Are hunger pains a sign of stomach cancer?

No: Pancreatic cancer maybe, but usually stomach cancer produces internal bleeding first that may be noticed in vomiting.

Usually not: As stomach cancer goes with low acid in the stomach. Hunger pains is usually associated with high acid output. So if anything wrong it coukd be that you have high acid in the stomach. Check for ulcer. See if it bother you too much a gastroenterologist.