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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
Thank you for adopting an older cat. Vomiting in an older cat can be from dozens of things; cats vomit with virtually every illness that they get. Even with heart disease, a main symptom is vomiting.If she is thin despite a good appetite and being always hungry, I would check her for hyperthyroidism. It is a treatable condition seen mainly in older cats, that causes a cat to be constantly hungry but to lose weight and vomit.Kidney disease, heart disease, parasites, pancreatis, inflammatory bowel disease, and intestinal cancer are other conditions that could be causing her vomiting and weight loss.The best place to start would be a physical exam and a blood test for hyperthyroidism; that is what I would do if she were mine.Please let me know if this is helpful and what other questions you may have.
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