The youngest Kardashian sibling claimed he wasn't feeling well over the holiday weekend. When his condition worsened, his family brought him to the hospital.
"He's home already. He went for a little and is fine now. It was a wake-up call," another source tells E! News. Kardashian's blood sugar levels were very high, and doctors told him that he needs to "lose weight, exercise and dramatically change his diet, or it will get worse."
The former reality star has stayed largely out of the public eye since gaining a significant amount of weight and skipping his sister Kim's wedding to Kanye West in 2014. He has not appeared on Keeping Up with the Kardashians since 2012.
Reports began circulating in September that Kardashian had already begun losing weight and was plotting a return to the spotlight.