The most reliable signs that your cat may have a urinary tract infection are straining to urinate, making frequent trips to the litter box with little result, crying or vocalizing while urinating, and producing urine that’s bloody or unusually strong-smelling. These symptoms overlap with several other urinary conditions in cats, so a vet visit and urine test are the only way to confirm a true bacterial infection.
Signs to Watch For
Cats with urinary trouble tend to show a cluster of behavioral changes that are hard to miss once you know what to look for. The most common signs include:
- Straining in the litter box without producing much urine, or squatting for long periods
- Frequent litter box visits, sometimes every few minutes
- Urinating outside the litter box, especially in unusual spots like sinks, bathtubs, or on cool tile
- Vocalization or crying while attempting to urinate
- Blood in the urine, which may appear pink, red, or brownish
- Excessive licking of the genital area
- Vomiting in more advanced cases
Some cats become more withdrawn or irritable, while others become clingy. A cat that was previously perfect with litter box habits and suddenly starts having accidents is telling you something is wrong.
It Might Not Actually Be a UTI
Here’s something most cat owners don’t realize: true bacterial UTIs are relatively uncommon in cats, especially younger ones. In cats under 10 years old with urinary symptoms, fewer than 2% actually have a bacterial infection. The natural acidity and concentration of young cats’ urine makes it hostile to bacteria.
The umbrella term for urinary symptoms in cats is feline lower urinary tract disease, or FLUTD. It covers everything from bladder inflammation caused by stress (the most common culprit in younger cats) to bladder stones, urethral plugs, and actual infections. All of these conditions produce nearly identical symptoms, which is why you can’t diagnose a UTI just by watching your cat’s behavior.
Bacterial UTIs become much more common in cats older than 10, particularly females. Older cats are more prone to kidney disease and diabetes, both of which change the composition of urine in ways that allow bacteria to thrive. If your senior cat starts showing urinary symptoms, infection is a leading suspect.
When It’s an Emergency
Male cats face a life-threatening risk that female cats rarely do: complete urethral blockage. Because a male cat’s urethra is much narrower, it can become fully obstructed by crystals, mucus plugs, or inflammation. A blocked cat cannot urinate at all, and toxins begin building up in the bloodstream within hours.
Early signs of a blockage look similar to a UTI: straining, vocalizing, producing only drops of bloody urine. But if your male cat progresses to lethargy, loss of appetite, weakness, or collapse, the situation is critical. You may also be able to feel a large, firm, ball-shaped bladder in the lower abdomen. A complete blockage can be fatal within 24 to 72 hours. If your male cat is repeatedly straining with no urine output, treat it as an emergency and get to a vet immediately.
How Vets Diagnose a UTI
Your vet will start with a urinalysis, which checks for bacteria, white blood cells, crystals, and other abnormalities in a urine sample. The gold standard for collecting that sample is cystocentesis, where a needle draws urine directly from the bladder through the abdominal wall. This sounds alarming, but it’s quick, generally well-tolerated, and gives the cleanest possible sample. Urine collected by other methods (catching it during voiding or using a catheter) can pick up bacteria from the lower urinary tract that don’t indicate a true infection.
If bacteria are found, the vet will typically send the sample out for a culture and sensitivity test. This identifies exactly which bacteria are causing the infection and which antibiotics will work against it. Results usually take a few days, but they prevent guesswork and ensure your cat gets the right treatment the first time.
Collecting a Urine Sample at Home
Your vet may ask you to bring in a urine sample before the appointment. To collect one, place a clean, empty litter box with no litter in your cat’s usual spot. Many cats will use an empty box without complaint. If yours won’t, you can substitute non-absorbent materials like unpopped popcorn kernels, plastic beads, cut-up plastic straws, or specially made non-absorbent litter (sold under brand names like Kit4Cat). The goal is to let the urine pool at the bottom without being absorbed.
Once your cat urinates, use a clean syringe or pipette (your vet can provide one) to transfer the urine into a sealable container. Get it to the vet as soon as possible. If you can’t deliver it within a couple of hours, refrigerate it, but the sample should be less than 12 to 16 hours old. Urine left at room temperature can develop crystals that weren’t originally there, which can throw off results.
What Treatment Looks Like
If your cat does have a confirmed bacterial UTI, treatment is straightforward: antibiotics. For a simple, uncomplicated infection, current guidelines recommend 7 or fewer days of oral antibiotics. Your cat will likely start improving within the first two to three days, but finishing the full course matters to prevent the infection from bouncing back.
Complicated UTIs, meaning infections that recur, are tied to an underlying condition like diabetes, or involve resistant bacteria, may require up to 4 weeks of treatment. These cases usually need a follow-up urine culture after treatment ends to confirm the infection has cleared. Your vet may also investigate what’s making your cat susceptible to repeat infections, since healthy cats’ urinary tracts are naturally resistant to bacteria.
If the diagnosis turns out to be something other than a bacterial infection, which is the more likely outcome in younger cats, the treatment path will look quite different. Stress-related bladder inflammation, for instance, is managed through environmental enrichment, dietary changes, and sometimes anti-anxiety support rather than antibiotics.