02/08/2025
🐾 Hyperparathyroidism in Cats – What Every Pet Owner Should Know
Hyperparathyroidism is a rare but serious condition that affects the parathyroid glands — tiny glands near the thyroid that regulate calcium and phosphorus levels in the body. When these glands become overactive, the result can be catastrophic for your cat’s bones, kidneys, and overall health.
🧠 What Is Hyperparathyroidism?
It occurs when the parathyroid glands produce too much parathyroid hormone (PTH). This hormone is responsible for:
Increasing blood calcium levels
Decreasing blood phosphorus
Controlling bone resorption (breaking down bone to release calcium)
Too much PTH = too much calcium in the blood = bone loss, kidney strain, and muscle issues.
⚠️ Types of Hyperparathyroidism
Primary Hyperparathyroidism
Caused by a tumor (usually benign) in the parathyroid gland
Results in uncontrolled PTH production regardless of calcium levels
Secondary Hyperparathyroidism
Caused by chronic kidney disease (CKD) or poor nutrition
The body tries to compensate for low calcium or high phosphorus — leading to overproduction of PTH
Nutritional Secondary Hyperparathyroidism
Happens in young cats fed unbalanced homemade diets (especially low-calcium, high-phosphorus)
🐱 Symptoms to Watch For
Weakness or lethargy
Poor appetite
Vomiting or constipation
Muscle twitching or seizures
Bone pain or fractures (especially spine, legs, jaw)
Facial swelling or “rubber jaw” (advanced cases)
Weight loss despite eating well
👉 Note: Symptoms can be subtle at first — don’t wait too long!
🧪 Diagnosis
A veterinarian may recommend:
Blood tests (high calcium, low phosphorus, high PTH)
X-rays (bone thinning or fractures)
Ultrasound (to detect parathyroid tumors)
Kidney function tests
💊 Treatment Options
For primary hyperparathyroidism:
Surgical removal of the tumor (parathyroidectomy)
Monitoring calcium levels post-surgery to avoid sudden drop
For secondary (renal or nutritional):
Treat the underlying kidney disease
Correct the diet (balanced calcium:phosphorus ratio)
Phosphate binders and vitamin D supplements
Regular follow-up and lab tests
🛑 Prevention Tips
Avoid feeding cats raw or homemade diets without veterinary guidance
Monitor senior cats for signs of kidney disease
Ensure complete and balanced nutrition
Annual vet check-ups and routine bloodwork
📣 In Summary:
Hyperparathyroidism may be rare, but it's not to be underestimated. Early detection and proper management can help your cat live a longer, healthier life.
If you notice unusual symptoms — especially in older or chronically ill cats — talk to your vet immediately.