Skin, mucous membranes, sclera yellowish (jaundice, icterus) in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026
Table of contents

When to visit the vet?

Urgent see a veterinarian within 24 hours

?

RED for apathy, vomiting, collapse, tendency to bleed, significant abdominal pain, or neurological symptoms (e.g., disorientation, seizures).

Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity

Definition of

Jaundice, also known as icterus, is a condition in which a cat’s skin, mucous membranes, and sclera (the whites of the eyes) take on a yellowish tint. This happens due to an excessive accumulation of bilirubin, a breakdown product of hemoglobin from red blood cells, in the blood and tissues.

Can Occur with the Following Diseases:

Grundlagen und mögliche Ursachen

Bilirubin is a yellow pigment that is produced when old or damaged red blood cells are broken down. Normally, bilirubin is processed in the liver by binding to glucuronic acid and then excreted via the bile. Jaundice occurs when this process is disrupted, leading to a buildup of bilirubin in the blood.

The causes of icterus in cats can be divided into three main categories: prehepatic, hepatic, and posthepatic. Prehepatic icterus occurs when there is excessive destruction of red blood cells, as seen in hemolytic anemia. Hepatic icterus results from a disease of the liver itself, which impairs the normal processing and excretion of bilirubin. Posthepatic icterus is caused by a blockage in the bile ducts that obstructs the flow of bile.

Specific causes include infectious diseases such as Feline Infectious Peritonitis (FIP), liver diseases like hepatitis or hepatic lipidosis, as well as parasite infestations and toxic substances that can impair liver function. Tumors or bile duct diseases can also disrupt the drainage of bile and lead to posthepatic jaundice.

Typische Begleitsymptome

  • Loss of appetite: Cats with icterus often show a significant decrease in interest in food, which can lead to weight loss.
  • Lethargy: Affected cats are often unusually quiet and sleep more than usual, which indicates a general malaise.
  • Vomiting: Frequent vomiting can be an accompanying symptom that indicates liver disease or impairment of the digestive system.
  • Altered stool color: Feces may be pale or clay-colored, indicating reduced bilirubin excretion.
  • Increased thirst and frequent urination: These symptoms can occur when liver function is impaired and the electrolyte balance is disrupted.
  • Abdominal pain: In some cases, the cat shows signs of discomfort when the abdomen is touched, which may indicate liver enlargement or biliary tract disease.

Wann zum Tierarzt?

A veterinarian should be consulted immediately if a cat shows signs of jaundice. Since jaundice can be a symptom of a variety of conditions, a quick and accurate diagnosis is crucial to treat the underlying cause.

It is particularly important to visit the vet immediately if, in addition to jaundice, other severe symptoms such as severe lethargy, repeated vomiting, or signs of abdominal pain occur. These can indicate a serious and potentially life-threatening condition.

Symptomerkennung für den Tierhalter und tierärztliches diagnostisches Vorgehen

For the pet owner, the yellowing of the skin, mucous membranes, and eyes is the most obvious sign of icterus. However, it is important to also watch for other symptoms that could indicate an underlying disease.

The veterinarian will first perform a thorough clinical examination and take the cat’s medical history. Blood tests are crucial to measure bilirubin levels and assess the function of the liver and other organs. A complete blood count can help identify signs of hemolytic anemia or other blood disorders.

Additionally, imaging techniques such as ultrasound or X-ray can be used to examine the liver, bile ducts, and surrounding organs. In some cases, a biopsy of the liver may be required to make an accurate diagnosis.

Was kann der Tierhalter tun und professionelle Therapieoptionen

As a pet owner, you can take some measures to support your cat’s well-being while waiting for diagnosis and treatment by the vet. Make sure your cat has access to fresh water and try to encourage them to drink to avoid dehydration.

Feed your cat easily digestible, high-quality food that does not put additional strain on the liver. If your cat doesn’t want to eat, try offering small, frequent meals or talk to the vet about suitable appetite stimulants.

Avoid using medications or supplements without consulting the vet, as these can further damage the liver. Ensure your cat stays in a quiet environment, as stress can worsen the symptoms.

