Blood In Cat Urine: The Causes, Symptoms, And Solutions Of Hematuria

Cat Conditions, Cats

Last Updated - December 12, 2023

Home / Cats / Blood In Cat Urine: The Causes, Symptoms, And Solutions Of Hematuria

Our feline companions bring us joy, comfort, and companionship, but when they exhibit unusual behaviors or symptoms, it can be a cause for concern. A worrisome symptom that frequently concerns cat owners is the presence of blood in their cat's urine. Discovering blood in your cat's urine, a condition known as hematuria can be a concerning and distressing experience. It's essential to remember that while it may be alarming, hematuria is not uncommon in cats, and it can indicate a range of underlying issues, some of which are easily treatable with timely intervention.

Why is my cat peeing blood? What might be responsible for the blood in your cat's urine? Is this a minor concern, or does it indicate a more serious health issue? How can you help your beloved feline friend when they are suffering from this distressing condition? In this comprehensive guide, we will dive into the world of hematuria in cats, shedding light on the causes, symptoms, diagnosis, and treatment options to help you navigate this challenging situation with confidence and care.

What Is Feline Hematuria

Feline hematuria is the term used to describe the presence of blood in a cat's urine. This condition can manifest in various ways, from faint pinkish discoloration to a more noticeable reddish or brownish hue in the urine. While it's not a disease, hematuria is a sign or symptom of an underlying issue within the cat's urinary tract or related systems. Understanding the underlying causes and potential consequences of feline hematuria is essential for accurate diagnosis and effective treatment.

There are two main types of feline hematuria:

Gross Hematuria: In this form, blood is visible to the naked eye in the cat's urine. The color of the urine can vary, appearing pink, red, or brown, depending on the quantity of blood within it.

Microscopic Hematuria: In this case, blood in the urine is not observable by the naked eye and can solely be identified via a microscopic analysis of a urine specimen. Even though the urine appears normal, this type of hematuria may still indicate an underlying issue.

What Does Blood in Cat Urine Look Like?

Blood in cat urine may vary in appearance. It can manifest as a faint pinkish tinge, a noticeable reddish hue, or even a brownish color. Sometimes, it might resemble small blood clots or streaks within the urine. The intensity of the cat's pee color can be contingent on the quantity of blood present.

Symptoms animals can display:

  • Straining to urinate

  • Frequent urination

  • Vomiting

  • Bloody or cloudy urine

  • Fever

  • Loss of bladder control

  • Weight loss or changes in appetite

  • Drinking more water

  • Lethargy

  • Strong odor to urine

  • Vomiting

What Are Common Causes of Blood In Cat Urine

Urinary Tract Infections (UTIs)

Urinary tract infections (UTIs) in cats can present in various ways, contingent on the particular part of the urinary tract that is impacted. Here are some common types of UTIs in cats:

Lower Urinary Tract Infections (Cystitis): Cystitis in cats' most common type of UTI. It involves inflammation of the urinary bladder.

Upper Urinary Tract Infections: Upper UTIs are less common in cats but can be more severe. These infections can involve the kidneys (pyelonephritis) or the ureters (the tubes connecting the kidneys to the bladder).

Bacterial Urinary Tract Infections: Bacterial UTIs develop when harmful bacteria, like Escherichia coli (E. coli), invade the urinary tract and reproduce. These infections can impact different urinary tract segments, encompassing the bladder, urethra, or kidneys.

Bladder Stones or Crystals

Crystals or stones can form in a cat's bladder when certain minerals accumulate and crystallize. These stones can irritate the bladder lining, leading to blood in the urine. Depending on their size, stones can lead to urinary blockages, constituting a medical emergency.


Cats can experience injuries to the urinary tract due to accidents, falls, or fights with other animals. Blunt trauma or injuries involving the abdomen or lower back can lead to hematuria. Trauma-related hematuria should be addressed promptly to assess and manage any internal injuries.

Feline Idiopathic Cystitis (FIC)

FIC is a specific subset of FUS. It refers to cases of feline lower urinary tract disease (FLUTD) where there is inflammation of the urinary bladder without an identifiable underlying cause. In other words, it's cystitis (bladder inflammation) of unknown origin. 


Tumors in the urinary tract can be benign or malignant. They may originate in the bladder, urethra, or nearby tissues. As these tumors grow, they can damage the surrounding tissues and cause hematuria. Early detection through imaging and biopsies is crucial for treatment planning.

Urinary Tract Obstruction

This occurrence is more prevalent in male cats because they have a narrower urethra. Obstruction occurs when material like crystals, urinary tract stones, or mucus plugs block the urethra, preventing urine from leaving the bladder. If you observe blood in your cat's urine and your cat is experiencing severe pain, it's crucial to reach out to a veterinarian promptly.

Blood Disorders

Cats with certain blood disorders or clotting abnormalities may experience spontaneous bleeding in various body systems. Conditions like hemophilia or thrombocytopenia can lead to hematuria.

Medications or Toxins

While rare, certain medications or toxic substances can lead to hematuria as a side effect or due to their harmful effects on the kidneys and bladder.

Anatomical abnormalities

Blood in the urine of very young cats may occasionally result from anatomical abnormalities.

Idiopathic Hematuria

In some cases, despite thorough diagnostic testing, a specific cause for hematuria may not be identified. Unlike other urinary conditions, idiopathic hematuria has no breed predisposition and can affect cats of any breed or age.

