aged | Companion Animal Veterinary Hospital
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aged

Why is my old cat losing weight? Part 3

The signs of hyperthyroidism are increased appetite and weight loss. There is an old tabby cat's head looking to the lower right.

Hyperthyroidism

Hyperthyroidism is the overproduction of the thyroid hormones T3 and T4 from the thyroid glands. It is usually caused by a non-cancerous tumor of the gland, the cause of these tumors are not known but environmental and dietary factors may play a role.

Thyroid hormones influence many of the bodies organs so the effects of overproduction are felt throughout the body.

The signs

Initially the signs are subtle but progress over time. Affected cats:

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