what are the early warning signs of pancreatic cancer?
['Dark-colored urine.', 'Itchy skin.', 'Digestive problems, including abnormal stools, nausea or vomiting.', 'Pain in the upper abdomen, which may extend to the back.', 'Nausea.', 'Appetite loss.', 'Swollen gallbladder (usually found by a doctor during a physical exam)', 'Blood clots.']