Travis Barker was hospitalized for pancreatitis, according to a report from the US celebrity website TMZ.
Doctors said they believed the condition was caused by a recent colonoscopy.
Symptoms included nausea, severe abdominal pain, and vomiting.
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The Blink-182 drummer was taken to the hospital by ambulance in Los Angeles on Wednesday (NZT).
He tweeted, “God will save me,” at 10:45 am local time Tuesday (3:45 am Wednesday New Zealand time).