Is it normal for my cat's drinking to increase?

Are you filling up the water bowl more frequently for your cat? This may be an early sign that something is not quite right. There are 4 common illnesses (diabetes, hyperthyroidism, kidney disease and diarrhea) that cause cats to drink more. Some of these illnesses are reversible, if caught early. All of these illnesses are worth knowing about so that you can seek treatment early and keep your cat as healthy as possible for as long as possible.