A pancreatic tumor is an abnormal growth of cells in the pancreas, an organ involved in digestion and blood sugar regulation. Tumors may be benign (noncancerous) or malignant (cancerous), with pancreatic adenocarcinoma being the most common and aggressive type of cancer originating in the pancreatic ducts. Other tumors, such as neuroendocrine tumors, arise from hormone-producing cells and may behave differently. Early stages often produce few or no symptoms, but as the tumor grows, individuals may experience abdominal or back pain, jaundice (yellowing of the skin and eyes), unexplained weight loss, loss of appetite, nausea, or changes in blood sugar levels. Because symptoms frequently appear late, pancreatic tumors are often diagnosed at an advanced stage.