Common Symptoms

• The most common symptoms of hypercalcemia in cats include loss of appetite and lethargy, experienced by about 88 percent of cats with this disorder, according to the WSAVA.
  
  

No Symptoms

• Mild to moderate cases of feline hypercalcemia with no apparent cause may have no symptoms and might only be noticed during a routine blood test.
  
  

Other Possible Symptoms

• Additional signs of feline hypercalcemia may include increased urination, increased water consumption, constipation or diarrhea, weakness and vomiting.
  
  

Warning

• If very high blood calcium levels are not treated, serious damage to the kidneys and soft tissues can occur. A total of 38 percent of cats with hypercalcemia eventually experience renal failure, as noted by the WSAVA.
  
  

Diagnosis

• Diagnostic tests, including a complete blood count and urinalysis, are needed to exclude other diseases that cause similar symptoms to hypercalcemia.