A. Unfortunately there could be a lot of things going on. Some of them are more likely or unlikely depending on your cat's age, but I'll give you a general idea. You're describing two basic problems - lethargy and inappetance, which often go together in cats. Causes can include organ diseases, like kidney or liver problems, heart problems, hormonal diseases like diabetes, or blood disorders that cause anemia (low red blood cells). Your vet will likely recommend blood work and possibly x-rays to get started. But keep in mind it might take some testing to figure out what's going on, because these are pretty vague symptoms. Good luck.
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