Home » Diseases » In cats » Hepatic Lipidosis (Fatty Liver)

Hepatic Lipidosis (Fatty Liver) in cats

Occurrence: common
Location of illness: Abdomen/pelvis

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

When to visit the vet?

Urgent see a veterinarian within 24 hours

If the condition worsens / symptoms persist, consult a veterinarian.

Definition

Hepatic Lipidosis, also known as fatty liver, is a serious condition in cats characterized by an excessive accumulation of fat in the liver cells, leading to impaired liver function.

The most important facts at a glance

Hepatic lipidosis, also known as fatty liver, is a serious condition in cats that occurs when too much fat accumulates in the liver. This accumulation impairs normal liver function. Triggers can include stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., sudden dietary changes, or illnesses that reduce the cat’s appetite. Symptoms include loss of appetite, Weight loss, Vomiting, lethargy, and in severe cases jaundice. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made through clinical examinations, blood tests, and imaging such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. to confirm the fat accumulation. Treatment focuses on restoring food intake and supporting liver function, often through nutritional therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. with a feeding tube. Early treatment increases the chances of recovery, while the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may be worse in advanced disease. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. includes maintaining a healthy body weight and avoiding stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and sudden Weight loss. Regular veterinary visits are important to detect changes early. Current research is looking at the mechanisms of fat accumulation, genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases., and the role of diet and probiotics. These findings could improve the treatment and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of liver diseases in the future.

Causes

The liver is a central organ in metabolism that performs a wide range of vital functionsVital functions are essential bodily functions necessary to sustain life. These include breathing, heart rate, blood pressure, body temperature, and level of consciousness., including processing nutrients, detoxifying the body, and producing important proteins. In cats, the liver is particularly sensitive to metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. changes, especially during fat mobilization. If a cat is under stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. or does not eat enough, the body may start mobilizing fat reserves to generate energy. Normally, this fat is processed in the liver and used for energy production.

However, in cats the liver’s ability to process large amounts of mobilized fat can quickly become overwhelmed. This causes fat to accumulate in the liver cells, impairing normal liver function. This buildup of fat causes hepatic lipidosis. Various factors can triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. this imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems., including stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., a sudden change in diet, or an underlying illness that reduces the cat’s appetite.

Common triggers of hepatic lipidosis include stressors such as moving house, the loss of a pet companion, illness, or surgical procedures. Sudden and drastic Weight loss in overweight cats can also pose a risk. In addition, conditions such as diabetes mellitus, inflammatory bowel disease, or infections can occur as secondary causes by reducing appetite and triggering fat mobilization.

Symptoms

Very common symptoms:

Watery, Slimy, or Bloody Diarrhea

Common symptoms:

Rare symptoms:

The symptoms of hepatic lipidosis are often nonspecific and may develop gradually. One of the earliest signs is persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. loss of appetite, which leads to rapid Weight loss. Cats with hepatic lipidosis often show lethargy and general weakness.

Another common symptom is jaundice, a yellowing of the skin and mucous membranes caused by the buildup of bilirubinBilirubin is a yellow pigment that is produced when hemoglobin from red blood cells is broken down. It is further processed in the liver and then excreted via the bile. Elevated bilirubin levels may indicate liver dysfunction or impaired bile excretion., a breakdown product of hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs.. This can be especially visible around the eyes and on the gums. Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., or constipationConstipation is another word for infrequent bowel movements where the stool is hard and difficult to pass. In dogs and cats, this can be caused by diet, lack of exercise, or underlying health issues. may also occur, as well as increased salivation.

In advanced stages, the disease can lead to neurological symptoms because the liver is no longer able to remove toxicToxic means “poisonous” and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. substances from the blood. This can lead to Behavioral changes, disorientation, or seizures.

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of hepatic lipidosis is based on a combination of clinical signs, laboratory tests, and imaging procedures. The veterinarian will first take a thorough medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and perform a physical examination. Blood tests are essential to assess liver function and rule out other causes of the symptoms. Typically, elevated liver enzymesEnzymes are biological catalysts that accelerate specific chemical reactions in the body without being consumed. They play a crucial role in virtually all physiological processes. and bilirubinBilirubin is a yellow pigment that is produced when hemoglobin from red blood cells is broken down. It is further processed in the liver and then excreted via the bile. Elevated bilirubin levels may indicate liver dysfunction or impaired bile excretion. levels are found in the blood.

An ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. examination of the liver can provide indications of fatty liver by showing changes in the liver’s echogenicity. To confirm the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., fine-needle aspirationFine-needle aspiration is a minimally invasive diagnostic technique that uses a thin needle to extract cells or fluid from a tumor, lesion, or organ. This sample is then examined microscopically to make a diagnosis. or a liver biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. may be required. These procedures allow direct examination of liver tissue under a microscope to confirm the fat accumulation.

