Noticing pink, red, or rust-colored urine from your cat — or spotting blood spots in the litter box — is understandably alarming. Hematuria (blood in the urine) in cats is a symptom, not a diagnosis, and it can stem from conditions that range from stress-related inflammation to bladder stones or even cancer. Here's what you need to know.
What Does Blood in Cat Urine Look Like?
The urine may appear pink, bright red, rust-colored, or brownish. Sometimes you can't see it with the naked eye and it's detected only on a urine test. You might notice your cat straining in the litter box, crying out while urinating, or urinating in unusual places (often because they associate the litter box with discomfort).
Common Causes
Feline Idiopathic Cystitis (FIC)
The most common cause of hematuria in cats, FIC is inflammation of the bladder that occurs without a detectable infection or structural cause. It's closely linked to stress — environmental changes, new pets, routine disruptions, or a multi-cat household with tension can all trigger an episode. Cats with FIC may urinate frequently in small amounts, strain, cry out, or urinate outside the litter box. Most cases resolve within 5–7 days with stress reduction and supportive care.
Urinary Tract Infection (UTI)
While less common in cats than in dogs (especially young cats), bacterial UTIs do occur — more frequently in older cats, females, and cats with diabetes or kidney disease. Signs include frequent urination, straining, crying during urination, and bloody or cloudy urine.
Bladder Stones or Crystals
Uroliths (bladder stones) and urinary crystals can irritate the bladder lining and cause bleeding. The most common types in cats are struvite and calcium oxalate crystals. Diet and hydration play important roles. Stones can sometimes be dissolved with a prescription diet; others require surgical removal.
Urethral Blockage (EMERGENCY)
This is the most urgent concern, especially in male cats. A blockage prevents urination entirely. If your male cat is straining repeatedly but producing little or no urine, crying in pain, or seems lethargic — go to an emergency vet immediately. A blocked urethra is life-threatening within 24–48 hours.
Trauma
A cat that has been hit by a car, fallen from a height, or had another traumatic experience may have internal bleeding that appears in the urine.
Cancer
Tumors of the bladder, urethra, or surrounding organs can cause hematuria, typically in older cats. Other signs may include weight loss, decreased appetite, or chronic recurrent urinary issues.
Emergency Signs — Seek Immediate Care If:
- Male cat straining without producing urine (possible urethral blockage)
- Cat is crying or vowling in pain while trying to urinate
- Complete inability to urinate for more than a few hours
- Lethargy, vomiting, or loss of appetite alongside urinary signs
- Distended, painful abdomen
What To Do at Home
- Check whether urine is being produced — if your cat is straining but producing nothing, this is an emergency.
- Collect a urine sample if possible — a fresh sample in a clean container helps your vet enormously.
- Increase water intake — feed wet food, add water to food, try a water fountain. Hydration is protective.
- Reduce stressors — for cats prone to FIC, environmental stress management is critical (clean litter boxes, quiet spaces, feliway diffusers).
- Schedule a vet visit — even if your cat seems fine otherwise, blood in urine warrants investigation.
Diet and Hydration's Role in Prevention
Cats are naturally low-thirst animals who evolved getting moisture from prey, not water bowls. Feeding exclusively dry kibble produces chronically concentrated urine — a major risk factor for FIC, crystals, and bladder irritation. Switching partially or fully to wet food is one of the most protective dietary changes possible for urinary health. Many cats also prefer moving water; a cat water fountain can meaningfully increase daily fluid intake. For cats with recurrent urinary issues, your vet may recommend a prescription urinary diet formulated to reduce crystal-forming minerals.
How Voyage Can Help
Worried about your cat's urinary symptoms? Voyage AI Vet can help you quickly assess whether the situation is an emergency — especially important at night or on weekends when your regular vet isn't available. Starting at $4.99/month.
Want to check if your cat's symptoms are serious? → Describe your cat's symptoms to Voyage
This article is for informational purposes only and is not a substitute for professional veterinary advice. If your cat is straining to urinate without producing urine, seek emergency veterinary care immediately.