Some of the most common signs, as described by Cancer Research UK, are as follows:

Pain in the stomach or back

Chronic or unexplained abdominal pain that can spread to the back may be a sign of pancreatic cancer. This pain is especially felt after eating.

At the early stages, the pain may come and go, but when  the tumor grows larger it tends to be more constant and last longer.

Jaundice

Many people diagnosed with pancreatic cancer have jaundice—yellowing of the skin and eyes resulting in the buildup of bilirubin, a pigment produced by the liver.

This happens because the tumour blocks the bile duct.

Weight loss

Losing significant amount of weight due to no apparent reason is one of the signs of cancer in general, including pancreatic cancer.