Ausblick auf aktuelle Forschung

Current research on jaundice in cats has a strong focus on improving diagnostic methods and developing non-invasive techniques. Scientists are working on refining imaging procedures such as ultrasound technology or magnetic resonance imaging to enable faster and more accurate diagnosis. These technologies could help identify and treat the main causes of jaundice, such as liver disease, bile duct obstructions, or hemolytic anemias, more efficiently.

Another area of research focuses on the molecular and genetic basis of icterus development in cats. By studying the genes and enzymes involved in bilirubin production and elimination, researchers hope to discover genetic predispositions or specific mutations that increase the risk of developing jaundice. Such findings could lead to more targeted therapeutic approaches and the development of prevention strategies.

The investigation of environmental factors and their influence on the liver health of cats is also an important aspect of current research. Scientists are investigating how different diets, toxins, and medications affect liver function and potentially contribute to the development of jaundice. These studies could lead to new guidelines in pet nutrition and care to minimize the risk of liver disease and associated symptoms like jaundice.

Additionally, the role of infectious diseases, such as feline infectious peritonitis (FIP) or bacterial infections, in the pathogenesis of jaundice is being investigated. Researchers are trying to understand the mechanisms through which such infections damage the liver and cause jaundice. These studies could lead to the development of new vaccines or therapeutic approaches that could help prevent or treat such infections.

Interdisciplinary collaboration between veterinarians, biologists, and biochemists is seen as crucial to gaining a more comprehensive understanding of jaundice in cats. Such collaborations could open the door to innovative treatments and a better prognosis for affected cats.

Finally, there are also efforts to raise awareness among cat owners about the importance of early detection of jaundice. Campaigns and information materials are intended to encourage pet owners to see a veterinarian immediately at the first signs of jaundice, such as a discoloration of the skin, mucous membranes, or eyes. This is crucial to avoid irreversible damage to the organs and to maintain or improve the animals’ quality of life.

Frequently Asked Questions (FAQs)

1. What is jaundice in cats?
Jaundice, also called icterus, is a symptom in which the skin, mucous membranes, and the whites of the eyes (sclera) turn yellowish. This discoloration is caused by an elevated bilirubin level in the blood, which can indicate problems with the liver, bile ducts, or red blood cells.
2. How do I recognize jaundice in my cat?
The yellowish discoloration of the skin is often hard to see in cats, especially in animals with dark fur. Pay attention to the color of the mucous membranes, such as the gums and eyelids, as well as the sclera of the eyes. A yellowish discoloration of these areas can indicate jaundice.
3. What causes can jaundice have in cats?
Jaundice in cats can be caused by a variety of factors, including liver disease, blockages in the bile ducts, infections, hemolytic anemia, or poisoning. An accurate diagnosis requires an examination by a veterinarian.
4. Is jaundice treatable in cats?
The treatment for jaundice depends on the underlying cause. Once the cause has been identified, targeted therapy can be initiated, which can range from medication and dietary adjustments to surgical procedures.
5. Can jaundice in cats disappear on its own?
While some less severe cases of jaundice may resolve without extensive treatment, it is important to determine and treat the underlying cause. Untreated jaundice can lead to serious health problems.
6. How is jaundice diagnosed in cats?
Diagnosis usually includes a thorough physical exam, blood tests to determine bilirubin levels, liver function tests, imaging procedures like ultrasound, and possibly a biopsy of the liver or other affected organs.
7. Can certain breeds be more susceptible to jaundice?
There are no specific breeds known to be more prone to jaundice. However, genetic factors and predispositions for certain liver diseases in some breeds can increase the risk.
8. What role does nutrition play in the prevention of jaundice?
A balanced diet tailored to the cat's specific needs can help support liver health and reduce the risk of jaundice. It is important to avoid toxins and harmful substances that can strain the liver.
9. Can environmental factors cause jaundice in cats?
Yes, environmental factors such as contact with toxic substances, contaminants, or certain medications can impair liver function and contribute to the development of jaundice.
10. How can I help my cat recover from jaundice?
After the diagnosis and treatment of the underlying cause, it is important to follow the veterinarian's instructions exactly. A stress-free environment, an adapted diet, and regular check-ups can contribute to recovery.