The bottom line first: if your cat keeps going back to the litter box, passes only small amounts of urine, or you spot blood, suspect cystitis and see a vet. And if no urine is coming out at all, it's an emergency measured in hours.
Cystitis is the problem you'll run into most often within feline lower urinary tract disease (FLUTD). In younger cats, the most common form is feline idiopathic cystitis (FIC) โ inflammation with no clear cause found even after testing โ and stress is considered a major trigger. Symptoms often start after a change: moving house, a new family member (human or animal), a change in the litter box setup, or unfamiliar noise. Beyond FIC, bladder stones, urethral crystals, and bacterial infections (mostly in older cats) can cause very similar signs. Because each cause is treated differently, an accurate diagnosis requires a veterinary exam.
If your cat strains but produces not a single drop, it may be a urethral obstruction. It happens most often in male cats, whose urethra is narrower, and when urine can't leave the body it can lead to acute kidney failure within a day or two โ a life-threatening emergency. If your cat cries in the box while only posturing, or shows vomiting and lethargy on top of it, go to a vet (emergency care) right away, even in the middle of the night. The most dangerous mistake is waiting it out thinking "maybe it's just constipation."
The most reliable way to prevent cystitis and its recurrence is to increase water intake so the urine stays dilute. Use wet food, place water bowls in several spots around the home, and try a pet fountain if your cat likes running water. To see how much water your cat should drink in a day, check our daily water intake calculator. For litter boxes, the basics are "number of cats + 1," placed somewhere quiet and scooped daily. Finally, when life changes are coming, reduce stress by providing hiding spots and vertical space. Obesity is also a risk factor, so keeping your cat at a healthy weight helps too.
Idiopathic cystitis sometimes settles down within a few days, but it recurs very often, and from the outside it is hard to tell apart from a dangerous condition like a urethral obstruction. Pain management also matters, so it is safest to have your cat seen by a vet when symptoms appear.
It depends on the cause. If bladder stones or crystals are behind the symptoms, a diet matched to their type may be needed โ that is a call for your vet to make after testing. In every case, what reliably helps is increasing water intake, for example with wet food, so the urine stays dilute.
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This content is general information and does not replace veterinary diagnosis. For an accurate diagnosis and treatment, always consult a veterinarian.