If a person had pancreatic cancer that is causing left side pain (under the rib cage) and back pain, should you be experiencing weight loss too?

Pancreatic Cancer. Unfortunately even in this era of tremendous advances in oncology field pancreatic cancer is still a gruesome diagnosis. The most common symptom is jaundice and pain is rather rare and can be associated with very advanced disease with significant weight loss. Pain is more often associated with pancreatitis and specific tests should be done to rule out inflammation of the pancreas (pancreatitis).
Yes. Most common symptoms in patients with pancreatic cancer are pain and weight loss. Approximately 80% patient has weight loss as presenting symptoms.