Pet Education

Browse our veterinary-reviewed Dog and Cat Illness Guide to learn more about pet health. Always talk to your veterinarian if you have a concern about your pet's symptoms or health.
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Feline Hypercalcemia

Hypercalcemia is an abnormally high level of calcium in the blood.

Typically, calcium is stored in the bones and controlled by the parathyroid glands in the neck. With hypercalcemia, these glands send hormones to the bones to release excess calcium.

The kidneys get rid of the extra calcium through the urine; however, the kidneys cannot get rid of it when it is too much. This leads to kidney damage and failure.

The calcium deposits itself in the soft tissues, causing pain and inflammation. Additionally, the bones become weak and easily breakable.


While some cases are idiopathic (no known cause), other cases have an underlying disease, such as:


If you notice any of the above symptoms, go to your veterinarian right away. Too much calcium can lead to kidney damage.


To properly diagnose your cat with hypercalcemia, your veterinarian may perform the following:

If the tests confirm hypercalcemia, your veterinarian will perform other tests to look for an underlying cause:


Most veterinarians will recommend the following treatments for cats with hypercalcemia:

Additional treatment will focus on treating the underlying cause.

Some cases require surgery to remove the parathyroid gland.



Adult cats have a better prognosis than kittens, and with quick treatment, the prognosis improves. Organ damage may be life-long.

Medically Reviewed by Sara Ochoa, DVM

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