Therapy

Treatment of hepatic lipidosis focuses on supporting liver function and restoring food intake. Early and aggressive nutritional therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. is crucial to stop the mobilization of fat reserves and relieve the liver. It is often necessary to place a feeding tube to provide the cat with a high-calorie, high-protein diet.

Medication support may also be needed to control Nausea, stimulate appetite, and regulate electrolyte balanceThe electrolyte balance refers to the balance of electrolytes in the body, which is essential for many physiological processes. Disturbances in the electrolyte balance can lead to serious health problems.. In some cases, medications may also be used to support liver function and to treat Inflammatory conditions.

In addition to nutritional therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., treatment requires careful monitoring by the veterinarian to track progress and make adjustments if needed. Treatment may take several weeks before a clear improvement is seen.

Prognosis and follow-up care

The prognosis for cats with hepatic lipidosis depends on the severity of the disease and how early treatment begins. If the disease is recognized early and treated appropriately, many cats have a good chance of a full recovery. Nutritional support and medical care are crucial to successful treatment.

However, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may be less favorable in cats treated only at an advanced stage of the disease or in those with additional health problems. A rapid, decisive treatment approach significantly improves the chances of a positive prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop..

Prevention

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of hepatic lipidosis in cats focuses on maintaining a healthy body weight and avoiding sudden Weight loss. A balanced, nutritious diet is crucial to ensure your cat gets all necessary nutrients. Feed your cat high-quality food that matches its individual nutritional needs.

Regular veterinary visits are essential to monitor your cat’s health and respond early to possible weight changes. Make sure you recognize changes in your cat’s appetite or weight early and discuss them with your veterinarian.

If your cat is overweight, a weight-loss program should be carried out under veterinary supervision to ensure slow, safe Weight loss. Sudden diets or fasting periods should be avoided, as they can increase the risk of fatty liver disease.

Reducing stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. in your cat’s daily life is also important, as stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. can lead to loss of appetite. Make sure your cat has a stress-free environment and provide enough activities to prevent boredom.

Outlook on current research

Hepatic lipidosis, also known as fatty liver, is a serious condition in cats that often occurs in connection with a period of not eating or a drastic reduction in food intake. Current research focuses on understanding the exact mechanisms that lead to fat accumulation in the liver. Scientists are currently investigating the role of specific enzymesEnzymes are biological catalysts that accelerate specific chemical reactions in the body without being consumed. They play a crucial role in virtually all physiological processes. and hormones that influence fat metabolism in the liver. In particular, the role of the hormones insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. and glucagon, which regulate blood sugar levels and fat metabolism, is being studied intensively.

Another important area of research is the genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. to developing hepatic lipidosis. Researchers are trying to identify genetic markers that could make cats more susceptible to this condition. Such findings could lead to more targeted preventive measures and support the development of personalized treatment approaches.

The effects of dietary factors on the development and course of hepatic lipidosis are also a key focus of current research. Researchers are examining how specific nutrients or deficiencies may influence the risk of this condition. Some studies suggest that an unbalanced diet high in carbohydrates and low in proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. could increase the risk of fatty liver. Further research is needed to develop effective nutritional strategies that reduce the risk of fatty liver.

There is also research into early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of hepatic lipidosis using new imaging techniques and blood tests. The goal is to detect the disease at a stage when it is still reversible. Advances in diagnostic imagingDiagnostic imaging includes medical procedures that create images of the inside of the body to diagnose, monitor, or treat diseases and injuries. Examples include X-ray, ultrasound, computed tomography (CT), and magnetic resonance imaging (MRI). could help detect liver changes earlier and improve treatment outcomes.

A promising line of research is investigating the role of probiotics and prebiotics in the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. and treatment of fatty liver in cats. Modulating the gut microbiota could be a novel strategy to support liver health. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. results suggest that certain probiotics could improve liver function and prevent fat accumulation.

Overall, current research efforts aim to gain a deeper understanding of the pathophysiologyPathophysiology deals with the changes in physiological processes caused by diseases or injuries. It examines how these changes lead to the symptoms and signs of a disease. of hepatic lipidosis and develop new therapeutic approaches that can improve the quality of life of affected cats. These findings could also be transferable to other animal species and offer new perspectives for the treatment of liver diseases in general.

