Cats
Dogs
Articles
Tools
NewsEventsAbout us
General conditions

Uraemia in cats: symptoms, diagnosis and prevention

Uraemia is a serious condition developing as a result of chronic or acute kidney failure. When kidney filtration declines, metabolic waste, including urea, creatinine and other toxic products, accumulates and causes toxic effects throughout the body. Uraemia is fairly common in cats with chronic kidney disease, or CKD, particularly in its later stages.

8 min readSources

When to see a vet urgently

Contact a vet immediately if your cat has any of the following:

  • repeated vomiting, failure to eat and clear weakness;
  • attempts to urinate without passing urine, or a sudden end to urine production;
  • unsteadiness, confusion, seizures or collapse;
  • breathing difficulty or rapidly deteriorating general health;
  • possible exposure to a lily, antifreeze or a medicine that damages the kidneys.

Do not wait for symptoms after toxin exposure. Find a vet near you for emergency help.

Overview

The kidneys remove metabolic waste and maintain fluid and electrolyte balance. When function declines, toxins circulate in the blood and damage organs throughout the body. This condition is called uraemia. It causes disturbances of the nervous system, digestive tract, heart and mucous membranes, as well as general metabolic changes. In cats with CKD, uraemia is a major complication and strongly influences prognosis and lifespan.

Uraemia is a clinical syndrome, distinguished from azotaemia, which means raised nitrogenous waste values in the blood. Urea and creatinine help assess kidney function, but an abnormal laboratory result alone does not mean severe uraemic symptoms. Fluid, electrolyte and acid–base disturbances also form part of the picture.

Similar rises in blood values occur in different circumstances: reduced blood flow to the kidneys, actual kidney damage or obstruction of urine outflow. Distinguishing the cause matters because correcting dehydration, relieving an obstruction and managing chronic disease are different tasks.

Causes

The main causes of uraemia in cats include:

  • chronic kidney disease;
  • acute kidney failure due to poisoning, infection or injury;
  • urinary tract obstructions from stones, plugs or tumours;
  • kidney-damaging toxins, including ethylene glycol in antifreeze, some medicines and plant toxins;
  • severe infections and sepsis.

Acute injury can also occur in a cat with existing kidney disease. An earlier CKD diagnosis therefore does not mean every sudden deterioration is simply inevitable progression. Obstruction, infection, dehydration or a medicine's adverse effect may need separate treatment.

Lilies of the genera Lilium and Hemerocallis are particularly dangerous to cats. Exposure can occur through eating the plant, licking pollen from the coat or drinking vase water. Tell the vet immediately about suspected exposure even if your cat still looks healthy.

Risk factors

  • older age, over 7–8 years;
  • inherited predisposition to kidney diseases in some breeds, such as Persians, Maine Coons and Abyssinians;
  • chronic urinary tract diseases, including cystitis and stones;
  • an unbalanced diet with excessive protein and phosphorus;
  • lack of regular health checks.

The age listed is not a precise threshold, and young cats can also develop acute kidney injury. Breed-associated inherited kidney diseases differ and do not create the same uraemia risk in all the listed breeds. Ordinary bladder inflammation also does not automatically mean kidney damage.

Dietary protein content alone cannot establish the cause of uraemia. A kidney patient's nutrition is planned according to diagnosis, stage and muscle condition. Excessive restriction on your own can make adequate nutrition difficult, so simply reducing protein is not a home treatment.

Typical symptoms

Uraemia causes many signs:

  • refusing food or reduced appetite;
  • vomiting, nausea and drooling;
  • an ammonia-like smell from the mouth;
  • listlessness, weakness and reduced activity;
  • dehydration and weight loss;
  • pale or ulcerated mucous membranes, with mouth inflammation or a uraemic coating on the tongue;
  • unsteady walking, confusion and seizures in later stages;
  • increased or, conversely, reduced urination frequency.

With chronic disease, increased drinking and large urine volumes may precede severe nausea. Acute injury may increase, reduce or stop urine output. Passing urine alone therefore does not show that the kidneys remove enough waste.

Oral pain and nausea may cause a cat to approach food but not eat, drool or withdraw. However, an ammonia smell or mouth ulcer is not a reliable home diagnosis of uraemia. Other oral and gastrointestinal diseases can look similar.

Complications and consequences

Untreated uraemia leads to:

  • severe dehydration;
  • uraemic gastritis and stomach ulcers;
  • cardiovascular complications, including arrhythmias, high blood pressure and uraemic cardiomyopathy;
  • neurological problems, including seizures and coma;
  • death.

Blood potassium can rise dangerously, particularly when urine output stops or the urinary tract is obstructed. Conversely, potassium may be low in a kidney patient producing large amounts of urine. Neither situation is treated by guessing whether a supplement is needed; blood tests establish the disturbance.

The stomach ulcers listed are not a common or automatic consequence in every kidney patient. Excess stomach acidity and ulcers in feline CKD are less common than previously thought. Vomiting or nausea alone does not indicate an ulcer or mean acid-suppressing medicines are routinely needed.

Diagnosis at the vet

Investigations to establish uraemia include:

  • blood biochemistry showing raised creatinine and urea and electrolyte disturbances;
  • a complete blood count to assess anaemia and inflammatory signs;
  • urine testing for low specific gravity, proteinuria and casts;
  • kidney ultrasound to assess structural changes, cysts or small kidneys;
  • blood pressure measurement for hypertension in cats with CKD.

