Khloé Kardashian
Khloé Kardashian, photographed on the red carpet at the 2014 American Music Awards in Los Angeles on Nov. 23, 2014, shared a sad selfie on Monday after brother Rob Kardashian was hospitalized. Getty Images

Rob Kardashian is out of the hospital, but he's not in the clear after being diagnosed with diabetes, and Khloé Kardashian is well aware of that. The "Keeping Up With the Kardashians" star took to social media Monday night to show fans exactly how she was feeling about her brother's hospitalization.

As was reported by Us Weekly, the reality star uploaded a selfie to Instagram in which she appeared anything but happy. Khloé, 31, posed with her head resting on her chin, pouting for the camera. The caption simply reads, "Melancholy." It has not been confirmed that her feelings are directly linked to Rob's hospitalization, though the timing seems to suggest that it is.

Rob, 28, was hospitalized over the holiday weekend after growing ill. Doctors ran a series of tests that revealed that he had been unknowingly living with diabetes. Sources said physicians suggested that he loose weight, exercise and make some serious changes in his diet. As you may recall, Rob has spent much of the last few years in hiding after putting on more than 100 pounds.

The Kardashians have yet to speak out about Rob's recent health scare. He is believed to be focusing on getting healthy in 2016.