Frequently asked questions (FAQs)

What is Hepatic Lipidosis? Hepatic lipidosis, also known as fatty liver, is a condition in which excessive fat is stored in the liver cells. This impairs liver function and, if left untreated, can be life-threatening.
What are the symptoms of fatty liver? Common symptoms include loss of appetite, Weight loss, Vomiting, lethargy, jaundice (yellowing of the skin and eyes), and increased thirst and urination. Affected cats may also show Behavioral changes.
What causes hepatic lipidosis in cats? The most common cause is a period of not eating or a drastic reduction in food intake. This can be triggered by stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., illness, changes in the environment, or diet changes. As a result, the body mobilizes fat reserves that are stored in the liver, leading to overload.
How is hepatic lipidosis diagnosed? DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made through a combination of the cat’s medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., clinical signs, blood tests, ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., and possibly a liver biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions.. Blood tests often show elevated liver enzyme and bilirubinBilirubin is a yellow pigment that is produced when hemoglobin from red blood cells is broken down. It is further processed in the liver and then excreted via the bile. Elevated bilirubin levels may indicate liver dysfunction or impaired bile excretion. levels.
What treatment options are there? Treatment focuses on supporting liver function and providing sufficient nutrients. This can be done through assisted feeding, either by hand or via a nasalNasal refers to the nose and nasal cavities. In veterinary medicine, this can involve examinations, treatments, or diseases affecting the nose of dogs and cats. tube or stomach tube. In severe cases, an inpatient stay at a veterinary hospital may be necessary to stabilize the cat.
Can fatty liver be cured? Yes. With early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and appropriate treatment, many cats can make a full recovery. The key to recovery is quickly resuming food intake and supporting liver function.
How can I prevent my cat from developing fatty liver? A balanced diet and avoiding sudden diet changes are crucial. It is important to minimize stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and ensure your cat eats regularly. If your cat is ill or shows a reduced appetite, you should see a veterinarian immediately.
Which cats are most susceptible to hepatic lipidosis? Overweight cats are at higher risk because they mobilize more fat during a period of not eating. Older cats and cats with existing health problems are also more susceptible. Breed or sex do not appear to have a significant influence.
How long does it take to recover from fatty liver? Recovery time varies, but with appropriate treatment many cats show improvement within two to three weeks. Full recovery can take several weeks to months, depending on the severity of the disease and the cat’s overall health.
What role does nutrition play in the treatment? A balanced diet that is high in proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. and low in carbohydrates supports liver function and promotes recovery. In some cases, special diets may be required to meet the cat’s nutritional needs and reduce strain on the liver.

Frequently asked questions (FAQs)

1. What is Hepatic Lipidosis?

Hepatic lipidosis, also known as fatty liver, is a condition in which excessive fat is stored in the liver cells. This impairs liver function and, if left untreated, can be life-threatening.

2. What are the symptoms of fatty liver?

Common symptoms include loss of appetite, Weight loss, Vomiting, lethargy, jaundice (yellowing of the skin and eyes), and increased thirst and urination. Affected cats may also show Behavioral changes.

3. What causes hepatic lipidosis in cats?

The most common cause is a period of not eating or a drastic reduction in food intake. This can be triggered by stress, illness, changes in the environment, or diet changes. As a result, the body mobilizes fat reserves that are stored in the liver, leading to overload.

4. How is hepatic lipidosis diagnosed?

Diagnosis is usually made through a combination of the cat’s medical history, clinical signs, blood tests, ultrasound, and possibly a liver biopsy. Blood tests often show elevated liver enzyme and bilirubin levels.

5. What treatment options are there?

Treatment focuses on supporting liver function and providing sufficient nutrients. This can be done through assisted feeding, either by hand or via a nasal tube or stomach tube. In severe cases, an inpatient stay at a veterinary hospital may be necessary to stabilize the cat.

6. Can fatty liver be cured?

Yes. With early diagnosis and appropriate treatment, many cats can make a full recovery. The key to recovery is quickly resuming food intake and supporting liver function.

7. How can I prevent my cat from developing fatty liver?

A balanced diet and avoiding sudden diet changes are crucial. It is important to minimize stress and ensure your cat eats regularly. If your cat is ill or shows a reduced appetite, you should see a veterinarian immediately.

8. Which cats are most susceptible to hepatic lipidosis?

Overweight cats are at higher risk because they mobilize more fat during a period of not eating. Older cats and cats with existing health problems are also more susceptible. Breed or sex do not appear to have a significant influence.

9. How long does it take to recover from fatty liver?

Recovery time varies, but with appropriate treatment many cats show improvement within two to three weeks. Full recovery can take several weeks to months, depending on the severity of the disease and the cat’s overall health.

10. What role does nutrition play in the treatment?

A balanced diet that is high in protein and low in carbohydrates supports liver function and promotes recovery. In some cases, special diets may be required to meet the cat’s nutritional needs and reduce strain on the liver.