Sudden Inability to Pass Urine: Reversible Causes, and Why It Cannot Wait

آخر تحديث: 29 أغسطس 2026

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If you cannot pass urine right now

Go to hospital today. A bladder that cannot empty is painful, it does not resolve by waiting, and prolonged obstruction damages the kidneys. Drainage with a catheter relieves it within minutes, and everything else on this page — working out why it happened — comes afterwards.

An earlier version of this article discussed reversible causes at length without saying this anywhere. In an emergency in Thailand, call 1669.

• مركز مسالك البولية مست شفي بانكوك تايلاند احجز عبر الانترنت 02-310-3009 bhquro@bdms.co.th
• مستشفي ساميتيويت انش تشونبوري 088-022-1445

Why finding the trigger matters

In men, the background cause is usually a prostate that has been gradually obstructing for years — see زيادة حجم البروستاتا الحميدة. But a prostate that has been slowly enlarging for a decade does not suddenly stop working on a Tuesday. Something usually tips it over, and that something is often correctable.

This matters practically. Where a clear trigger is found and removed, many men pass urine normally after the catheter comes out and need nothing further. Where no trigger is found, retention is more likely to recur and the underlying obstruction usually needs treating. The fuller account of the causes themselves is in acute urinary retention in men.

The correctable triggers

Medicines — the commonest, and the most avoidable

• Cold and flu remedies containing a decongestant such as pseudoephedrine or phenylephrine. These tighten the bladder outlet, and in a man with an enlarged prostate they are a classic precipitant of a first episode of retention. This was missing from the earlier version of this article entirely, and it is the one worth knowing about, because these are bought without a prescription by men who have no idea they carry the risk.
• Antihistamines, particularly the older sedating type found in the same cold remedies — they relax the bladder muscle.
• Anticholinergic drugs, including bladder medicines for an overactive bladder, some drugs for nausea and vertigo, and some for Parkinson’s disease.
• Opioid painkillers, and anaesthesia — retention after an operation is common enough to be routine.
• Tricyclic antidepressants and some other psychiatric medicines.
• A heavy episode of alcohol, which fills the bladder quickly while blunting the reflex to empty it.

Two corrections here. The earlier version listed antihypertensives و NSAIDs among the causes; neither is a well-established precipitant of retention, and both have been removed. Decongestants, antihistamines and anticholinergics — the ones that genuinely matter — were largely absent.

إمساك

A loaded rectum presses on the bladder outlet, and clearing it sometimes resolves the retention on its own. Easily missed, easily fixed, and worth asking about in anyone who is immobile or on opioids — both of which cause constipation and retention at the same time.

Infection and inflammation

التهاب البروستاتا in particular can cause retention outright, and any urinary infection can tip a marginal bladder over. Fever with retention needs urgent attention rather than a routine appointment.

Being unwell, immobile, or recently operated on

Bed rest, a general anaesthetic, post-operative pain relief and an unfamiliar environment combine, which is why retention is so common in hospital. It is also why the episode that happens in hospital does not always mean the prostate needs treating.

The checklist used in clinic: DIAPPERS

To make sure none of the above is missed, the reversible contributors are worked through as a checklist using the mnemonic حفاضات. It comes originally from the assessment of transient urinary سلس البول, and it is used here in the same spirit — as a systematic sweep for the reversible things that tip a marginal bladder over, so that none is overlooked in a patient who is uncomfortable and being dealt with quickly.

What happens after the catheter goes in

• The volume drained is recorded. A very large volume suggests the bladder had been struggling for a long time rather than failing suddenly — but it is worth knowing that there is no agreed volume above which retention counts as chronic. The formal definitions use the urine left بعد passing water rather than what comes out through the first catheter, and even those differ between guidelines: one uses more than 300 ml on at least two occasions over six months, another sets the mark at a litre. Kidney function, whether the kidneys are swollen on a scan, and repeated infections predict how things go better than the drainage figure does.
• Kidney function is checked, since obstruction affects it.
• Occasionally the kidneys produce a great deal of urine for a day or two afterwards. This is post-obstructive diuresis, usually defined as more than 200 ml an hour for two hours running, or more than three litres in a day. In most men it settles within about 24 hours and needs only watching. Beyond about 48 hours it becomes a problem in itself, because losing that much fluid and salt can drop the blood pressure and disturb the body’s chemistry — which is a legitimate reason to be kept in on fluids and blood tests rather than sent home with a bag. The heaviest diuresis generally happens only when both kidneys, or a single functioning kidney, were completely obstructed.
• A medication to relax the outlet is usually started before the catheter is removed, and it makes a measurable difference: pooled trial data show roughly 60% من الرجال يمرون بغزارة البول بنجاح بعد خروج القسطرة عند تناول مادة من نوع ألفا-بلاكوسيد، مقابل حوالي 38% من الرجال دون تناول هذه المادة., and it also reduces the chance of going back into retention afterwards. It is one of the better-supported small interventions in urology, and reasonable to ask about if nobody has mentioned it.
• The catheter is removed after a few days and you are watched to see whether you can void. If that fails, it is repeated later or the underlying obstruction is treated — see علاج بخار الماء and the other options for an obstructing prostate.

One caution worth stating, because it is the reason assessment matters more than the choice of treatment: a weak or underactive bladder produces the same picture as an obstructed outlet, and operating on the prostate of a man whose bladder is the real problem does not help him. That distinction is made on اختبار التدفق وبالإضافة إلى ذلك، وفي الحالات التي تقتضيها الضرورة، دراسات الضغط.

