Here is the short version: a cat squatting in the litter box again and again with little or nothing coming out is not being fussy, it is a medical emergency until proven otherwise, especially if it is a male cat. The most common urinary disease in cats is uncomfortable but not usually deadly. The version that kills is a blocked urethra, and it does so fast. This guide explains the umbrella of feline lower urinary tract disease, why male cats face the deadly form, the signs that mean go now, and the honest state of the evidence on preventing it.

FLUTD is an umbrella, not one disease

Feline lower urinary tract disease, or FLUTD, is a term for several different problems that all produce the same set of signs in the bladder and urethra.1 The most common cause, especially in cats under about ten, is feline idiopathic cystitis (FIC), a stress-linked inflammation of the bladder with no infection behind it. It accounts for somewhere around 55 to 65 percent of cases in younger cats.4 Other causes include bladder stones, urethral plugs, and, less often in young cats, bacterial infection, which becomes more likely in older cats and those with kidney disease.1

Notably, true bacterial urinary infections are uncommon in young cats, which surprises owners who assume every "UTI" is an infection needing antibiotics. In a young cat, the cause is more often inflammation than bacteria.

The signs of FLUTD

All the causes funnel into a recognizable set of signs:1

  • Straining to urinate, and frequent trips producing only small amounts.
  • Blood in the urine.
  • Crying out or signs of pain while urinating.
  • Urinating outside the litter box, often on cool, smooth surfaces.
  • Excessive licking of the genital area.

These overlap with behavioral litter-box problems, which is part of why they get missed. The rule of thumb: a cat suddenly peeing outside the box may be telling you it hurts, not misbehaving, and it deserves a vet visit.

The emergency: a blocked cat

Here is the part every cat owner, and especially every male-cat owner, should know cold. When the urethra becomes completely blocked by a plug of crystals, mucus, and inflammatory debris, the cat cannot empty its bladder at all. This is a true medical emergency.2 Toxins and potassium build up in the blood, the kidneys begin to fail, and the rising potassium can stop the heart. Without treatment, a fully blocked cat can die in roughly 24 to 48 hours.1

It happens almost exclusively in male cats, because their urethra is longer and narrower and far easier to plug.1 The telltale sign is a cat straining repeatedly and producing little or no urine, often growing more distressed, restless, or vocal, and sometimes crying at the box. If you see that, do not wait until morning. Go to an emergency vet immediately.2

24–48 hours
how quickly a fully blocked male cat can die without treatment, from rising potassium and kidney failure

AVMA; Cornell Feline Health Center

How it is treated

For a blockage, the vet sedates the cat and passes a urinary catheter to relieve it, then treats the dangerous potassium and dehydration with IV fluids and keeps the cat in hospital, often for a few days, until things stabilize.1 For cats that keep blocking despite treatment, a surgery called a perineal urethrostomy (PU) widens the opening to make future blockages far less likely.2 Non-obstructed FLUTD is managed according to its cause: pain relief and supportive care for idiopathic cystitis, stone removal or dissolution for uroliths, antibiotics only when there is a real infection.

What it costs

Emergency unblocking with hospitalization commonly runs about $1,500 to $3,000 or more, and a perineal urethrostomy for a repeat-blocker is often in the range of $1,500 to $5,000.5 These are US market estimates that vary by region and severity. They are also a reminder that the cheap, boring prevention basics below are worth taking seriously.

Prevention, and an honest word on the evidence

For idiopathic cystitis, the bladder inflammation that drives most cases, the cornerstone of management is reducing stress and increasing water intake, often summarized as multimodal environmental modification: more and cleaner litter boxes, more water (including wet food and fountains), hiding spots, play, and a calm, predictable routine.1 Stress genuinely appears to trigger flares.2

Because this site does not oversell, here is the honest caveat. A 2025 systematic review found that the evidence base for many commonly recommended cystitis treatments is weak, with the strongest support sitting behind exactly those basics, environmental modification and a moisture-rich diet, rather than the many supplements and drugs often suggested.3 So the advice is to invest in water and a low-stress environment, and to be skeptical of products promising more than the science supports.

What to do this week

  1. If you have a male cat, memorize the emergency sign now: repeated straining with little or no urine means go to the vet immediately.
  2. Find and save your nearest 24-hour emergency vet's number before you ever need it.
  3. Boost water intake: add wet food, multiple water sources, and consider a fountain, since dilute urine is protective.
  4. Treat a cat that starts peeing outside the box as possibly sick, not bad, and book a vet visit rather than buying another cleaner.

Most cats with urinary disease are uncomfortable rather than in danger, and they do well with attention to water and stress. The exception is the blocked cat, and it is the one piece of cat-owner knowledge that is genuinely life-or-death. Learn that single sign, act on it without hesitation, and you take the deadliest version of this disease off the table.