Recognizing and Treating Feline Urolithiasis (Bladder Stones)
You might notice your cat straining to pee, passing small amounts of bloody urine, or crying in the litter box-common signs of bladder stones. Male cats are especially at risk for life-threatening blockages. Diagnosis often requires radiographs or ultrasound, plus urinalysis to check pH and crystals. Treatment varies: prescription diets can dissolve struvite stones, while calcium oxalate often needs surgery. Prevent recurrence with wet food, urine pH between 6.6–7.5, and ultrasound checks every 3–6 months. There’s more to keeping your cat’s urinary tract healthy than you might think.
We are supported by our audience. When you purchase through links on our site, we may earn an affiliate commission, at no extra cost for you. Learn more. Last update on 18th July 2026 / Images from Amazon Product Advertising API.
Notable Insights
- Bladder stones in cats often cause hematuria, dysuria, and frequent small urinations due to bladder irritation.
- Male cats are at higher risk of life-threatening urinary obstruction from stones due to narrow urethras.
- Diagnosis requires imaging: radiographs detect most stones, while ultrasound finds radiolucent types.
- Treatment involves stone removal via surgery, catheterization, or urohydropropulsion, depending on size and type.
- Prevention includes prescription diets, urine pH management, hydration, and regular monitoring with urinalysis or ultrasound.
What Are Bladder Stones in Cats?
Bladder stones, or uroliths, aren’t just uncomfortable for your cat-they can lead to serious urinary blockages if left unchecked. These rock-like mineral clumps form in the urinary bladder and can range from sand-like grains to pea-sized masses. In cats, the two most common types are calcium oxalate stones and struvite stones, together making up most diagnosed uroliths. Stone formation often stems from imbalanced urine pH, high mineral levels, urinary tract inflammation, or low crystallization inhibitors in the urine. Struvite stones typically develop in alkaline urine and can form without infection, unlike in dogs. You won’t be able to confirm bladder stones based on lower urinary tract signs alone-symptoms like straining or frequent urination overlap with other conditions. Radiographic imaging or ultrasound is essential for accurate diagnosis.
Common Signs of Bladder Stones in Cats
You might notice your cat showing signs of discomfort when using the litter box, and while lower urinary tract issues can stem from several causes, bladder stones are a common culprit. Hematuria, or blood in the urine, is the most frequent sign, caused by stones scraping the bladder wall. You may also see dysuria-straining to urinate-especially in male cats, whose narrow urethras are more prone to irritation or partial blockage. Pollakiuria (frequent small urinations) and stranguria (painful urination) often accompany these issues. Vocalization during urination and abdominal pain suggest significant inflammation. While full urinary obstruction is less common, it’s more likely in male cats and requires immediate care. These signs, particularly blood in the urine and straining to urinate, warrant a vet visit to confirm diagnosis and begin proper treatment.
Emergency Signs of Urinary Blockage
If your cat’s acting restless, crying out, or constantly crouching in the litter box with little to no urine coming out, it could be a sign of a life-threatening blockage-especially in males, whose narrow urethras make them far more vulnerable. This is a true emergency: male cats are at high risk for urethral blockage from stones or plugs, leading to urinary obstruction. Watch for straining to urinate, anuria (no urine), abdominal pain, vomiting, and sudden lethargy. Restlessness may progress to collapse as toxins build up. Without treatment, acute kidney injury and fatal heart arrhythmias can follow within 24–48 hours. Don’t wait-seek immediate vet care. Most cases need urethral catheterization to relieve the blockage, followed by stabilization and monitoring. Quick action saves lives.
How Bladder Stones Are Diagnosed
Once the immediate danger of a urinary blockage is ruled out or managed, your vet will start pinpointing the cause-and bladder stones are a common culprit. They’ll likely begin with radiographs, which easily detect radiopaque urinary stones like calcium oxalate and struvite stones-responsible for up to 80% of cases. But if the stones are radiolucent, such as urate or cystine, ultrasonography becomes essential for clear visualization. A urinalysis will also be performed to check urine pH, specific gravity, crystals, and infection; alkaline urine (pH > 7.5) often signals struvite stones. While bladder palpation can sometimes reveal larger stones, small or multiple bladder stones are often missed. For definitive diagnosis, stones removed surgically or via voiding urohydropropulsion are analyzed at a lab to confirm composition-key for guiding prevention.
Surgical vs. Non-Surgical Treatments
While some bladder stones can be managed without surgery, the right treatment depends on stone type, size, and your cat’s anatomy. If your cat has struvite stones, a prescription diet like Hill’s S/D can dissolve them in 2–4 weeks, offering a non-surgical treatment option-provided there’s no obstruction. For calcium oxalate stones, surgical removal via cystotomy is often necessary, especially for large or numerous deposits. Voiding urohydropulsion works for small stones under 3–5 mm, particularly in female cats. Laser lithotripsy, a minimally invasive method using a cystoscope, fragments stones but isn’t ideal for males due to narrow urethral anatomy. Percutaneous cystolithotomy is another minimally invasive alternative, with faster recovery and shorter hospitalization than traditional cystotomy.
How to Prevent Bladder Stones From Returning
After treating bladder stones, your next focus should be keeping them from coming back, since recurrence is common without the right preventive steps. Your cat’s diet plays a key role in maintaining urinary tract health and preventing recurrent stone formation. Here’s how to tailor prevention by stone type:
| Stone Type | Key Prevention Strategy | Monitoring Tool |
|---|---|---|
| Struvite stones | Prescription diet, lower urine pH (6.2–6.8) | Urinalysis, urine pH checks |
| Calcium oxalate | Increase water intake, dilute urine | Urine specific gravity <1.020 |
| Urate stones | Low-purine diet, allopurinol if needed | Urinalysis for crystals |
| All types | Maintain urine pH 6.6–7.5, frequent voiding | Ultrasound every 3–6 months |
Feed a prescription diet, prioritize wet food for water intake, and schedule routine urinalysis to catch issues early.
On a final note
You’ve got this-spotting feline urolithiasis early means quicker relief, so watch for straining, frequent trips to the litter box, or blood in urine. If your cat stops urinating, it’s an emergency, not a wait-and-see. Vets use ultrasound or X-rays to confirm stones, then recommend treatment: surgery for large stones, or prescription diets like Hill’s c/d or Royal Canin Urinary SO to dissolve smaller ones. Post-treatment, feed wet food-at least 5.5 oz cans twice daily-to boost water intake. Real-world tests show cats on consistent urinary diets have 85% fewer recurrences. Stick to routine urine checks every 6 months, keep litter boxes clean (one per cat, plus one extra), and always guarantee fresh water access. Prevention is simpler-and cheaper-than a crisis.
