Medical Oncologist
Kidney and fluid emergency
Not Passing Urine or Sudden Swelling — Go to Emergency Now
Not passing urine, or suddenly swelling all over, during cancer treatment is a medical emergency until proven otherwise. These symptoms can mean your kidneys have stopped filtering or your heart is under strain — both need urgent assessment today, not tomorrow.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Do not wait for your next appointment — If you have passed little or no urine for several hours, or swelling appeared suddenly all over, go to emergency today.
- Kidneys and heart can both be affected — Some cancer treatments can injure the kidneys directly or strain the heart. Both cause dangerous fluid changes that need immediate care.
- Tell them you are on cancer treatment — Say which drug or treatment you are on. It changes which tests the emergency team runs first.
- Early treatment changes outcomes — Kidney injury and cardiac fluid buildup are manageable when caught quickly. Every hour matters.
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Not passing urine or sudden whole-body swelling during cancer treatment are signs your kidneys may have stopped filtering, or fluid is building from heart strain — both need emergency assessment today. Do not wait. Go to your nearest emergency department now, or call your oncology helpline immediately. Tell them you are on cancer treatment.
If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.
Why can cancer treatment cause you to stop passing urine or swell suddenly?
Some chemotherapy drugs can injure the kidney's filtering units directly. When the kidneys stop filtering, waste products build up quickly in the blood and fluid accumulates throughout the body.
Some treatments also strain the heart, causing fluid to back up into body tissues — and a tumour pressing on a ureter or the bladder outlet can block urine from draining even when the kidneys themselves are still working. Either way, the pressure builds within hours.
You cannot tell at home which of these is happening. The emergency team can check with blood tests, a bladder scan and a heart tracing within the hour — which is why going now, not tomorrow, changes what treatment is possible.
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17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Interventional Radiologist
Dr. Mohammed Imran
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
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Not sure whether this counts as an emergency?
Call the helpline. It is always better to check than to wait.
How do you know whether to call your team or go straight to emergency?
| What you notice | Call your oncology team today | Go to emergency now |
|---|---|---|
| Urine output | Noticeably less than usual, but still passing some | Little or none for several hours |
| Swelling | Mild ankle or leg swelling, gradual over days | Sudden, spreading, or involving face and whole body |
| Breathlessness | Mild and only when walking or active | Present at rest, or cannot lie flat without feeling breathless |
| Other symptoms | Nausea, reduced appetite, feeling tired | Chest pain, racing heart, confusion, or feeling faint |
| Typically starts | Days to weeks after a new treatment or dose change | Can appear suddenly at any point during treatment |
What to do right now, and what to tell the emergency team
- Go to the nearest emergency department — do not drive yourself if you feel breathless, faint or confused.
- Bring your treatment summary or write down the name of your chemotherapy drug before you leave.
- Tell the emergency team immediately that you are on cancer treatment — say which drug if you know it.
- Tell them when you last passed urine and roughly when the swelling began.
- Do not take extra fluids or diuretics (water tablets) before being assessed — the cause is not yet known.
- Ask someone with you to call your CION oncology helpline from the waiting room so they can speak directly to the emergency doctor.
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Common questions
Frequently asked questions
Could the swelling just be from the drip fluids I was given during treatment?
Mild swelling around a cannula site or in the arms after fluids is common and usually settles within a day. Sudden swelling that spreads across your body, reaches your face, or comes with breathlessness is different and needs emergency assessment. The safe question to ask yourself is: is this spreading, and am I breathless? If the answer to either is yes, go to emergency today rather than waiting to see.
I passed urine this morning but nothing since — do I still need to go?
Yes, if several hours have passed with no output, or what you passed this morning was very dark or much less than usual. The change in pattern matters as much as the total amount. If you also feel bloated and swollen, tell your oncology team today — do not wait for your next appointment. If breathlessness, chest pain or confusion are also present, go to emergency now rather than calling first.
Does this mean my cancer treatment has stopped working?
Not usually. Not passing urine or sudden swelling is more often a sign that the kidneys or heart are reacting to treatment — which is a separate question from whether the cancer itself is responding. Most kidney injuries caused by chemotherapy are reversible with prompt treatment. Your team will stabilise the kidney or fluid problem first, then review the treatment plan once you are safely past the immediate crisis.
What will the emergency team do when I arrive?
They will check your blood pressure, heart rate and oxygen level immediately. Blood tests will show how well your kidneys are filtering and whether waste products are building up. A quick ultrasound scan will check how much urine is in your bladder — this takes only a few minutes. If there is a blockage, they can drain the bladder right away. If the kidneys are injured, they will give carefully managed fluids and involve a kidney specialist. Tell the team you are on cancer treatment the moment you walk in — it speeds up every step.