Quick Answer
Blood in cat urine (hematuria) most commonly results from feline lower urinary tract disease (FLUTD), urinary tract infections, bladder stones, or stress cystitis. See your vet within 24 hours. If your cat — especially a male — is straining to urinate with little output, this is an emergency requiring immediate veterinary care.
Table of Contents
What Hematuria Means
Hematuria is the medical term for blood in urine. In cats, it can be gross hematuria (visible pink, red, or brown discoloration you can see in the litter box) or microscopic hematuria (only detectable on a urinalysis at the vet).
Blood in the urine is never normal in cats. It always indicates some form of irritation, inflammation, or disease in the urinary tract — from the kidneys down through the ureters, bladder, and urethra. The good news is that many causes are highly treatable when caught early.
What Blood in Urine Looks Like
Pink-Tinged
Small amount of blood mixed with urine. Often the first sign owners notice in the litter.
Bright Red
Active bleeding, may see distinct drops or clots. Indicates significant irritation or trauma.
Dark Brown
Older blood that has been sitting. May indicate bleeding higher in the urinary tract (kidneys).
Causes of Blood in Cat Urine
Several conditions can cause hematuria in cats. Here are the most common, listed from most to least frequent:
Feline Idiopathic Cystitis (FIC) / Stress Cystitis
The single most common cause of bloody urine in cats under 10 years old. FIC causes bladder inflammation without an identifiable infection. Stress is the primary trigger — new pets, moving, changes in routine, or multi-cat household conflict.
FIC episodes are often self-limiting within 5-7 days but tend to recur without stress management and environmental enrichment.
Urinary Tract Infection (UTI)
Bacterial infections of the bladder are actually less common in young cats than many owners assume. True UTIs are more frequent in cats over 10 years old, diabetic cats, and cats with kidney disease. Requires antibiotics identified through urine culture.
Signs: bloody urine, foul-smelling urine, frequent urination, straining, and licking the genital area.
Bladder Stones (Uroliths)
Mineral deposits form in the bladder and irritate the bladder wall, causing bleeding. The two most common types are struvite (can often be dissolved with diet) and calcium oxalate (require surgical removal). Diagnosed with X-rays or ultrasound.
Stones can also migrate to the urethra and cause a life-threatening blockage, especially in male cats.
FLUTD (Feline Lower Urinary Tract Disease)
FLUTD is an umbrella term covering several conditions that affect the bladder and urethra, including FIC, UTIs, bladder stones, and urethral plugs. It affects approximately 1-3% of cats each year and is one of the most common reasons cats visit the vet.
Urinary Crystals
Microscopic crystals (struvite or calcium oxalate) in the urine irritate the bladder lining and cause bleeding. Crystals form when urine is too concentrated or has an abnormal pH. Dietary management and increased water intake are the primary treatments.
Bladder Cancer (Transitional Cell Carcinoma)
Less common but more serious. Typically affects older cats (10+ years). Signs include persistent bloody urine that does not respond to treatment, weight loss, and progressive difficulty urinating. Diagnosed via ultrasound and biopsy.
| Cause | Age Group | Frequency | Treatment |
|---|---|---|---|
| Stress cystitis (FIC) | 1-10 years | Most common | Stress reduction, pain meds |
| UTI | 10+ years | Common in seniors | Antibiotics |
| Bladder stones | Any age | Moderate | Diet or surgery |
| Urinary crystals | Any age | Moderate | Diet change, hydration |
| Bladder cancer | 10+ years | Uncommon | Surgery, chemo, palliative |
Signs to Watch For
Hematuria is often accompanied by other urinary symptoms. Watch for these warning signs:
- Pink, red, or brown urine in the litter box or on light-colored surfaces
- Frequent trips to the litter box with small amounts of urine
- Straining to urinate — crouching and pushing with visible effort
- Crying or vocalizing while in the litter box
- Urinating outside the litter box — a sudden behavior change
- Excessive licking of the genital area
- Foul-smelling urine — may indicate bacterial infection
- Blood clots in or near the litter box
Tip: Check the Litter
Blood can be hard to spot in dark-colored litter. If you suspect urinary issues, temporarily switch to white or light-colored non-clumping litter so you can monitor urine color more easily. You can also place a white paper towel or plastic wrap in one litter box to catch a sample.
