There are many reasons a cat may change their vocalization habits. The causes can be related to physical pain, discomfort, or disease as well as behavioral or environmental changes. Some of the most common causes of excessive vocalization in cats are as follows:
Physical Illness
Just like humans, cats express their discomfort when they are sick. Vocalizations can be expressions of pain, hunger, or thirst. Discomfort associated with chronic disease may also cause excessive vocalizations. Chronic kidney disease or
diabetes, for example, may cause excessive thirst, which in turn causes a cat to meow for water frequently.
Middle or Advanced Age
It is common for cats to become more vocal as they age. Vision, hearing, and other senses may be dulled, leading to fearful or aggressive behaviors. Physical discomfort and chronic disease may cause discomfort. Senility may contribute to excessive vocalization in senior cats.
Anxiety
Anxiety may cause cats to meow out of fear or aggression. Separation anxiety, situational distress, or conflict can cause an otherwise quiet cat to become vocal.
Mating or Territorial Behavior
Cats who are in heat or are fearful of encroachments on their territory may yowl, growl or otherwise vocalize instinctively. Your veterinarian can recognize whether your cat's vocalization is specific to any of these contexts.
Attention Seeking
Finally, many cats vocalize to catch the attention of their families. This may be especially true of a cat who is hungry. If you often reward a meowing cat with cuddles, petting, or treats, they may be conditioned to vocalize for attention. It is still important to consult a veterinarian to eliminate the possibility that your cat's behavior is the result of an underlying condition, especially if their behavior has changed suddenly.
It should also be noted that certain cat breeds, such as Siamese cats, are more vocal than others. This behavior would likely be exhibited throughout your cat's life.