As cat owners, there's nothing more distressing than finding out that your feline friend is sick. In the case of a disorder such as feline hyperthyroidism, the consequences can be severe and have the potential to rob your pet of its health, comfort, and even its life. However, when armed with some basic knowledge, you'll be better able to help your cat through its illness and to hopefully catch the problem early on so you can ease your pet's suffering and improve its health with early treatment and intervention.

The Feline Thyroid Gland

The thyroid is a double-lobed gland located in the cat's neck, wrapped around its trachea. Consisting of spherical follicles, this gland is responsible for secreting the two thyroid hormones -- thyroxine (T4) and triiodothyronine (T3). These two iodine-containing hormones play a significant role in a number of physiological functions and have an effect on every cell in the feline body. In particular, T4 helps to regulate the cat's metabolic rate, or the rate at which the cat's cells burn energy.

Feline Hyperthyroidism

When a cat's thyroid does not function properly and produces too much of the T4 hormone, the cat develops the endocrine disorder known as hyperthyroidism. This disorder is most common in middle-aged and elderly cats and affects male and female cats equally. Since thyroid hormones have an effect on every part of the feline physiological system, hyperthyroidism can also affect every organ. As a result, this endocrine disorder can have numerous negative effects on a feline patient and can quickly become extremely dangerous if left untreated.

Consequences of Hyperthyroidism

Since the thyroxine hormone controls the metabolic rate of a cat's body, elevated levels of this hormone result in a higher rate of metabolic function. This causes an increase in blood pressure as well as an increased heart rate. This excessive stress upon the feline heart can eventually cause it to expand in size. Known as myocardial hypertrophy, this heart condition causes the organ to wear out more quickly than a normal heart and will eventually lead to heart failure if the myocardial hypertrophy and hyperthyroidism continue to go untreated.

Symptoms and Warning Signs

The fact that cat hyperthyroidism affects every cell in a feline's body and increases the animal's metabolic rate explains the nature and high number of different symptoms that this disorder can give rise to. While not all feline patients will experience the exact same set of symptoms, some of the most common warning signs of hyperthyroidism include a significantly increased appetite accompanied by weight loss, both of which directly result from the elevated metabolic rate. Hyperactivity, irritability, rapid breathing, and a rapid heart rate are also frequently displayed by cats suffering from this thyroid condition.

Causes

While there are likely many different factors that can contribute to the development of hyperthyroidism in a particular cat, this thyroid condition is caused by the presence of a tumour on the thyroid gland. Even though these tumours are often benign, they still trigger the overproduction of thyroid hormones. When it comes to possible contributing factors for cat hyperthyroidism, there is still much that is not understood. However, it's believed that factors such as age, environment, and diet could be related to the development of thyroid tumours which lead to feline hyperthyroidism.

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