When to see a vet urgently
The cause of difficulty urinating cannot be confirmed at home, so seek urgent care if:
- your cat repeatedly tries to urinate but passes no urine;
- only drops come out and your cat seems painful;
- the abdomen is swollen or tender and your cat vomits or becomes lethargic;
- your cat cannot urinate again after a catheter is removed.
Overview
Normally, a cat's bladder fills with urine, then its wall contracts and the sphincter relaxes to allow urination. With atony, this coordination is disrupted: the bladder muscle loses its ability to contract, urine remains inside and the animal cannot empty its bladder properly. Stagnant urine predisposes to inflammation and infection and can even cause kidney damage.
The muscle that contracts the bladder wall is called the detrusor. Atony specifically means a loss of its contractile strength. Not every problem with coordination between the bladder and sphincter is therefore atony. Failure to urinate can also result from a blocked urethra or failure of the muscles controlling outflow to relax.
Obstruction and atony can be related but are not the same finding. Prolonged overstretching can damage bladder muscle function. The bladder may therefore not empty normally straight away even after the urethra has been unblocked. In this situation, substantial residual urine, meaning urine remaining after urination, may be left in the bladder.
Causes
Bladder atony in cats most often develops as a consequence of other diseases. Possible causes include:
- neurological disorders, including spinal cord injuries, spinal diseases and nervous system diseases,
- prolonged urethral obstruction from stones, mucus plugs or tumours,
- consequences of surgery or catheterisation,
- chronic bladder inflammation,
- weakening of muscle tissue in older cats.
The best-established mechanisms are damage to the nerves controlling the bladder and severe, prolonged overstretching. However, cystitis, ageing or previous catheterisation alone does not show that a cat has atony. If a cat does not urinate after surgery or catheter removal, pain, urethral spasm, a new obstruction and other possible complications are also investigated.
Risk factors
- male cats prone to urethral obstruction and urinary stones,
- animals with spinal injuries or neurological diseases,
- older cats with reduced tissue elasticity,
- cats that have undergone major urinary tract surgery.
Information about independent risk factors for atony in cats is limited. The narrower urethra of a male cat primarily increases obstruction risk, which can then cause overstretching. Age or assumed tissue elasticity alone is not enough to assess risk or make a diagnosis. The importance of a neurological disease depends on which part of the nervous system it damages.
Symptoms
You may notice the following signs:
- less frequent or difficult urination,
- incomplete bladder emptying,
- a full, enlarged bladder on palpation,
- urine dribbling, sometimes continuously,
- lethargy, loss of appetite and discomfort,
- signs of toxic effects and pain when complications develop.
Dribbling can be overflow incontinence: a full bladder leaks even though the cat cannot empty it voluntarily. Wet bedding or damp fur therefore does not guarantee adequate bladder emptying. However, urinary incontinence has other causes too, so drips alone do not establish atony.
The bladder is palpated during a veterinary examination. Do not try to establish its size by pressing hard on the abdomen or empty it by squeezing without individual instruction. First, it must be established whether urine can flow out at all. Adopting a urinating posture may also be mistaken for constipation when the problem is in the urinary tract.
Possible complications
Without treatment, bladder atony can lead to:
- chronic cystitis and urethritis,
- pyelonephritis, an infection of the kidney,
- hydronephrosis, enlargement of the kidney because urine accumulates,
- chronic kidney failure,
- toxic effects from metabolic waste products accumulating in the body.
The risk of consequences depends on the cause and duration of urine retention and concurrent diseases. The list does not mean every cat with atony develops chronic kidney failure. However, a complete urethral obstruction in particular can rapidly disrupt kidney function and blood electrolyte balance. The cat's overall condition may then deteriorate, and treatment must not wait for chronic consequences to appear.
Diagnosis at the vet
To make a diagnosis, the vet uses:
- a clinical examination and bladder palpation,
- ultrasound to assess the bladder's condition and filling,
- urine samples to identify infection or inflammation,
- a neurological examination if spinal cord damage is suspected,
- X-rays and other imaging when needed.
How is bladder emptying assessed?
The examination investigates how urination occurs, bladder size and any residual urine. The vet may compare bladder filling before and after an attempt to urinate. Ultrasound complements palpation and helps assess bladder contents and other urinary tract changes. If an outflow obstruction is suspected, stones, narrowing or another cause of blockage are investigated. A large bladder alone does not establish whether the muscle is weak or the urine's exit route is blocked.
A urine sample provides information about blood and inflammatory changes, for example, but culture may be needed to investigate bacterial infection. A catheter or its collection bag is not equivalent to a carefully collected diagnostic urine sample. A finding may indicate bacteria are present without a true infection. Blood tests assess kidney values and electrolytes, the body's salt balance, when needed.
