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Hyperparathyroidism in Cats

By: Dr. Arnold Plotnick

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Primary hyperparathyroidism is a disorder resulting from excessive secretion of parathyroid hormone (PTH) by one or more of the parathyroid glands located in the neck. The excessive amounts of PTH cause an elevated calcium level in the bloodstream, and this can have harmful effects on the body and can make dogs and cats ill.

The most common cause of primary hyperparathyroidism is a single benign tumor, called an adenoma, on one of the parathyroid glands. Malignant tumors of the parathyroid gland are much less common.

Primary hyperparathyroidism is much more frequently diagnosed in dogs as compared to cats. Males and females are equally affected.

At first, the mildly elevated calcium levels don't cause any symptoms. As time progresses and the calcium levels continue to rise, clinical symptoms appear. Three main body systems are usually affected: the gastrointestinal system, the kidneys, and the nervous system.

What to Watch For

  • Excessive thirst and urination
  • Listlessness
  • Weakness or intolerance to exercise
  • Poor appetite
  • Shivering
  • Loss of muscle mass
  • Vomiting
  • Constipation
  • Stiff gait
  • Difficult or abnormal urination, such as straining, bloody urine, increased frequency of urination


  • A complete medical history and physical examination
  • Blood tests will be necessary to confirm the elevated calcium levels
  • Urinalysis
  • Ultrasound of the neck, as well as other affected organ systems
  • X-rays
  • An electrocardiogram to trace the electrical activity of the heart


    Treatments for primary hyperparathyroidism may include the following:

  • Surgical removal of the abnormal parathyroid gland
  • Hospital admission and administration of intravenous fluids and various medications may be necessary in cases where the calcium level in the bloodstream is dangerously high

    Home Care and Prevention

    Give medications as directed. If the abnormal parathyroid gland was surgically removed, cats will occasionally develop signs of LOW calcium 1 to 7 days post-operatively. Carefully monitor your pet at home for signs of low calcium, including panting, nervousness, muscle twitching, leg cramping, stiff gait and seizures.

    There is no known cause for primary hyperparathyroidism, therefore, there is no preventative care.

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