The Overactive Thyroid: Managing Hyperthyroidism in Your Cat
Introduction
Hyperthyroidism is a medical disorder characterized by the overproduction of thyroid hormones (T3 & T4). The disorder occurs due to a benign (noncancerous) enlargement, termed adenomatous hyperplasia, in the thyroid glands which are located in the neck area of a cat. Because the thyroid hormones influence many organs in a cat's body, hyperthyroidism can lead to secondary cardiovascular problems such as cardiomyopathy.
Symptoms: "Fat Cat" That Is Underweight
One of the typical signs of hyperthyroidism is a cat that eats very much but still loses weight. Symptoms include:
Weight loss:
In spite of polyphagia (increased hunger).
Polydipsia and Polyuria:
Increased thirst and urine output.
Bad condition of coat:
Fur becomes untidy, greasy, or matted.
Increased activity:
Hyperactivity, irritability, vocalization, especially at night.
GI Problems:
Sometimes accompanied with vomiting or diarrhea.
Heart problems:
Rapid heart rate (in severe cases, tachycardia).
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| Symptoms of hyperthyroidism in cats |
Diagnosis of the Disease
In case if you suspect that your pet is suffering from the disease, visit a veterinary hospital for doing blood tests:
T4 Total Test:
This test is considered to be the main diagnostic procedure. Elevated levels of T4 confirm the presence of the disease.
Physical Palpation:
The veterinarian will find that the cat has an enlarged thyroid gland (thyroid slip) through a physical examination.
Chemistry Profile:
For the effect on the activity of liver enzymes and kidneys.
Treatment options for Hyperthyroidism
There are four methods used to treat feline hyperthyroidism, including the following:
Medication (Methimazole):
An oral dose of daily medication that helps to stop the production of hormones. Although it is the common form of treatment, it needs life-long commitment from the cat's owners.
Radioactive Iodine (I-131):
The Gold Standard therapy that includes one-time administration of radioactive iodine which destroys the abnormal cells. It is a very effective form of treatment.
Prescription diet:
Feeding the cat with special food (Hill's y/d) with the limited amount of iodine.
Surgery (Thyroidectomy):
Surgical operation that aims at removing the affected lobes.
Conclusion
Feline hyperthyroidism is a curable disease, and once it is diagnosed properly, it is possible for cats to enjoy their remaining lives fully. Thus, it is important to monitor changes in the weight and appetites of senior cats as a means of discovering this "metabolic engine" problem.

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