أراضٍ تستدعي الانتباه في نفس اليوم

• عدم القدرة على التبول على الإطلاق, with a painful full lower abdomen.
• حمى أو قشعريرة إلى جانب صعوبة التبول.
• Passing only small amounts frequently, with constant dribbling — this can be a full bladder overflowing rather than an improvement, and it is easily mistaken for the opposite problem.
• New leg weakness or numbness, numbness around the buttocks or genitals, or loss of bowel control alongside retention. This suggests pressure on the nerves of the spine and is an emergency measured in hours.
• A catheter that stops draining.

الأسئلة المتكررة

I cannot pass urine. Can it wait until tomorrow?

No. It is painful, it will not resolve by itself, and prolonged obstruction damages the kidneys. Drainage with a catheter relieves it within minutes. Investigating why it happened comes afterwards.

Which medicines can bring it on?

Decongestants in cold and flu remedies are the classic trigger and are bought without a prescription. Also older antihistamines, anticholinergic drugs including some bladder and anti-nausea medicines, opioid painkillers, anaesthesia, tricyclic antidepressants, and a heavy episode of drinking. If you have an enlarged prostate, check cold remedies before taking them.

Does a medication before the catheter comes out actually help?

Yes, measurably. Pooled trial data show that with an alpha-blocker started before the catheter is removed, roughly 60% of men pass urine successfully, against roughly 38% without one, and it also reduces the chance of going back into retention. It is reasonable to ask about if it has not been mentioned.

They drained a huge amount. Does the number mean it is serious?

Only loosely. A large volume suggests the bladder had been struggling for a while rather than failing suddenly, but there is no agreed volume that makes retention officially chronic. The formal definitions use the residual left after voiding rather than the first drainage, and they differ between guidelines — one uses more than 300 ml on two occasions over six months, another a litre. Kidney function, swelling of the kidneys on imaging and repeated infections tell you more than the drainage figure.

Will I need a prostate operation?

Not necessarily. Where a clear trigger is found and removed — a medicine, constipation, an infection, an operation — many men pass urine normally once the catheter comes out and need nothing further. Where no trigger is found, retention tends to recur and the underlying obstruction usually needs treating.

I am dribbling constantly. Does that mean the blockage has cleared?

Not necessarily, and this catches people out. A very full bladder can overflow, producing constant dribbling that looks like incontinence while the bladder remains obstructed. It needs assessment rather than reassurance.

Does this happen to women?

Much less often, since there is no prostate. When it does, the causes are different — neurological conditions, pelvic surgery, prolapse, medication, or a bladder that has become underactive — and it warrants proper investigation rather than being assumed transient.

ترتيب استشارة

After an episode of retention, Dr. Soarawee Weerasopone sees patients at مقر مستشفى بانكوك وفي مستشفى سامิติج سريراشا في تشونبوري في 088-022-1445. احضر قائمة كل شيء خذ، بما في ذلك العلاجات الباردة وأي شيء تم شرائه دون وصفة طبية، وقم بتسجيل مقدار السائل الذي تم استنزافه إن كان لديك ذلك.

تتوفر خدمة الرعاية الصحية عن بعد من مستشفى بانكوك للمرضى غير القادرين على الحضور شخصياً، بما في ذلك المرضى الدوليين - يرجى ترتيب ذلك مسبقاً عن طريق البريد الإلكتروني مع قسم المسالك البولية على bhquro@bdms.co.th. مستشفى ساميتيفيج سيراتشا يقدم الخدمات حضورياً فقط. يتم الرد على الاستفسارات المتعلقة بالتكلفة من قبل المستشفى وليس من خلال هذا الموقع الإلكتروني. إذا لم تتمكن من التبول الآن، فاذهب إلى المستشفى بدلاً من إرسال رسالة عبر البريد الإلكتروني.

المراجع

• فيشر إي، سبرامونيان ك. عمر م. دور مضادات التباطؤ في إزالة القسطرة الشريانية عند حدوث انقطاع مؤقت في البول لدى الرجال. قاعدة بيانات كوكريان للبحوث السريرية. 2014؛(6):CD006744.
• كارافيتاسيكس م، كيرياسيس إي، عمر م. إي، وآخرون. إدارة اضطراب الإفراز البولي لدى المرضى المصابين بأمراض الانسداد البروستاتي الحميدة: استعراض منهجي وتحليل مقارن. Eur Urol. 2019;75(5):788–798.
• Stoffel JT, Peterson AC, Sandhu JS, et al. AUA white paper on nonneurogenic chronic urinary retention. J Urol. 2017;198(1):153–160.

إخلاء مسؤولية: تم كتابة هذا المحتوى ومراجعته من قبل الدكتور صواراوي فيراسوبون، وهو أخصائي مسالك بولية معتمد من البورد في المقر الرئيسي لمستشفي بانكوك، وهو مخصص للغرض التعليمي فقط. ولا يُعد نصيحة طبية أو تشخيصاً أو وصفة لأي فرد، كما لا يتم تقديم أي نصيحة أو تشخيص أو وصفة طبية من خلال قنوات الرسائل الشخصية أو وسائل التواصل الاجتماعي. لا يدير الدكتور صواراوي أي حساب عام على وسائل التواصل الاجتماعي؛ وأي حساب يقدم استشارة خاصة باسمه هو حساب احتيالي. في حالة الطوارئ في تايلاند، اتصل بـ 1669.