If your older cat has suddenly become more vocal, restless, or constantly hungry but still seems to be losing weight, it might not just be old age or quirky behavior. These are classic signs of hyperthyroidism, a common endocrine disorder in senior cats. At Killarney Animal Hospital, we often diagnose and manage this condition, helping pets and their people navigate the road to better health.
What Exactly Is Feline Hyperthyroidism?
Hyperthyroidism happens when your cat’s thyroid gland produces too much thyroid hormone (T4). This hormone controls metabolism—so when there’s too much of it, your cat’s body goes into overdrive. The condition typically affects cats over the age of 10 and can impact almost every organ if left untreated.
The Subtle (And Not-So-Subtle) Signs to Watch For
Cats are masters at hiding illness, so the symptoms can sneak up on you. But there are some key changes that shouldn’t be ignored:
- Noticeable weight loss despite a healthy—or even ravenous—appetite
- Increased thirst and urination
- Restlessness or hyperactivity
- Vomiting or diarrhea
- Poor coat condition (greasy, matted, or unkempt fur)
- Behavior changes—like more vocalizing or seeming anxious
- Fast heart rate or high blood pressure
If your cat suddenly seems to have the energy of a kitten again, but they’re dropping weight or acting off, it’s worth getting them checked.
Why Early Diagnosis Makes a Big Difference
Hyperthyroidism can strain your cat’s heart, kidneys, and blood pressure if it goes untreated. At Killarney Animal Hospital, we use a simple blood test to check thyroid hormone levels and assess overall organ function to rule out or confirm the diagnosis. The earlier it’s caught, the easier it is to manage—and the better the outcome.
What Are The Treatment Options?
Thankfully, feline hyperthyroidism is very treatable. Depending on your cat’s health and lifestyle, we may recommend:
1. Medication (Methimazole):
Daily pills or a transdermal gel applied to the ear. It doesn’t cure the condition, but it controls the hormone levels effectively.
2. Prescription Diet (Hill’s y/d):
A low-iodine diet that helps reduce thyroid hormone production. Best used alone—no sneaky treats on the side.
3. Radioactive Iodine Therapy (I-131):
A one-time injection that destroys overactive thyroid tissue. It’s a true cure in most cases, but not widely available and requires isolation for a short period after treatment.
4. Surgery:
Surgical removal of the affected thyroid gland can also be curative, but it’s less common due to potential risks and the availability of less invasive options.
We work closely with you to decide what’s best for your cat’s age, other health conditions, and your lifestyle.
Supporting Your Cat Through Treatment and Beyond
Managing hyperthyroidism isn’t just about lowering hormone levels—it’s about supporting your cat’s quality of life. That might mean adjusting their diet, regularly checking bloodwork, and keeping an eye on how they’re feeling day to day.
At Killarney Animal Hospital, we help cat parents feel confident in managing long-term care. Whether it’s teaching you how to apply a transdermal gel or monitoring for side effects, our team is here every step of the way.
Don’t Wait If Something Feels Off
If your senior cat is acting a little “too energetic” or is losing weight without explanation, don’t dismiss it as aging. It could be hyperthyroidism, and early intervention can prevent bigger problems down the line.
To schedule a wellness check or blood test, give Killarney Animal Hospital a call at 604-433-5500. Helping cats stay healthy in their golden years is one of the things we do best.
