General guidance — not a diagnosis. When in doubt, call your vet.
Yellow discoloration of a cat's gums, eye whites, inner ears, or lightly haired skin may be jaundice, also called icterus. Jaundice means bilirubin pigment has accumulated in the blood and tissues; it is a sign, not a diagnosis. Red blood cell destruction, liver dysfunction, and blocked bile flow are the three major pathways, and a veterinarian must distinguish among them promptly.
When to call your vet right away
Arrange prompt veterinary assessment for any convincing yellow discoloration. Go to an emergency clinic now if your cat also has:
- Collapse, severe weakness, rapid or difficult breathing, or very pale gums beneath the yellow tint.
- Repeated vomiting, inability to keep water down, a swollen or painful abdomen, or profound lethargy.
- No food intake, especially in an overweight cat or when poor appetite has continued beyond a single meal.
- Bruising, bleeding, red or brown urine, disorientation, seizures, or suspected toxin or medication exposure.
Do not wait for the yellow color to become brighter. Cats can hide illness, and some causes of jaundice progress quickly.
For cat owners
An article can't ask about your cat.
Describe what you're seeing. You'll get a few follow-up questions about your cat, then where it lands — vet today, watch closely, or no visit needed — and what to do at home meanwhile.
Where to look and what jaundice is
Check in neutral daylight rather than under a warm lamp. Lift the lip gently to view the gums, look at the whites around the eyes, and inspect the inner pinna of the ear or sparsely haired abdominal skin. Dark urine may accompany jaundice but is not specific. Yellow-brown tartar limited to tooth surfaces is not jaundice.
Bilirubin forms when hemoglobin from aging or damaged red blood cells is processed. The liver normally takes up bilirubin, modifies it, and sends it into bile for elimination. Merck groups jaundice by where this pathway fails: excessive bilirubin production from red blood cell breakdown, impaired hepatic handling, or impaired bile flow through the biliary tract.[1]
Three broad pathways
Red blood cell breakdown
When red cells are destroyed faster than the liver can process their pigment, jaundice may accompany anemia. Cats may have pale or yellow gums, weakness, rapid breathing, dark urine, fever, or collapse. Causes can include immune-mediated destruction, infections affecting red cells, toxins, oxidative injury, and other blood disorders. Appearance cannot identify the cause.
Liver-cell disease
Inflammation, hepatic lipidosis, infection, toxins, and infiltrative or neoplastic disease can impair bilirubin handling. A cat may stop eating, vomit, lose weight, hide, or develop abdominal discomfort. Hepatic lipidosis is a particular concern when a cat—often one with excess body weight—has had sustained poor intake. The feline hepatic lipidosis guide explains why loss of appetite and jaundice need timely care.
Blocked or impaired bile flow
Inflammation, pancreatitis, gallbladder or bile-duct disease, stones, masses, and other conditions can obstruct or slow bile flow. Merck notes that sudden complete bile-duct obstruction may produce lethargy, fever, jaundice, vomiting, pale stool, and appetite change.[2] The cat cholangitis guide and pancreatitis and triaditis guide cover common overlapping clinical patterns.
These pathways can overlap. A cat may have concurrent inflammation of the liver, pancreas, and intestine, and ultrasound findings do not always supply a final diagnosis.
What to observe before the appointment
Record when the color change was first noticed and whether it is spreading. Note the last normal meal, approximate food and water intake, vomiting, stool color, urine color and volume, energy, weight change, fever if measured without stress, and signs of pain. Take photographs in daylight for comparison.
List all prescriptions, supplements, topical products, and possible exposures. Tell the clinic about acetaminophen, onions or garlic, zinc-containing objects, rodenticides, essential oils, and any medication that was intended for another animal. Do not delay transport while trying to identify a toxin.
What not to do
Do not give acetaminophen, human pain relievers, herbal liver remedies, leftover antibiotics, or supplements unless directed by a veterinarian. Do not assume a yellow cat simply needs a special diet or extra water. Treatment for hemolysis is different from treatment for hepatic lipidosis or a bile-duct obstruction.
Do not force-feed a cat that is weak, vomiting, struggling to breathe, or unable to swallow normally. Aspiration is possible, and some cats need anti-nausea treatment, fluids, correction of electrolyte abnormalities, or a planned feeding tube rather than improvised syringe feeding.
What the veterinarian may do
The examination will assess mucous-membrane color, hydration, temperature, abdominal pain, liver size, bleeding, and cardiovascular stability. A complete blood count can evaluate anemia and red-cell changes. Chemistry testing measures bilirubin and organ-associated patterns; urinalysis, blood smear examination, infectious testing, and coagulation tests may be appropriate.
Ultrasound can assess the liver, gallbladder, bile ducts, pancreas, and intestine. Published feline biliary guidance emphasizes that ultrasound can identify dilated ducts, cysts, and stones and can guide sampling, while tissue or bile sampling may be needed to establish the cause.[3] The feline icterus workup outlines the clinician-facing diagnostic sequence.
Frequently Asked Questions
Where is jaundice easiest to see on a cat?
Check the gums, whites of the eyes, inner ear skin, and lightly haired skin in natural light. Do not rely on one photograph or a room with warm-colored lighting.
Are yellow teeth the same as jaundice?
No. Tartar can make tooth surfaces yellow or brown while the gums and eye whites remain their normal color. Jaundice affects soft tissues, not just the teeth.
Can a cat with jaundice wait until tomorrow?
A cat with true yellow discoloration should be assessed promptly, especially if not eating. Emergency care is appropriate for collapse, breathing difficulty, severe weakness, repeated vomiting, bleeding, or marked abdominal pain.
Can not eating cause jaundice in cats?
Prolonged poor intake can contribute to hepatic lipidosis, especially in an overweight cat, but jaundice has several other possible causes. The cause cannot be confirmed at home.
Does dark urine prove liver disease?
No. Concentrated urine, blood, and bilirubin can all alter color. A urinalysis and blood tests are needed to interpret the change.
Is jaundice contagious between cats?
Jaundice itself is not contagious; it is a sign. Some underlying infections may be transmissible, while many liver, biliary, and blood disorders are not.
Should I force-feed a jaundiced cat?
Do not force food or liquid into a weak, vomiting, or poorly swallowing cat. Call the veterinary team for feeding instructions because safe nutritional support depends on the cause and the cat's stability.
References
- Merck Veterinary Manual — Jaundice in small animals. https://www.merckvetmanual.com/digestive-system/pathophysiology-of-hepatic-disease-in-small-animals/jaundice-in-small-animals
- Merck Veterinary Manual — Disorders of the liver and gallbladder in cats. https://www.merckvetmanual.com/cat-owners/digestive-disorders-of-cats/disorders-of-the-liver-and-gallbladder-in-cats
- Otte et al. — Feline biliary tree and gallbladder disease: aetiology, diagnosis and treatment. https://pubmed.ncbi.nlm.nih.gov/28438089/