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CION Cancer Clinics
Bladder problems after rectal surgery | CION Cancer Clinics
The nerves that tell the bladder when to empty run along the outside of the rectum, so removing the rectum can bruise them. The commonest result is a bladder that does not empty fully in the first weeks, sometimes with leaking or infection. For most people this settles over weeks to months as the nerves recover. This page explains what to expect, what helps, and the two situations that need same-day care. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- Why does the bladder play up after rectal surgery?
- The four bladder problems, and what each one means
- What helps the bladder recover?
- What the words on the ward mean
- What families assume about the bladder, and what is true
- Who is more at risk, and what this page cannot tell you
- Common questions about the bladder after rectal surgery
The short answer
Why does the bladder play up after rectal surgery?
The nerves that tell the bladder when to empty run along the outside of the rectum, so removing the rectum can bruise them. The commonest result is a bladder that does not empty fully in the first weeks. For most people this settles over weeks to months as the nerves recover.
What the bladder needs and what the operation disturbs
Emptying the bladder needs two things to happen together: the bladder muscle squeezes and the outlet relaxes. Both are run by the same pelvic nerves that a surgeon works beside while freeing the rectum. Bruise them and the squeeze becomes weak, so urine is left behind. Cut them, which is sometimes unavoidable when the cancer sits against them, and the effect can last.
Why it shows up when the catheter comes out
During and after the operation a tube drains the bladder, so nothing is noticed. The problem appears on the day the tube is removed, when the bladder has to work on its own. That is why the ward checks how much urine is left after you pass water, and why the tube sometimes goes back in for a few more days.
Radiotherapy before surgery adds to the bruising and makes a slow recovery more likely.What people notice
The four bladder problems, and what each one means
Not emptying fully
The commonest problem. A slow stream, having to strain, a feeling that some is still there, and needing to go again soon after. Urine left behind gets infected easily, which is why it matters.
Leaking
Often a full bladder overflowing rather than a weak outlet. Dribbling after passing water, or a wet pad without ever feeling the urge, points to a bladder that is not emptying. Coughing and sneezing leaks are less common after this operation.
Urgency and going often
A bladder that has been irritated by the catheter or an infection signals early and often. This usually settles once the infection is treated and the lining calms down.
Makes it worse
- Tea, coffee and fizzy drinks
- Drinking very little to avoid the toilet
- An untreated infection
Infection
Burning, cloudy or smelly urine, and sometimes blood in the urine. Common after a catheter and more likely when the bladder is not emptying. It is treated with antibiotics, but the reason it happened also needs fixing.
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Two things that cannot wait
If no urine has passed for many hours and the lower belly is swollen, tight or painful, the bladder is blocked and needs a catheter the same day. Go to the nearest emergency department and say you had rectal surgery. The same applies to fever with shivering and burning urine, which may be an infection spreading to the kidney. Do not wait until morning and do not drink more to "flush it out".
Getting it working
What helps the bladder recover?
Go by the clock, not the urge
A bruised bladder signals late. Pass water at set times through the day whether or not you feel the need. It prevents overfilling, which stretches the muscle and makes the weakness worse.
Sit, relax and go twice
Men often empty better sitting down after this operation. Take your time, breathe out, and do not strain. When you think you have finished, wait a short while and try again. Double voiding clears the urine that a weak squeeze leaves behind.
Drink normally
Cutting fluids to reduce toilet trips concentrates the urine and invites infection. Spread drinks through the day and ease off in the evening. Tea, coffee and fizzy drinks irritate a sore bladder.
Medicines and a catheter you manage yourself
Tamsulosin (Urimax, Flodart) relaxes the outlet and helps some men empty. Your doctor decides whether it suits you and sets the amount. If the bladder still leaves a lot behind, a nurse can teach you to pass a small tube yourself a few times a day. Most people who learn this need it for a limited time only.
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Words you will hear
What the words on the ward mean
- Retention
- Urine staying in the bladder because it cannot be passed. Acute retention means none at all, which is an emergency.
- Residual volume
- How much urine is left after you pass water, measured with a small scanner on the belly. This is the number the team uses to decide whether the catheter can stay out.
- Trial without catheter
- Taking the tube out and checking over a few hours whether you can pass water and empty. If not, the tube goes back for a while.
- Intermittent self-catheterisation
- Passing a small, single-use tube yourself to empty the bladder, then removing it. Taught by a nurse, and easier than most people expect.
- Urodynamics
- A test that measures bladder pressure and flow, used if problems last and the urologist needs to know exactly what is failing.
