Braxton posted a photo of herself in the hospital alongside her dance partner Val Chmerkovskiy. In the caption, she explains to fans that what she thought was pneumonia is actually blood clots in both sides of her lungs.
The 38-year-old was rushed to the hospital on Monday and missed her live performance. The judges scored her based on the dress rehearsal.
Braxton is the second star who has left the competition because of an illness this season.
Kim Zolciak-Biermann was disqualified back in September after she was unable to perform after a mini-stroke, also caused by a blood clot.