Knowing the most common reasons cats got the vet is important in developing a preventative health plan for your cat. An interesting change in the top 10 lists was that feline enteritis (diarrhea). Diarrhea can be caused by stress, diet changes, intestinal obstruction, parasites or infections. The most common reason is dietary changes. Renal failure and the other conditions in the top 10 list above can be very costly (especially if they are chronic like Diabetes). All of the conditions on this list are potentially serious and they can all be expensive. Always look after for early sign, before it gets worst. Make sure you kids do frequent visit to the vet and always check the health history.