Two ways to determine if a stomach tumor (or anything) is bleeding. First, you can look at it directly (via EGD or esophagoduodenoscopy - a tube w/camera is stuck down your throat) for signs of bleeding. Or second, you can check serial (not cereal) blood counts and compare for loss of blood over time and presume that a steady decrease is due to the tumor. Since this is a concern, you should address this w/her family physician, gastroenterologist, or oncologist (or all three). Good luck! CT scans & MRIs aren't as useful for visualizing blood inside the stomach as they are for seeing blood elsewhere where it shouldn't be, eg brain.
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