Can a female cat get a urinary blockage too?

It is far less common than in male cats because of their wider urethra, but female cats can still develop painful, urgent urinary problems such as cystitis. Any cat straining to urinate or unable to go should be seen by a vet promptly regardless of sex.

My cat is weeing very small amounts often — is that the same emergency?

It can still be serious and should be treated with the same urgency as a cat producing nothing at all, since small, frequent, straining attempts can indicate a partial blockage or painful inflammation. Ring your vet now rather than waiting to see if it worsens.

How quickly can a blocked bladder become dangerous in a cat?

It can become life-threatening within a day or two as toxins that should be removed in urine build up in the bloodstream instead. This is why any cat unable to urinate needs to be seen the same day, not left overnight to see if it resolves.

What causes cats to stop being able to wee?

Crystals, bladder stones, inflammation, or a plug of debris in the urethra are common causes, and stress is also linked to flare-ups in some cats. A vet examination and often further tests are needed to find the specific cause in your cat.

My cat isn't weeing — this can be an emergency

A cat who is straining in the litter tray with little or nothing coming out, or who has not weed at all in over a day, needs a vet immediately, not in the morning. This is especially urgent in male cats, who can develop a life-threatening blockage. Ring your vet now, or an out-of-hours service if they are closed, and say a cat cannot pass urine.

Emergency — ring a vet now

This is a sign that needs a vet straight away, not later today. Ring your practice, or an out-of-hours service if they are closed, and describe what you are seeing.

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Do this now

Ring the vet before anything else, and be clear on the phone that your cat cannot urinate or is straining without producing anything, since this is treated as urgent. If your own practice is closed, their answerphone will normally direct you to an out-of-hours service.

Keep your cat somewhere calm and quiet while you arrange to get them seen, and do not wait to see if it resolves on its own. A blocked bladder gets more dangerous the longer it continues, as pressure and toxins build up in the body.

Do not attempt to press on your cat's abdomen or bladder area at home, and do not give any human medication or home remedy. There is nothing safe to do at home for this beyond keeping your cat calm and getting them to a vet.

What to tell the vet

Say clearly whether your cat is straining repeatedly with nothing coming out, passing only small drops, or has not attempted to urinate at all, since these details help the vet judge urgency before you even arrive. Mention how long it has been since you last saw them wee normally.

Note whether your cat is male or female if you are asked, since male cats are at much higher risk of a complete blockage because of their narrower urethra, which is one of the reasons this particular symptom is treated so seriously.

Mention any other changes too: vocalising in the tray, repeated visits without producing urine, blood in the litter, vomiting, or a cat who seems withdrawn, off their food or generally unwell. Any of these alongside difficulty weeing raises the urgency further.

Why this is treated as an emergency

A blocked bladder, most commonly from crystals, stones, inflammation or a plug of debris in the urethra, stops a cat passing urine at all in the most severe cases. Toxins that would normally be removed in urine build up in the bloodstream instead, and left untreated this can become fatal within a day or two.

Male cats are at particular risk because their urethra is narrower than a female cat's, making a full blockage far more likely, which is why any male cat straining to urinate is treated as an emergency rather than watched at home.

Even when the underlying cause turns out to be less severe, such as cystitis without a full blockage, the symptoms can look identical at home, so the safe approach is always the same: treat any cat who cannot wee normally as urgent until a vet has examined them.

Afterwards

Expect the vet to want to examine your cat and likely run tests, such as imaging or a urine sample, to find the specific cause once any immediate blockage has been dealt with, since the underlying reason needs identifying to prevent it happening again.

Many cats who have had one blocked or difficult episode are more prone to it recurring, so your vet may talk to you about diet, hydration and environment changes afterwards as part of managing that risk going forward.

Reducing the chance of it happening again

Fresh water available in more than one place around the home, and a wet food alongside or instead of a fully dry diet, both encourage a cat to take in more fluid overall, which supports healthier urine and can lower the risk of the crystals and debris behind many blockages.

Keeping litter trays clean, in a quiet, easily reached spot, and providing at least one tray per cat plus one extra, reduces the chance a cat holds on rather than going, since some cats will avoid a tray they find unpleasant, which is its own contributor to urinary problems over time.

Stress reduction matters more than it might seem: cystitis flare-ups in particular are linked to stress in some cats, so keeping routines predictable and giving a cat safe, quiet spaces to retreat to is a genuine part of managing the risk, not just a comfort measure.

Common questions

Can a female cat get a urinary blockage too?: It is far less common than in male cats because of their wider urethra, but female cats can still develop painful, urgent urinary problems such as cystitis. Any cat straining to urinate or unable to go should be seen by a vet promptly regardless of sex.
My cat is weeing very small amounts often — is that the same emergency?: It can still be serious and should be treated with the same urgency as a cat producing nothing at all, since small, frequent, straining attempts can indicate a partial blockage or painful inflammation. Ring your vet now rather than waiting to see if it worsens.
How quickly can a blocked bladder become dangerous in a cat?: It can become life-threatening within a day or two as toxins that should be removed in urine build up in the bloodstream instead. This is why any cat unable to urinate needs to be seen the same day, not left overnight to see if it resolves.
What causes cats to stop being able to wee?: Crystals, bladder stones, inflammation, or a plug of debris in the urethra are common causes, and stress is also linked to flare-ups in some cats. A vet examination and often further tests are needed to find the specific cause in your cat.

Sources

Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.

Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.