Emergency Signs — When to Go NOW
Bloody urine combined with any of the following signs requires immediate emergency veterinary care:
- Straining to urinate with little or no urine output (possible urinary blockage)
- No urination for 12+ hours
- Vomiting combined with urinary symptoms
- Lethargy — cat won't move, barely responsive
- Distended or painful abdomen — hard belly
- Cold ears or paws — sign of circulatory compromise
- Collapse or inability to stand
Male cats with bloody urine and straining are at high risk of a complete urinary blockage, which is fatal within 24-48 hours without treatment. Do not wait.
How Vets Diagnose Hematuria
Your vet will use several diagnostic tools to identify the underlying cause:
Urinalysis
The first and most important test. Examines urine for blood cells, crystals, bacteria, protein, and pH. Can be performed immediately in the clinic.
Urine Culture & Sensitivity
Identifies the specific bacteria causing a UTI and which antibiotics will be effective. Takes 3-5 days for results but ensures targeted treatment.
Blood Work
Checks kidney values (BUN, creatinine), blood glucose (to rule out diabetes), and overall health. Especially important in older cats and those with recurrent episodes.
Imaging (X-rays or Ultrasound)
X-rays can detect most bladder stones. Ultrasound provides detailed images of the bladder wall, can identify tumors, and is better for calcium oxalate stones that may be small.
Expect to spend $200-$600 on initial diagnostics depending on which tests are needed. A simple urinalysis and exam may be $100-$200, while a full workup with imaging can be $400-$600+.
Treatment Options
Treatment depends entirely on the underlying cause. Here are the most common treatment approaches:
| Condition | Treatment | Estimated Cost |
|---|---|---|
| Stress cystitis (FIC) | Pain meds, anti-anxiety meds, environmental enrichment, stress reduction | $150-$400 |
| Bacterial UTI | Antibiotics (7-14 days based on culture), pain relief | $200-$500 |
| Struvite stones | Prescription dissolution diet (4-6 weeks), follow-up imaging | $300-$800 |
| Calcium oxalate stones | Surgical removal (cystotomy), preventive diet | $1,500-$3,000 |
| Urinary crystals | Prescription urinary diet, increased water intake | $200-$400 |
| Bladder cancer | Surgery, chemotherapy, NSAIDs (piroxicam), palliative care | $2,000-$5,000+ |
Urinary Health Products for Cats
Hill's Prescription Diet c/d Urinary Care Cat Food
Clinically proven to reduce the recurrence of urinary stones and crystals. Prescription diet for feline urinary health.
PetSafe Drinkwell Platinum Cat Water Fountain
Encourages cats to drink more water with flowing stream. 168 oz capacity, BPA-free, dishwasher-safe.
As an Amazon Associate, OurPetGroomer earns from qualifying purchases. Product prices are approximate and may change. We only recommend products we believe will benefit your pet.
Prevention: Hydration & Diet
Many cases of feline urinary disease can be prevented or significantly reduced through proper hydration, diet, and stress management:
Maximize water intake
Dilute urine is your cat's best defense against urinary problems. Use a cat water fountain (cats prefer moving water), place multiple water stations around the house, and add water to meals. Aim for clear, light-colored urine.
Feed wet food
Canned food contains 70-80% water versus 10% in dry food. Switching from dry-only to wet food is one of the single most impactful changes you can make for urinary health.
Consider a urinary health diet
If your vet recommends it, prescription urinary diets help maintain optimal urine pH, prevent crystal formation, and promote dilute urine. Especially important for cats with a history of stones or crystals.
Reduce stress
Since stress cystitis is the most common cause of bloody urine in younger cats, stress management is critical. Provide vertical spaces (cat trees), hiding spots, multiple litter boxes (one per cat plus one), and Feliway pheromone diffusers.
Litter box hygiene
A dirty litter box discourages urination, which concentrates urine and promotes crystal and stone formation. Scoop at least once daily and do a full litter change weekly. Provide one box per cat plus one extra.
Maintain a healthy weight
Overweight cats are at higher risk for urinary problems. Keep your cat at an ideal body weight through measured portions, interactive play, and avoiding free-feeding dry food.
Frequently Asked Questions
Why is my cat peeing blood?+
Is blood in cat urine an emergency?+
How do vets diagnose blood in cat urine?+
Can stress cause a cat to pee blood?+
How can I prevent blood in my cat's urine?+
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