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Urethral obstruction in male cats
Urethral obstruction is the blockage of the tube that carries urine from the bladder to the outside. Urine can no longer come out, the bladder fills without limit and waste accumulates in the blood. It affects almost exclusively the male, w...
What is it?
Urethral obstruction is the blockage of the tube that carries urine from the bladder to the outside. Urine can no longer come out, the bladder fills without limit and waste accumulates in the blood.
It affects almost exclusively the male, whose urethra is long and very narrow at its end.
It is a life-threatening emergency in the strict sense: without veterinary care, a stranded cat dies within one to two days. There is no action to take at home, no remedy to wait for, no reason to wait until the next day.
Key point
VITAL EMERGENCY. A male cat who is no longer able to urinate can die within twenty-four to forty-eight hours. There is no at-home treatment: go immediately to a veterinarian or emergency department.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The cat constantly returns to its litter box, squats, pushes, and nothing comes out.
He meows, moans or howls during exercise.
He licks his genital area frantically.
His stomach is tense and painful; the veterinarian feels a bladder as hard as a ball.
After a few hours: vomiting, total refusal of food, prostration.
Then: the cat remains lying on its side, breathes poorly, becomes cold, no longer reacts. At this point, every minute counts.
Beware of the classic trap: these efforts are very often mistaken for constipation. In a male who pushes without result, it is considered a urinary blockage until proven otherwise.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
A urethral plug, a mixture of mucus, crystals and inflammatory cells, which gets stuck in the thinnest part of the urethra.
A stone descended from the bladder and blocked along the way.
A spasm and swelling of the urethra caused by inflammation, particularly during idiopathic cystitis: the urethra then closes without any solid body being present.
More rarely: narrowing of the duct after old inflammation, tumor, after-effect of trauma.
Being a male, especially castrated: the urethra is narrower at its end.
Have already had episodes of cystitis or urinary problems.
Overweight, sedentary lifestyle, strict indoor life.
Exclusively dry diet and low water consumption.
Stress, multi-cat household, insufficient litter boxes.
History of obstruction: the risk of recurrence is high in the following weeks.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The diagnosis is quick: examining the stomach is often enough to identify a very distended and painful bladder in a cat that is no longer able to urinate.
A blood test measures kidney parameters and potassium levels, which can reach values dangerous for the heart.
An electrocardiogram is performed when the cat is very affected, because high potassium disrupts the heart rhythm.
An x-ray or ultrasound looks for stones and checks the integrity of the bladder.
These examinations do not delay treatment: stabilization begins immediately, in parallel.
Treatment
Treatment is provided in hospital and cannot be postponed.
An infusion is put in place to rehydrate, support the kidneys and correct blood abnormalities, particularly excess potassium.
The pain is treated as a priority because it is intense.
Under anesthesia or sedation, the veterinarian empties the bladder and unblocks the urethra by flushing it using a probe. A urinary catheter is then left in place for a few days until the inflammation subsides.
Medications from the urethral muscle relaxants and anti-inflammatories family are often combined during convalescence.
In cases of repeated blockages or damaged urethra, a surgery called perineal urethrostomy creates a wider opening: it removes the risk of mechanical blockage but does not cure the underlying urinary disease.
Never try to massage or squeeze your cat's stomach to make it urinate: you risk rupturing the bladder.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Treat the first urinary episode seriously, without waiting for it to repeat.
Increase water consumption: wet food, several water points, fountain if the cat likes it.
Follow the prescribed veterinary diet strictly after an episode.
Reduce stress and enrich the living environment: hiding places, heights, daily play, increased resources in multi-cat households.
One litter box per cat plus one, clean and in quiet places, to be able to monitor urine production.
Monitor the litter box of a male with a history every day: the absence of urine in the box should trigger a call to the veterinarian.
Maintain a healthy weight.
Possible complications
Excess potassium in the blood, which slows down and then destabilizes the heart: this is the main cause of death.
Acute renal failure, sometimes followed by lasting renal sequelae.
Rupture of the bladder, with diffusion of urine into the abdomen.
Recurrence in the days or weeks following the release: this is the period of greatest risk.
Urinary infection secondary to catheterization.
Scarring narrowing of the urethra after repeated blockages or catheterization.
When to see a veterinarian
Your male cat pushes to urinate without any drop coming out: go to a veterinarian immediately, day or night.
He meows or howls while trying to urinate.
His litter has been dry for more than half a day.
His stomach is hard and he refuses to be touched.
He vomits, no longer eats, hides or lies down without reacting.
It has already been blocked once and is now straining to urinate again.
Prognosis
A cat taken in early, before its general condition deteriorates, has a very good chance of recovering and returning to a normal life.
The prognosis quickly darkens with the delay: a cat already lying down, cold and hypothermic is in a critical situation.
Recurrences are frequent in the weeks following the release, hence the importance of monitoring and dietary measures.
After a perineal urethrostomy, the risk of mechanical blockage largely disappears, but episodes of cystitis may persist.
Frequently asked questions
My cat pushes in the litter box: is it constipation?
This is the most dangerous confusion. The two situations look very similar from the outside. In a male, you must assume that it is a urinary blockage and consult immediately: only a palpation of the stomach can make a decision.
Can I wait until tomorrow morning?
No. Blocked urine causes potassium to rise in the blood, which can stop the heart. A few hours can make the difference between a cat coming home and a cat not being rescued.
Can females get clogged?
It's very rare. Their urethra is shorter and wider. A female, on the other hand, can present all other urinary diseases, with identical signs: she must therefore also be examined.
Is surgery systematic?
No. Most cats are released by probing, without surgery. Perineal urethrostomy is reserved for recurring blockages or damaged urethras, and is discussed on a case-by-case basis with the veterinarian.
Will my cat return to normal afterwards?
Many cats return to completely normal lives. But the underlying urinary disease remains present: wet nutrition, hydration and stress reduction become measures to be taken over time, not just for a few weeks.
References
AAFP — American Association of Feline Practitioners
Content reviewed by the TunisieVet editorial team · Updated 09 August 2026
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