How Veterinarians Diagnose the Cause of Blood in Cat Urine

Physical Examination: The initial step is a comprehensive physical examination. The veterinarian will evaluate your cat's general health and examine for any indications of pain or discomfort. They will pay particular attention to the abdomen and lower back. Palpation may reveal abnormalities, such as bladder distension or tenderness.

Medical History: Your veterinarian will gather information about your cat's medical history. They will inquire about recent changes in behavior, diet, or environment. This history can provide crucial insights into potential triggers or underlying conditions contributing to the hematuria.

Urinalysis: Urinalysis is a fundamental diagnostic tool used to help determine whether the presence of blood is due to disease, inflammation, infection, or a condition impacting blood clotting or bleeding tendencies. A urine sample is collected, and several parameters are assessed:

  • Color and Clarity: The color and clarity of the urine are noted, as blood can give it a pink, red, or brownish hue.

  • Specific Gravity: Specific gravity helps determine urine concentration, indicating hydration status.

  • pH Level: Urine pH can provide clues about certain underlying conditions.

  • Presence of Blood: Microscopic examination of the urine reveals the presence of red blood cells, indicating hematuria.

  • Bacteria, Crystals, and Cells: The urinalysis can identify signs of infection, crystals, or abnormal cells.

Urine Culture: A urine culture is performed if a UTI is suspected. This test identifies the specific bacteria responsible for the infection, helping guide antibiotic treatment choices.

Blood Tests: Blood tests, including a complete blood count (CBC) and serum chemistry panel, are conducted to evaluate your cat's overall health. These tests can reveal abnormalities in red and white blood cell counts, kidney function, and electrolyte levels.

Imaging: X-rays and ultrasound are valuable imaging techniques to visualize the urinary tract. X-rays can help detect bladder stones or abnormal masses, while ultrasound provides a more detailed view of the bladder, kidneys, and surrounding tissues.

Cystoscopy: In cases where other diagnostic methods don't yield clear results or if a veterinarian suspects issues within the bladder or urethra, a cystoscopy may be recommended.

Biopsy: When a tumor or abnormal tissue is suspected, a biopsy may help determine whether the tissue is cancerous or benign and guide treatment decisions.

Coagulation Studies: If a bleeding disorder is suspected, coagulation studies, such as clotting factor assays, may be conducted.

Bloody Urine Treatment

Urinary Tract Infection (UTI): UTIs are typically treated with antibiotic therapy. It is crucial to ensure that your cat completes the full course of antibiotics to eliminate the infection completely.

Bladder Stones or Crystals: Management for bladder stones or crystals often involves a specialized prescription diet. These diets are designed to dissolve certain types of stones and prevent their recurrence. In certain instances, there may be a need for ongoing dietary adjustments. For larger or obstructive stones that impede the urinary tract, surgical removal or minimally invasive procedures may become essential to ensure proper clearance.

Feline Idiopathic Cystitis (FIC): Managing FIC is multifaceted. Stress reduction plays a vital role, necessitating the minimization of stressors in your cat's surroundings, the provision of mental and physical stimulation, and the maintenance of a steady routine. In some cases, your veterinarian may also recommend medications to alleviate pain and reduce inflammation during episodes of Feline Idiopathic Cystitis (FIC).

Tumors: The treatment for tumors varies based on the tumor's type and stage. Surgical removal is frequently the primary treatment option when feasible. In certain instances, additional therapies such as chemotherapy or radiation therapy may be contemplated, depending on the tumor's characteristics. For inoperable tumors, palliative care focuses on maintaining your cat's comfort and quality of life.

Obstruction: Immediate emergency care is vital for obstruction. Treatment includes catheterization to relieve the blockage, intravenous fluids to correct dehydration and electrolyte imbalances, and addressing the underlying cause.

Blood Disorders: The treatment approach for blood disorders depends on the diagnosis. It may involve medications, transfusions, or other therapies, as your veterinarian recommends.

Medications or Toxins: The first step in addressing medication-induced or toxin-related hematuria is discontinuing the medication or removing the toxin from your cat's environment. Your veterinarian may also provide supportive care to manage symptoms or complications.

Idiopathic Hematuria: Treatment for idiopathic hematuria primarily focuses on managing the symptoms and ensuring your cat's overall comfort. Routine check-ups with your veterinarian may be recommended to monitor your cat's condition over time.

Coagulation Disorders: The treatment plan for coagulation disorders is tailored to the specific clotting disorder diagnosed. It may involve medications or other therapies to manage bleeding episodes and prevent future complications.

How To Prevent Feline Hematuria

Preventing feline hematuria involves proactive measures to maintain your cat's urinary health. Maintain your cat's hydration by offering fresh water daily, and contemplate incorporating canned food to boost their moisture intake. Opt for premium cat food that promotes urinary health, such as those formulated to prevent the formation of crystals. It's crucial to ensure your cat consumes a nutritionally balanced diet specifically formulated and tested for its specific life stage rather than a generic "all life stages" food. Certain foods may contain elevated mineral levels that can potentially lead to the formation of crystals and urinary stones, increasing the risk of lower urinary tract disease. Keep the litter box clean, as hygiene is vital in preventing UTI. Minimize stress in your cat's environment through a consistent routine and enriching activities. Regular veterinary check-ups help detect early signs of urinary issues. Encouraging these practices fosters a healthy urinary system, reducing the risk of feline hematuria.

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About the Author

Doctor of veterinary medicine with extensive experience in animal welfare with a strong interest in feline medicine and plans to pursue ABVP-Feline specialty board certification. A key member of many local veterinary associations and avid reader of animal related science journals and studies.

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