Hyperthyroidism is more often seen in older cats.
Cats with an overactive thyroid experience a dramatic increase in their metabolic rate, which requires more energy to function. A cat with hyperthyroidism has to eat a lot of food to provide this energy.
The most common symptom of hyperthyroidism is weight loss despite a ravenous appetite.
As the condition progresses it becomes increasingly difficult for a cat to eat enough to provide the huge amount of energy required, so they start to lose weight.
Not all cats will react to the disease in the same way and your cat may not necessarily display all of these signs. Wherever possible, it is always a good idea to keep a note of the changes you see in your cat’s habits, behaviour and appearance.
If you become concerned about your cat’s health and welfare, you should consult your veterinary surgeon immediately.