The vet asks about symptom onset, changes in drinking and urination, possible toxins and all medicines and supplements. Previous blood results and weight records help distinguish a long-standing change from an acute problem. Hydration and general health are assessed too.

As well as creatinine and urea, tests may assess phosphorus, potassium and acid–base balance. Urine concentration, protein and cell findings are interpreted alongside blood tests. Urine is not equally dilute in every kidney disease situation. Kidney size can also be small, normal or enlarged, so ultrasound findings depend on the cause.

CKD cannot be staged reliably from one sample taken during dehydration or acute illness. Possible circulatory and urine flow problems are addressed first, and values monitored. Staging in a stable patient helps plan long-term care; it does not replace emergency assessment.

Treatment

A cat with severe symptoms often needs hospital care. Treatment corrects fluid balance and confirmed electrolyte and acid–base disturbances, relieves nausea and addresses the cause. An obstruction must be relieved and any bacterial infection treated appropriately. Reducing a waste-product reading alone is not the only goal.

Fluids are tailored to dehydration, circulation and urine output. If the kidneys cannot remove fluid, excess can overload the body and worsen the situation. Do not increase a previously prescribed home fluid amount yourself during sudden deterioration. Breathing, weight and fluid balance may need close monitoring.

Supporting appetite, controlling nausea and providing nutrition are essential. If your cat still cannot eat enough, the vet may consider a feeding tube. Anaemia, blood pressure and phosphorus are also assessed in kidney disease. Gastroprotectants are chosen for a confirmed or strongly suspected need, rather than replacing investigation of nausea.

Severe kidney injury may warrant assessment for specialist treatment such as dialysis. Dialysis cleans the blood when kidney function is insufficient, but its role and goals depend on the cause and chances of recovery. It is not appropriate for every cat.

Home care and prognosis

Medicines, feeding and follow-up are agreed at discharge. Monitor eating, drinking, urination, weight trends and daily activity. Record vomiting, drooling and signs of mouth pain too. New weakness, failure to eat or difficulty urinating warrants contact; an existing plan does not automatically cover every new situation.

Provide accessible water and match food moisture to the care instructions. Do not give human painkillers or other medicines without assessment because kidney disease may change medicine safety. Contact the treating vet if you suspect an adverse effect from a prescription medicine too.

Acute injury may be partly reversible, while chronic kidney tissue loss generally cannot be restored. Cause, urine output, response and other diseases affect the outlook. One creatinine result alone does not determine remaining lifespan. In severe chronic disease, maintaining comfort and quality of life is a particular treatment goal.

Prevention

  • Arrange regular tests for cats over 7 years, including blood and urine tests and kidney ultrasound.
  • Prevent urinary tract diseases and have them treated promptly.
  • Provide appropriate feeding, including kidney diets and phosphorus and sodium restriction.
  • Keep fresh water available at all times.
  • Avoid toxins such as antifreeze, medicines and household chemicals.

A kidney diet is not started in every healthy cat just in case. Phosphorus and other nutrient targets depend on confirmed disease and test results, while adequate energy and muscle condition are maintained. The extent of monitoring also depends on symptoms, previous findings and individual risk, rather than seven years of age alone.

Keep kidney-toxic plants, antifreeze and medicines out of reach. When a vet prescribes a new medicine, mention known kidney disease. Suitability and monitoring can then be assessed before adverse effects occur.

Important for cat owners

Uraemia is one of the most serious consequences of kidney disease in cats. Remember that early CKD diagnosis and regular monitoring can delay complications and extend life. If your cat stops eating, vomits and is lethargic, contact a vet immediately.

This article provides general information and does not replace veterinary care. If you notice signs of illness in your cat, contact a vet.

Frequently asked questions

Does high creatinine always mean uraemia?

No. Azotaemia is a laboratory finding, while uraemia is a clinical syndrome caused by impaired kidney function. Values are interpreted alongside the cat's condition, urine tests and the cause.

Can a cat have serious kidney disease while still urinating?

Yes. The kidneys may produce urine while removing waste inadequately. Increased drinking and urination can also accompany kidney disease.

Can a cat recover from uraemia?

It depends on the cause and extent of damage. Some acute situations improve with treatment. Chronic disease care focuses on supporting remaining function, nutrition and quality of life.

This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.

Paw4care editorial team

Sources

Read next

All articles →

Vinegar poisoning in cats: symptoms, complications and prevention

Vinegar and concentrated acetic acid can irritate or burn a cat's tissues. Learn how concentration affects risk, warning signs and why not to induce vomiting.

Vitamin deficiency in cats: causes, symptoms and prevention

Vitamin deficiency in cats can affect the skin, nerves, bones and immune system. Learn about causes, warning signs, diagnosis, treatment and excess intake.

Walking dandruff in cats: Cheyletiella symptoms, treatment and prevention

Cheyletiella mites cause scaling, itching and walking dandruff in cats and can affect people. Learn about diagnosis, treatment, household control and prevention.
Tools
Cat symptom checkerVaccination scheduleIs it poisonous?Breed finderWhich breed suits you?Food calculatorAge in human yearsAll tools →