of the competition and was announced as safe before having to withdraw from the competition after doctors found pulmonary embolisms in her lungs. The pair just missed out on the semi-finals and finished in fifth place.

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Billy Dee Williams - Season 18

Where Are They Now Billy Dee Williams in Star Wars And Dancing With The Stars

Billy Dee Williams competed on Dancing With The Stars during season 18 where he was partnered with Emma Slater. Although the couple was able to complete three dances, it was announced at the start of week three that the actor was advised to withdraw from the competition due to a chronic back problem. The pair were the third couple to leave the competition and finished in 10th place.

Dorothy Hamill - Season 16

Dorothy Hamill competed on Season 16 of DWTS during the spring of 2013, where she was partnered with Tristan MacManus. Sadly, the couple was only able to complete two dances before withdrawing from the competition by doctors orders due to a back injury that she suffered prior. The pair was the first to go home and finished in 12th place.

Tom DeLay - Season 9

Tom DeLay competed on Dancing With The Stars during season 9, where he was partnered with Cheryl Burke. During the competition, the pair was able to dance three dances before withdrawing during week three due to stress fractures in both feet, despite being announced as safe earlier in the night. The couple finished in 13th place.

Jewel - Season 8

Jewel was originally announced as one of the celebrities to be competing on season eight alongside her then-husband, Ty Murray. The season was originally advertised as the first American series where a husband and wife would compete against each other, but sadly Jewel suffered a fractured tibia that prohibited her from competing in the competition. She was replaced with the show with model and reality TV star, Holly Madison.

Nancy O'Dell - Season 8 

Nancy O'Dell was also slated to compete on DWTS season 8, but was forced to withdraw from the competition as well, after suffering a torn meniscus. The injury required surgery, therefore deeming Nancy unable to compete. She was replaced on the show with former Dallas Cowboys Cheerleader and winner of The Bachelor 13, Melissa Rycroft.

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Misty May-Treanor - Season 7

Misty May-Treanor competed during the fall of 2008 where she was partnered with Maksim "Maks" Chmerkovskiy. Ultimately, the pair were able to complete four dances (although not being scored for their week three performance) before Misty was forced to withdraw from the competition after suffering a ruptured achilles tendon during rehearsals that required surgery, therefore forcing her to bow out of the competition. The pair finished in 10th place.

Sara Evans - Season 3

Sara Evans competed during season three of DWTS and was the first celebrity to ever withdraw from the competition. She was partnered with Tony Dovolani during the competition, and her withdrawal came a bit unexpectedly, as it was not due to injury but due to personal reasons instead. Though there was no explanation given, it was later revealed that she withdrew from the competition to be with her children after filing for divorce from her then-husband, Craig Schelske. The pair finished the competition in sixth place. According to Willa Ford, ABC offered the chance for Sara to return to the competition, but she declined.

With many celebrities dancing on the ballroom floor during the many seasons of Dancing With The Stars, and assuming many more are to come, it is unknown if these will be the last withdrawals that take place during the competition. Although, it seems that despite all the withdrawals, fans have continued to watch the show and will do so until the series ends.

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Dancing With The Stars airs Mondays at 8 Pm EST on ABC.

Source: Us Weekly