How to check for a stomach or colon cancer? is the only sure way to get endoscopy?

Endoscopy+biopsy: Definitive diagnosis of either colon or stomach cancer usually requires endoscopy and biopsy, followed by examination of the tissue by a pathologist.

Yes.: The only sure way is to get endoscopy. Other tests like ct or x-rays with contrast (barium enema, upper gi) can sometimes see a tumor, but even then the scope will be your next test to to a biopsy. A scope is the way to go.

No but best: Gi barium study can check stomach. Barium enema or ct colonography can check colon. Check out radiologyinfo.Org.