Zollinger-Ellison Syndrome is a rare condition where the body produces too much gastrin, a hormone that stimulates the stomach to produce acid. This excess acid can lead to severe stomach ulcers and other digestive issues. The syndrome is often caused by tumors called gastrinomas, which can be found in the pancreas or the duodenum. Symptoms of Zollinger-Ellison Syndrome include abdominal pain, diarrhea, and heartburn. Diagnosis typically involves blood tests to measure gastrin levels and imaging studies to locate any tumors. Treatment may include medications to reduce stomach acid and, in some cases, surgery to remove the gastrinomas.