Commonly believed
What families assume about the bladder, and what is true
"If he drinks less, the bladder will trouble him less."
Strong, concentrated urine irritates the bladder and feeds infection, and a dehydrated person after bowel surgery is at real risk. Normal drinking spread through the day is safer. The problem is emptying, not the amount going in.
"Going home with a catheter means something went wrong."
It means the bladder needs a little longer, which is common after rectal surgery and expected after radiotherapy. A second trial without the catheter a week or two later succeeds for most people. It is a delay, not a complication.
"Self-catheterising is only for people who are paralysed."
It is used by many people with an ordinary bladder that is slow to recover, and for most it is temporary. It prevents infections and protects the kidneys while the nerves heal. A nurse teaches it in one or two sessions.
"Bladder trouble is a small thing next to the cancer."
Left alone it causes repeated infections, kidney damage and sleepless nights, and it is one of the most fixable problems on this whole journey. Mention it at every follow-up until it is sorted.
Being straight with you
Who is more at risk, and what this page cannot tell you
Bladder problems last longer where the nerves had to be removed with the cancer, where the whole rectum and anus were taken, and where radiotherapy was given first. Men with an enlarged prostate, people with diabetes and older patients also recover more slowly, because their bladders were already working harder before the operation.
What to tell the team before the operation
Say if you already get up at night to pass water, if your stream is slow, if you have had a urine infection recently or if you take any tablets for the prostate or the bladder. Each of these changes how the team manages the catheter afterwards.
What this page cannot tell you
It cannot tell you whether your own nerves were bruised or cut, or how long your bladder will take. Only your surgeon, who knows what was done in the pelvis, can say that. It is not a reason to start or stop any tablet on your own. A bladder still not emptying after months needs a urologist, not more patience.
Questions we are asked
Common questions about the bladder after rectal surgery
How long will bladder problems last?
For most people, weeks to a few months, with the first improvement soon after the catheter comes out for good. Where nerves were cut or radiotherapy was given, it can take longer, and a small number of people need ongoing help with emptying. Your surgeon can say which group you are likely to be in.
Why was my father sent home with the catheter still in?
Because when it was taken out on the ward, too much urine was left behind. Sending him home with it is safer than letting the bladder overfill. It will be tried again at a clinic visit after a week or two, and most people pass that second trial.
Is it normal to leak a little after passing water?
Early on, yes, and it usually means the bladder is not emptying fully rather than that the outlet is weak. Sitting to pass water, taking time and going twice help. If it continues, ask for a scan of the residual volume, because an overfull bladder needs a different fix from a weak outlet.
Does the same nerve damage affect sex?
Often, because the bladder and the sexual organs share the same pelvic nerves. Someone with slow bladder recovery is more likely to have erection or dryness problems too, and both tend to improve together. It is worth raising the two things at the same visit.
Can I take tamsulosin that the chemist suggests?
Only if your doctor has prescribed it. It lowers blood pressure and can cause dizziness in someone still weak after surgery, and it helps some bladders and not others. Ask the surgeon or a urologist rather than buying it.
How do I know if I have a urine infection?
Burning, cloudy or smelly urine, needing to go very often, pain low in the belly, or blood in the urine. A simple urine test confirms it. With fever and shivering, or pain in the back over the kidney, go the same day, because an infection can spread quickly when the bladder is not emptying.
Are pads or a self-catheter covered by insurance?
Catheters and nursing during the admission are usually within the surgery package, and follow-up visits are generally covered under Aarogyasri, CGHS, ECHS, EHS and cashless insurance. Pads and self-catheter supplies at home are usually paid for by the family.
Who do I contact at CION if it is not settling?
Call the helpline and say you had rectal surgery and the bladder is not emptying or is leaking. You will be directed to your surgeon's team, and to a urologist if needed. Bring a note of how often you pass water and any leaks or infections since the operation.
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Sources
- American Cancer Society — Surgery for rectal cancer
- Cancer Research UK — Bowel cancer: surgery
- NHS — Urinary retention
- NHS — Urinary tract infections (UTIs)
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Sexual Function After Rectal Surgery in MenThe same nerves, so the problems often go togetherSexual Function After Rectal Surgery in WomenDryness and sensation share the same nerve supplyDrains, Tubes, Lines and CathetersWhat the urinary catheter is for and when it comes outComplications and Red FlagsEvery sign after surgery that needs same-day careRadiation Before Rectal Surgery: How It Changes ThingsWhy bladder recovery is slower after pelvic radiotherapy
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Bladder still not settling after surgery?
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