What are the common symptoms of hypercalcemia?

Common symptoms include lethargy, decreased activity, reduced appetite, vomiting, and changes in bowel or urination habits. If you notice these signs, have your pet's blood tested by a vet as soon as possible.

What tests will the vet perform at the appointment?

Your vet will typically perform a physical examination, blood and urine tests, and may arrange X-rays, ultrasound, or advanced imaging as needed. A biopsy may be recommended if the cause needs to be confirmed histologically.

What observations at home can help at the appointment?

Record changes in demeanor, activity level, food intake, water consumption, vomiting frequency, and toileting habits. Video any unusual behaviors on your phone to show your vet.

Does hypercalcemia require long-term monitoring?

It depends on the cause. Some conditions require regular monitoring of calcium and kidney function with treatment or diet adjustments over time. Follow your vet's recommended check-up schedule.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Hypercalcemia in Dogs & Cats: Symptoms, Diagnosis & Care Guide [2025]

High blood calcium can be caused by tumors, kidney disease, excess vitamin D, and more. Symptoms include increased thirst and urination, loss of appetite, and vomiting. Treatment targets the underlying cause; IV fluids can rapidly lower calcium levels.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ACVIM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Persistent loss of consciousness or unresponsiveness
•Unable to stand and showing obvious weakness
•Continuous vomiting with inability to retain fluids, leading to dehydration

Schedule a Clinic Visit Soon (within 24–72 hours)

•Noticeably low energy or sluggish responses
•Reduced appetite or sudden refusal to eat for more than one day
•Significant changes in urination or defecation habits

01What symptoms indicate something is wrong?

Hypercalcemia commonly presents as changes in demeanor and activity level, and may cause digestive or neurological abnormalities. In some cases it is an emergency requiring prompt attention.

Depressed demeanor and slower or reduced responsiveness
Noticeably decreased activity, appearing weak or lethargic
Reduced appetite or sudden refusal to eat
Frequent or increased episodes of vomiting
Constipation or noticeable changes in bowel habits
Possible confusion, disorientation, or loss of consciousness

Seek emergency care immediately if you notice the following symptoms:

⚠️ Loss of consciousness or prolonged unresponsiveness
⚠️ Inability to stand or complete loss of strength
⚠️ Persistent vomiting with inability to stay hydrated

02How do you assess abnormalities at home? Key observation points and when to go to emergency

Observing and recording key information at home helps your vet quickly understand how the condition has progressed and prioritize the necessary tests.

Track changes in demeanor and activity level over time, noting when they started and how severe they are
Record daily appetite, food intake, and water consumption (amounts and frequency)
Log vomiting episodes: timing, frequency, and what was vomited (any blood or foreign material)
Observe and record urination and defecation frequency, stool consistency, and whether constipation is present
Use your phone to video vomiting, abnormal gait, or signs of confusion to share at the appointment

03How will the vet diagnose the condition? Common diagnostic tests

Your vet will use physical examination combined with laboratory and imaging tests to confirm abnormal calcium levels and identify a possible cause, arranging advanced tests if needed.

Physical examination

assessing demeanor, hydration status, and neurological or muscle responses

Blood tests

measuring total calcium, ionized calcium, and kidney and liver function markers

Urinalysis

evaluating kidney function and urinary calcium excretion

X-rays or ultrasound

checking the chest, abdomen, or bones for lesions

Advanced imaging or biopsy

used when a tumor or histological diagnosis is needed

04What treatment and care are needed after diagnosis? Medication, diet adjustment, and home care guide

Treatment varies by cause and severity, often combining supportive care with regular monitoring to reduce complication risk and track recovery.

The treatment approach depends on the degree of hypercalcemia and the underlying cause, as determined by your vet
Hospitalization for IV fluids and electrolyte monitoring may be needed to stabilize the condition
Adjust diet and fluid intake as directed by your vet to maintain electrolyte balance
Schedule regular follow-up visits to monitor calcium levels, kidney function, and clinical symptoms
Home care focuses on hydration and watching for changes in demeanor and food intake

05What should you prepare before the appointment? Key information to help your vet quickly identify the cause

Note when symptoms first started, how they have changed, and how severe they are

Bring a record of the past week's diet and water intake (amounts and frequency)

List all current medications and supplements your pet is taking

Bring a video of vomiting or abnormal behavior to assist the clinical assessment

Bring any previous test reports or imaging files (if available), and call ahead to make an appointment

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.