"I went in for an endoscopy Monday feeling great. But after dinner, I developed excruciating pain and have been hospitalized ever since," the 46-year-old Barker said on Instagram Stories.
He added that he had a small polyp removed in a "very sensitive area usually handled by specialists, which unfortunately damaged a critical pancreatic drainage tube." This resulted in severe life-threatening pancreatitis.
"I am so very very grateful that with intensive treatment I am currently much better," he concluded.
On Tuesday morning, Barker tweeted simply, "God save me," although it was unclear if the post was related to his medical condition. "God Save Me" is also the title of a song on which Barker and Machine Gun Kelly recently collaborated.
Late Tuesday afternoon, his 16-year-old daughter, Alabama Luella Barker, posted a note on Instagram saying, "Please send your prayers." She later posted a photo on TikTok, showing her holding her father's hand as he sat in a hospital bed, with the caption, "Please say a prayer." The post was later deleted.
Barker and Kardashian were married last month in Portofino, Italy.
The drummer has a history of health issues, including hospitalization for blood clots. He survived a plane crash that killed two people in 2008. Barker suffered third-degree burns on 65% of his body and was hospitalized for three months. He had 26 surgeries, according to media reports.