Thank you for your question.
NO physical tummy examination usually does not give any indication of colon or bowel cancers.
Masses that these cancers produce are very deep and cannot be felt on tummy examination.
Let me know if you have more questions.Please do submit a rating when you are done.Kindest regards
Yes these falls are common with cancers but there are heaps of other causes like reduced iron absorption, bleeding from an ulcer in the stomach or the intestine that are harmless can also cause such a problem.