2. Abdominal Pain
Pain in the abdomen may be associated with any number of causes. When abdominal pain comes and goes and is stronger when going from standing up to lying down, it could be a sign of tumor growth in the pancreas.
The pain in the abdomen may shift from the upper part of the abdomen to the back and may occur frequently after meals. Your doctor may look at the epicenter of where your pain is coming from in order to determine where to look for a possible tumor.