X-5's Jin has been diagnosed with reflux esophagitis. On April 27th, Jin revealed that he had been experiencing indigestion and nausea, prompting his agency to take him to the hospital for a test. The idol was diagnosed with reflux esophagitis, "a condition in which the stomach contents (food or liquid) leak backwards from the stomach into the esophagus." Representatives of Open World Entertainment stated, "He had similar symptoms before his debut, so he underwent an endoscope examination. There weren't any problems at the time, but we feel that the stress he's been receiving since his debut has caused him to skip meals. We noticed that he vomited what he did eat, so he was taken to the hospital and diagnosed with reflux esophagitis and gastritis." They continued, "He'll be receiving treatments and will be on medication for about a month. We'll check his condition after then." Source: Sports Chosun via Nate, NCBI