TL;DR: Jaundice is a critical medical emergency in cats that signals a serious internal issue like liver disease or anemia. If you see yellowing on your cat's ears, gums, or eyes, contact an emergency vet immediately and share a photo to help with triage.
What is icterus or jaundice in cats?
Finding a yellow tint on your cat's ears, gums, or the whites of their eyes is a clinical condition known as jaundice or icterus. This discoloration is caused by an accumulation of bilirubin, a yellow pigment formed by the breakdown of red blood cells. Under normal conditions, the liver processes and excretes this pigment; however, when the liver is overwhelmed or diseased, or when red blood cells are being destroyed too quickly, the pigment builds up in the tissues.
Is yellowing of the skin or eyes a veterinary emergency for my cat?
- Urgency Level: High. Yellowing of the skin is always considered a medical emergency in cats.
- It is a visible sign of a significant internal health crisis, such as liver disease, feline infectious peritonitis (FIP), toxins, or severe anemia.
- Because cats can deteriorate rapidly when their liver function is compromised, you should contact an emergency veterinarian immediately for an evaluation.
How can sending a photo of my cat help the triage process?
- Provide a clear, high-resolution photo of the yellowing, especially on the ears or gums, when you contact your veterinarian.
- Photos allow the triage team to confirm the severity of the icterus remotely, as indoor lighting can sometimes be misleading.
- Sharing an image helps the clinic prioritize your cat's intake and prepare necessary diagnostic equipment, such as blood work and ultrasound, before you even arrive.
Clinical Context (Merck Veterinary Manual)
In cats, yellow skin, or jaundice (icterus), is always abnormal and warrants investigation. Jaundice results from hyperbilirubinemia, which can be caused by increased hemoprotein liberation (e.g., hemolytic anemia), bile duct occlusion, ruptured biliary tract, intrahepatic cholestasis, impaired hepatobiliary bilirubin processing, or sepsis. In jaundiced cats with regenerative anemia, hemolytic disorders such as immune-mediated hemolytic anemia and hemotropic Mycoplasma should be considered. Chronic bilirubin retention can impart tissue jaundice even in the absence of bilirubinuria.
Chapter: Urology, Hepatology, Hematology
Source: The Merck Veterinary Manual, 11th Edition (Page 435)