Cat Hypercalcemia: Recognizing an Underdiagnosed Welfare Problem

Elevated blood calcium in cats causes a range of clinical signs and has multiple causes requiring investigation. Early recognition and treatment protects kidney and overall welfare.

Key Facts

Idiopathic hypercalcemia is the most common cause in cats and its cause is unknown
Signs include lethargy, poor appetite, increased drinking, and weight loss
Calcium deposits can develop in soft tissues including kidneys causing progressive damage
Dietary management with a low-calcium, high-fiber diet often resolves idiopathic cases
Lymphoma and other cancers are important causes requiring specific investigation

Welfare Considerations

Hypercalcemia causes chronic lethargy, nausea, and malaise that significantly impacts quality of life. The calcium-depleted state and associated renal calcification can cause progressive kidney damage if untreated. Idiopathic hypercalcemia, the most common form in cats, responds remarkably well to dietary management in many cases, providing an accessible treatment option. Failure to diagnose and treat hypercalcemia allows progressive kidney damage that represents avoidable welfare compromise. Blood calcium measurement should be a routine part of senior cat health screening to detect this underrecognized condition.

What You Can Do

Request calcium measurement as part of routine senior blood panels for cats over seven years
Seek investigation for cats showing lethargy, reduced appetite, and increased drinking
Follow dietary management protocols for idiopathic hypercalcemia carefully
Ensure lymphoma and other cancers are ruled out through appropriate investigation
Monitor calcium levels regularly after treatment to confirm resolution and detect recurrence
Maintain adequate hydration to protect kidney function during hypercalcemia management