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Hi. My name is***** I'm sorry to hear about this situation with your daughter's cat. This may be something pretty serious for her, but could it be something that can be treated? There in is what their vet is going to try and determine. When I have an older cat that vomits up blood, I like to take x-rays on that cat and do blood work. That gets things going as far as finding out the issue. When blood is vomited, the source of the bleeding is looked for. Could she be swallowing blood from an oral lesion / dental disease? Could she have a stomach ulcer that is bleeding? Could there be a stomach tumor that is bleeding? Could she have swallowed something that has irritated the stomach lining? These are typically the top rule outs for this. Sometimes getting the specific answer is a challenge as a scoping of the stomach is the pinnacle of the diagnostic testing for it, but a lot of times treatment is started up and then response is judged.