If you share your home with a senior cat, you may have noticed changes like weight loss, increased appetite, or restless behavior. These signs are often brushed off as normal aging, but they could point to a very common feline condition: hyperthyroidism. At Killarney Animal Hospital, we often diagnose this issue in older cats, and the good news is that with the right treatment, most cats can continue to live happy, healthy lives.
What is hyperthyroidism?
Hyperthyroidism occurs when the thyroid gland in a cat’s neck produces too much thyroid hormone. This hormone plays a major role in regulating metabolism. When it’s overproduced, the body’s processes speed up, which puts stress on many organs, especially the heart.
Why is it so common in older cats?
Unlike some conditions that can affect cats of any age, hyperthyroidism is strongly linked to aging. Most cats are diagnosed around the age of 12 to 13, though it can occur as early as 8. Research suggests that environmental factors, diet, and even certain chemicals in food packaging may contribute to the risk. Genetics may also play a role, but age is the biggest factor.
Signs you shouldn’t ignore
Hyperthyroidism can look a lot like “normal” aging, which is why it’s so important to recognize the signs:
- Weight loss despite a good or even increased appetite
- Increased thirst and urination
- Hyperactivity or restlessness
- Vomiting or diarrhea
- Unkempt coat or excessive shedding
- Rapid heartbeat or panting
If you’ve noticed one or more of these changes, it’s worth booking a checkup. The earlier hyperthyroidism is diagnosed, the easier it is to manage.
How it affects your cat’s overall health
Hyperthyroidism isn’t just a metabolism issue—it impacts the whole body. Left untreated, it can cause high blood pressure, heart disease, and kidney damage. These complications can shorten your cat’s lifespan and reduce quality of life. That’s why regular vet visits and early diagnosis are so crucial.
Treatment options
The good news is that hyperthyroidism is very treatable. Depending on your cat’s health, age, and lifestyle, your veterinarian may recommend:
- Medication: Daily oral medication to control thyroid hormone levels.
- Dietary therapy: A prescription diet low in iodine, which is required to produce thyroid hormone.
- Radioactive iodine therapy: A highly effective treatment that eliminates the overactive thyroid tissue, often curing the condition.
- Surgery: In some cases, removal of the thyroid gland may be considered.
Each option has its pros and cons, and your veterinarian can help determine what’s best for your cat.
Supporting your cat at home
Alongside veterinary care, there are steps you can take at home to keep your cat comfortable:
- Monitor their weight regularly.
- Keep fresh water available at all times.
- Stick to a consistent diet if your cat is on a prescription food.
- Watch for changes in behavior or appetite and report them to your vet.
When to call for help
If your older cat is losing weight, eating more, or acting unusually restless, it’s always worth getting checked for hyperthyroidism. At Killarney Animal Hospital, we can run simple blood tests to confirm the diagnosis and create a treatment plan tailored to your pet. With the right care, most cats with hyperthyroidism go on to live long, comfortable lives.
