A. Older kitties often suffer from Hyperthyroidism which can cause diarrhea, nervousness, excessive eating or also not eating well, losing weight , elevated heart rate, etc. A blood test can rule this out. Treatment is usually not difficult and not expensive. Unfortunately kidney disease can also cause diarrhea as can lymphoma. All these diseased can be ruled out or diagnosed with a blood test. Please make an appointment with your vet.
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