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Significantly Reduced Urination or No Urination (Anuria) in cats

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

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Definition

Significantly reduced urination or no urination (anuria) in cats refers to a cat’s inability to excrete urine in normal amounts or to produce any urine at all. This can be a serious medical problem that requires immediate veterinary care.

Can Occur with the Following Diseases:

Basics and possible causes

Urination is an essential physiological process that allows the body to excrete excess fluids and waste products. The kidneys filter the blood to produce urine, which then passes through the ureters into the bladder and is finally excreted through the urethra. A disruption in any of these areas can lead to reduced or absent urination.

One possible cause of anuria is a blockage of the urinary tract, often caused by urinary stones or crystals. These can block the urethra, especially in male cats, whose urethras are narrower. Tumors or injuries can also lead to a blockage.

Renal failure, either acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. or chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time., can also lead to anuria. AcuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. renal failure often occurs suddenly and can be triggered by toxins, infections, or dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse.. ChronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. renal failure develops gradually and is more common in older cats.

Furthermore, systemic diseases that affect blood flow to the kidneys, such as heart failure or low blood pressure, can influence the kidneys’ ability to produce urine. Neurological problems that disrupt control over bladder function can also play a role.

Typical accompanying symptoms

Increased licking of the genital region: Cats that have difficulty urinating often lick their genital region more frequently to relieve discomfort.
Painful or frequent urination: Cats with urinary tract problems often show signs of pain when urinating and may try to urinate more often without success.
Blood in the urine: This may indicate an injury or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. in the urinary tract and is often a serious symptom that requires immediate examination.
ApathyApathy refers to a state of indifference and reduced interest or lack of emotional involvement in activities or events that would normally arouse interest. and loss of appetite: A cat that is in pain or feels unwell often shows a reduced interest in food and activity.
Vomiting: Kidney failureRenal failure is a condition in which the kidneys can no longer adequately perform their function of filtering and excreting waste products from the blood. It can be acute or chronic and requires immediate medical treatment. can lead to a build-up of toxins in the blood, which 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. nausea and vomiting.
Altered water intake: Some cats drink more to compensate for fluid loss (dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse.), while others drink less due to discomfort.

When to see a vet?

A visit to the vet is essential as soon as you suspect your cat is having trouble urinating. Action must be taken immediately, especially if the cat is not passing any urine at all, as a urinary tract blockage can be a life-threatening problem.

If your cat shows signs of pain, such as frequent and unsuccessful visits to the litter box, or if blood is visible in the urine, you should also seek veterinary advice immediately. Delays can lead to serious complications.

Even if your cat appears lethargic, is not eating, or is vomiting, these are warning signs that indicate a more serious health problem that requires professional 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 treatment.

Symptom recognition for the pet owner and veterinary diagnostic procedure

As a pet owner, you can recognize signs of urinary tract problems early by closely observing your cat’s behavior. Watch for changes in how often they use the litter box, the color of the urine, and your cat’s general behavior.

The vet will perform a thorough examination to determine the cause of the anuria. Diagnostic procedures include a physical exam, where the vet feels the bladder for fullness and sensitivity to pain. A blood testA blood test is a laboratory procedure in which blood is drawn and analyzed to obtain information about the body's health. It can include various parameters such as blood sugar, blood count, liver and kidney values. can help assess kidney health and identify signs of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. or systemic disease.

A urinalysis can provide information about the presence of crystals, bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., or blood in the urine. Imaging techniques such as X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. or 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. are often used to look for urinary stones, tumors, or structural abnormalities.

What the pet owner can do and professional therapy options

While you wait for your vet to diagnose or treat your cat, there are some steps you can take to improve your cat’s comfort. Make sure your cat has access to fresh water to avoid dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse.. Encourage them to drink, perhaps by using a water fountain, which encourages many cats to drink more.

Avoid stressing your cat, 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 worsen symptoms. Keep their environment quiet and comfortable. Ensure the litter box is clean and in an easily accessible location to avoid unnecessary 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..

Do not give your cat any medication without consulting the vet, as this could make the situation worse. Wait for the vet’s instructions before starting any treatment.

In severe cases, especially with a complete blockage of the urinary tract, it is essential to have the cat treated immediately at a veterinary hospital, as surgical intervention or the insertion of a catheter may be necessary to clear the blockage and prevent life-threatening complications.

Outlook on current research

Research into anuria and severely reduced urination in cats has gained importance in recent years, as these symptoms often indicate serious health problems. Scientists are particularly investigating the underlying physiological mechanisms that lead to decreased urine production. Studies have shown that cats suffering from anuria often have impaired kidney function. Researchers are focusing on identifying the specific molecular pathways involved in regulating urine production.

A significant advance in research is the identification of biomarkers that could enable 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 kidney problems. These biomarkers could help better monitor and treat cats at risk for anuria early on. By using advanced imaging techniques such as magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs., researchers have also gained new insights into the structural changes in the kidneys that occur in affected cats.

Another important area of research is the development of new therapeutic approaches for treating anuria in cats. Scientists are investigating the effectiveness of various medications that can stimulate urine production or support kidney function. In addition, alternative therapies, such as stem cell 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., are being researched, which have the potential to regenerate damaged kidney tissue and improve urine production.

In the coming years, experts expect significant progress in preclinical and clinical research, which could lead to better treatment and 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. for cats with anuria. Collaboration between veterinarians, researchers, and pharmacologists will be crucial to putting new findings into practice and improving the quality of life for affected cats.

Frequently asked questions

What does it mean if my cat is not passing urine? It means your cat may be suffering from anuria, a condition where the kidney produces no urine or it is not excreted. This is a serious symptom that requires an immediate veterinary examination, as it can indicate serious health problems such as renal failure or urinary tract blockages.
What symptoms can occur in cats in addition to anuria? In addition to anuria, cats may also show symptoms such as loss of appetite, lethargy, vomiting, dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse., and pain when trying to urinate. These symptoms also require veterinary clarification to determine the cause and severity of the illness.
How is anuria diagnosed in cats? The vet may use a combination of blood tests, urinalysis, and imaging techniques 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. or X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. to diagnose anuria. These tests help assess kidney function and identify possible blockages or structural abnormalities.
What are the causes of anuria in cats? Anuria can be caused by various factors, including kidney disease, urinary tract obstructions, severe dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse., infections, or poisoning. Accurately determining the cause is important to start appropriate treatment.
Is anuria treatable in cats? The treatment for anuria depends on the underlying cause. In some cases, rapid medical intervention can restore urine production. For other, more serious causes, intensive treatment or even surgery may be required. 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. depends on the cause and the cat’s condition.
What can I do to prevent anuria in my cat? Regular veterinary check-ups and a balanced diet can help reduce the risk of kidney disease. It is also important that your cat has access to fresh water at all times to ensure adequate hydration.
How quickly should I act if I suspect anuria in my cat? Anuria is a potentially life-threatening condition that requires immediate veterinary examination. Delays in treatment can lead to irreversible damage to the kidneys and other organs.
Can home remedies help with anuria? Home remedies are not recommended for anuria, as they cannot fix the underlying problems. Professional veterinary treatment is essential to identify and appropriately treat the cause.
How often should I monitor my cat’s urine production? It is advisable to regularly observe your cat’s behavior and watch for changes in urine production. A sudden change can be an indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient's clinical condition. of a medical problem and should be investigated.
Can anuria recur in cats? Yes, anuria can recur, especially if the underlying cause is not fully resolved or if there is a chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. condition. Regular veterinary check-ups and proper care are important to prevent relapses.