Investigating a neurological cause
For a neurological problem, the hindlimbs, tail, anal muscle tone and local reflexes are also examined. The location of the injury affects bladder function: the bladder may be flaccid, or muscle tension at the outlet may make emptying difficult. Outwardly similar urinary symptoms may therefore need different treatments.
After an injury to the tail base or pelvis, control of urination and defecation is monitored separately. An obvious tail problem alone does not indicate bladder recovery. Imaging can investigate the injury, but an overall assessment of neurological signs also helps establish prognosis.
Treatment and follow-up
The first aim is to ensure urine can drain and prevent further overstretching. If the urethra is blocked, the vet relieves the obstruction. A poorly contracting bladder may then need temporary help with emptying, such as an indwelling catheter or repeated catheterisation. Treatment depends on the cat's condition and underlying cause. Pain is treated at the same time, along with dehydration and electrolyte disturbances when needed.
In some situations, the vet uses a medicine to support bladder contraction. This is considered only after confirming that the urethra is open. Treatment that contracts the bladder does not remove a mechanical obstruction. With nerve damage, the type of emptying disorder and the help needed during recovery must be assessed.
A catheter also carries risks of infection and tissue damage, so appropriate hygiene techniques are used and the ongoing need is reviewed. Catheter use alone does not mean every cat needs a precautionary antibiotic. If signs consistent with infection appear, investigations and medicine selection are planned according to the findings.
If your cat does not urinate after catheter removal, the cause is investigated again. Possible explanations include a new obstruction, continuing atony, pain or another functional problem. Stress in hospital can also affect urination, but must not be assumed to explain it without investigating dangerous causes. The treating vet determines whether discharge and the monitoring arrangements are safe.
Recovery at home and prognosis
At discharge, ask for precise instructions about the urination expected and which changes require action. Watch whether your cat produces a normal stream or only drops, how often it tries to urinate and whether bedding becomes wet. Report changes in hindleg or tail function and difficulty defecating too. These observations help assess a possible neurological problem.
If assisted bladder emptying is needed at home, the technique and safety precautions are taught separately for this cat's particular situation. Do not start on your own. Persistent urine wetness can irritate the skin; ask for coat and skin care instructions if the area becomes wet. Dribbling is not considered a sign of recovery without assessing bladder emptying.
The prognosis depends on the severity of overstretching or nerve damage and whether the bladder remains protected against further stretching. Muscle function does not always return immediately. In studies of cats with tail-base injuries, many patients regained urinary control, but more severe neurological signs were associated with poorer or slower recovery. An individual cat's prognosis cannot be inferred from the word atony alone.
Prevention
As bladder atony usually results from other diseases, prevention focuses on those conditions:
- prompt treatment of urinary stones and cystitis,
- preventing spinal injuries, particularly in outdoor cats,
- regular veterinary checks to monitor urinary tract health,
- watching for changes in urination-related behaviour.
The aim is to recognise urine retention early, rather than wait for visible bladder enlargement. In a cat that has already had an obstruction, recurrence risk is reduced through feeding and treatment suited to the underlying cause. Water intake, weight and everyday stress can be assessed as part of the plan, but these measures do not replace emptying a filling bladder.
Provide a quiet, easily accessible litter tray. If mobility is difficult, a low-sided tray makes access easier. Do not interpret changed litter tray behaviour as disobedience or punish accidents. Environmental changes alone cannot reliably prevent atony or urethral obstruction.
This text provides general information and does not replace veterinary care. If your cat develops symptoms, contact a vet.
Frequently asked questions
Can the bladder be full even when a cat dribbles urine?
Yes. With overflow incontinence, urine remains in the bladder and leaks out as it fills. Wet bedding therefore does not prove normal emptying. A cat trying to urinate but producing only drops needs urgent assessment.
Does atony resolve as soon as an obstruction is relieved?
Not necessarily. Overstretching can impair muscle function even after the obstruction is removed. The bladder may need temporary help with emptying and monitoring to prevent further stretching. Treatment duration depends on the return of function.
Can I squeeze my cat's bladder empty myself?
Do not start without a veterinary examination and personal instruction. Whether the method is suitable depends on factors including an open urethra and nervous system function. If urine cannot flow, take your cat for care rather than pressing its abdomen at home.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- 2025 iCatCare consensus guidelines on the diagnosis and management of lower urinary tract diseases in cats, International Cat Care / Journal of Feline Medicine and Surgery, accessed 2026-11-03.
- Disorders of Micturition in Dogs and Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Feline Lower Urinary Tract Disease, Cornell University, accessed 2026-11-03.
- Blocked Bladder in Cats, PDSA, accessed 2026-11-03.
- Evaluation of prognostic factors for return of urinary and defecatory function in cats with sacrocaudal luxation, Journal of Feline Medicine and Surgery / PubMed, accessed 2026-11-03.
- Noninfectious Diseases of the Urinary System of Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Feline Behaviour Problems: House Soiling, Cornell University, accessed 2026-11-03.