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Blood in the Urine in Cats

Hematuria in Cats


Blood in the urine, a condition known as hematuria, may indicate a serious underlying disease process. Familial hematuria (a condition in which blood in the urine runs in certain families of animals) is usually implicated in young cats, while cancer is the usual cause in older cats. Females are at greater risk for urinary tract infections that lead to blood in the urine than are males.




Symptoms of hematuria include blood in the urine, a sign in itself. Red-tinged urine, with or without abnormal frequent passage of urine will be evident. In patients with cancer, a mass may be palpated during physical examination. Abdominal pain will be evident in some patients.


Patients with a blood-clotting disorder may present with subdermal skin hemorrhages, conditions known as petechiae and ecchymoses, which appear as bruises. These discolored spots will be indicated by round, purplish, non-raised patches on the skin.




  • Systemic causes are generally due to coagulopathy (clotting)
  • Low number of platelets or thrombocytes in the blood (a condition known as thrombocytopenia)
  • Diseases of the upper urinary tract are caused by inflammation of the blood vessels (known as vasculitis)
  • Upper urinary tract – the kidneys and ureters:
    • Structural or anatomic disease, such as cystic kidney disease and familial kidney disease
    • Metabolic diseases, such as kidney stones
    • Neoplasia
    • Infectious diseases
    • Nephritis
    • Idiopathic causes
    • Trauma
  • In the lower urinary tract:
    • Infectious disease
    • Inflammatory disease in the kidney
    • Unknown cause
    • Trauma
  • Lower Urinary Tract ‒ bladder and urethra:
    • Structural or anatomic issues such as bladder malformations are implicated in bringing on hematuria
    • Metabolic causes, such as stones, are possible
    • Neoplasia
  • Infectious disease (such as bacterial, fungal, and viral disease):
    • Idiopathic causes
    • Trauma
    • Chemotherapy can elicit hematuria
    • Unknown cause
    • Trauma
  • Issues involving the genitalia include metabolic conditions:
    • Heat cycle, or estrus
    • Neoplasia
    • Cancer or tumors
    • Iinfectious disease such as from bacteria and fungus
    • Inflammatory disease
    • Trauma 





You will need to give a thorough history of your cat's health, including a background history of symptoms, and possible incidents that might have precipitated this condition. The history you provide may give your veterinarian clues as to which organs are causing secondary symptoms. Your veterinarian will perform a thorough physical exam on your cat, with a complete blood profile, including a chemical blood profile, a complete blood count, and a urinalysis. In male cats, examination of an ejaculate sample will help to identify prostatic disease.


Differential diagnoses for blood-tinged urine will include other causes for discolored urine. The common urine reagent strip tests for blood are designed to detect red blood cells, hemoglobin, or protein. Diet will also be considered. If you are supplementing your cat's diet with vitamins or anything different from a regular kibble diet, you will need to share this with your veterinarian, since substantial doses of vitamin C (ascorbic aid) may cause false-negative reagent test strip results.


Ultrasonography, radiography, and contrast radiography may be useful in obtaining a diagnosis. If any mass lesions are indicated, a biopsy may be necessary for a definitive diagnosis. A vaginoscopy in female cats, or a cystoscopy in male cats will rule out neoplasia and lower urinary tract issues.


Comments  4

Leave Comment
  • Blood in urine
    07/28/2014 06:03pm

    Ive just noticed blood in my cats urine, he seems to be having little wee's (all over the house) as if he has cystitis & has to go there & then. He is on dried food & has fresh water supply but am I right in thinking sometimes they can get a bladder infection with lack of water sometimes caused by dry food?. It was been very hot here for 2 weeks now, so he may be a little dehydrated. He regularly eats furry creatures that he brings home, generally lazy & fat (not by over feeding by me) Obvs I will take him to the vet

  • Question of blood urine
    09/29/2014 12:12am

    In cats, can bloody urine be a symptom of diabetes?

  • Blood in Benny's urine
    11/07/2014 04:05am

    Benny is my rescue cat..found on the city streets years ago. He now has diabetes and a heart murmur. I have taken him to two vets the last one being one of the best in this state. He has blood in his urine and they say it's stress related ! Does this even sound right? Please help..

  • 12/29/2014 02:15am

    HI, did you ever get any answers to the problem? My cat is 9 and recently had blood in her urine, she had an X-ray and they didn't see any tumors or stones, no cancer cells in the urine, so they she has been on anti-inflammatory meds and anti-biotics for a small amount of bacteria they found, but they told me the same thing about it possibly being stress related???? its been a few weeks and its not getting better, any insight??

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