Blood in Your Cat's Urine: What It Can Mean

In this guide

Spotting blood in your cat's urine, medically called hematuria, is unsettling, and rightly so. While some causes are relatively straightforward to treat, blood in the urine should always prompt a vet visit rather than a wait and see approach.

Common causes

• Feline idiopathic cystitis, a stress linked bladder inflammation and the single most common cause of blood in a cat's urine, particularly in younger cats
• Urinary tract infections, more common in older cats and those with other health conditions such as diabetes
• Bladder stones or crystals, which irritate the bladder lining as they form or move
• A urethral blockage, an emergency in male cats due to their narrower urethra
• Less commonly, trauma, a clotting disorder, or a tumour of the urinary tract

Other signs that often go with it

• Straining to urinate or spending unusually long in the litter tray
• Frequent trips to the litter tray with only small amounts of urine each time
• Urinating outside the litter tray
• Excessive licking of the genital area
• Vocalising or appearing uncomfortable while urinating

Why stress plays such a large role

Feline idiopathic cystitis is closely linked to stress, and flare ups often follow a change in routine, a new pet or family member, a house move, or even rearranged furniture. Reducing stress, alongside providing multiple clean litter trays, safe hiding spots and consistent daily routines, is a genuine part of managing this condition rather than just a nice to have.

When it is an emergency

A male cat straining repeatedly with little or no urine coming out is a genuine emergency, since a blocked urethra can become fatal within a day or two if untreated. Do not wait to see if it resolves on its own; head to a vet or emergency clinic immediately.

Diagnosis and treatment

Vets typically run a urinalysis, blood work, and imaging such as an X-ray or ultrasound to look for stones or masses. Treatment depends entirely on the underlying cause, ranging from stress management and dietary changes for idiopathic cystitis, to antibiotics for infections, to surgery or catheterisation for blockages and stones.

A practical note on urine samples

If your vet asks you to bring a urine sample, it needs to be collected fresh and kept sterile, so a clean container rather than a used one matters, and it should ideally reach the clinic within a couple of hours. Some clinics provide non-absorbent litter substitute specifically for this purpose. Male cats are more prone to complete blockages because of their narrower urethra, while female cats more often show blood in the urine without a full blockage, though both sexes can develop any of the underlying conditions.

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