In 2006, season two contestant Romeo Miller withdrew from Dancing With The Stars due to injury and was replaced by his father Master P.
Pro dancer Derek Hough pulled his neck during rehearsal during season six in 2008 and missed a week of dancing.
Derek also passed out during rehearsal during season seven after tripping and landing on the back of his head.
Season seven also saw the departure of Misty May-Treanor after she was injured in training and ruptured her Achilles tendon.
Rehearsal injury: Misty May-Treanor is shown with host Tom Bergeron in October 2008 when she revealed she had torn her Achilles tendon during practice on Dancing With The Stars
Brooke Burke also badly bruised her foot during season seven while blocking the camera when she landed hard during a front flip with pro partner Derek.
Susan Lucci broke two bones in her foot during season seven, but remained in competition.
Nancy O’Dell pulled out of season eight due to a torn meniscus, along with Jewel breaking both of her shins just before the season premiere.
Steve-O also suffered a pulled muscle in season eight dress rehearsal and was unable to perform the salsa live.
Former House Majority Leader Tom DeLay withdrew from the competition in week three during season nine after injuring his foot during rehearsals for the premiere.
Billy Dee Williams had to pull out of Season 18 due to a chronic back problem.
Early departure; Billy Dee Williams withdrew early from Season 18 due to a chronic back problem
In Season 21, two contestants dropped out mid-season due to health issues, with Kim Zolciak leaving after suffering a mild stroke and Tamar Braxton pulling out after doctors discovered pulmonary embolism in her lungs.
Pro dancer Mark Ballas injured his back in rehearsal during Season 22 and was unable to perform with his partner, UFC fighter Paige VanZant, for a week.
Pro dancer Sharna Burgess injured her knee during season 23 during rehearsal with James Hinchcliffe and was out for two weeks.
Pro dancer Maksim Chmerkovskiy suffered a calf muscle injury during season 24 during rehearsal with Heather Morris and was replaced by dance troupe member Alan Bersten during a four-week recovery period.
Christie Brinkley broke her arm in practice five days before the season 28 premiere and was replaced by her daughter Sailor Brinkley-Cook.
Ray Lewis was forced to pull out of season 28 after suffering three torn tendons in his foot during training leading up to Week Three Movie Night. He again aggravated a 2010 injury while playing football for the Baltimore Ravens.
Intervening: Christie Brinkley broke her arm in practice five days before the season 28 premiere of DWTS and was replaced by her daughter Sailor Brinkley-Cook
Country singer Lauren Alaina revealed during Season 28’s Halloween Week that she had danced with “four bruised ribs,” after breaking one during the show’s first week and commenting that the others “don’t feel well.”
The Bachelorette star Kaitlyn Bristowe suffered an “ankle injury” during week two of Season 29, but still performed with pro partner Artem Chigvintsev. She later revealed on Disney Night that she was suffering from tendinitis and shin splints.
Pro dancer Cheryl Burke announced on September 26, 2021 that she had tested positive for COVID-19 before the second episode of Season 30. Her celebrity partner Cody Rigsby tested positive for the coronavirus a few days later and they continued to compete together, but danced in separate rooms.
Olympic gymnast Suni Lee during Season 30 also bolted after her performance on Queen Night to vomit, but rallied to stay in the competition.
Judge Derek Hough missed the season 30 finale after being diagnosed with COVID-19 and was replaced by his sister Julianne.
Pro dancer Daniella Karagach missed Elvis Night after testing positive for COVID-19 along with four crew members following the September 2022 premiere of season 31 on the Disney+ streaming service.
Selma Blair, who revealed in 2018 that she had been diagnosed with multiple sclerosis, retired from competition during Season 31 due to “excessive bone trauma” related to her chronic illness.
Valentin Chmerkovskiy missed Halloween Night in Season 31 after testing positive for COVID-19 and Mark Ballas performed on the episode after missing rehearsal due to a flare-up in his lower back.
Derek was scheduled to perform on the season 31 live finale with his fiancé Hayley Erbert, but she suffered a shoulder injury during prep the day before and was unable to dance with him.
Coronavirus infection: Pro dancer Cheryl Burke announced on September 26, 2021 that she had tested positive for COVID-19 and her pro partner Cody Rigsby tested positive a few days later forcing them to dance in separate rooms