Not Passing Urine or — Passing Very Little
Very little or no urine during chemotherapy is not a symptom to watch and wait. It can mean your kidneys are under serious stress, and that needs to be assessed the same day.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- Act the same day — Do not wait for your next scheduled visit. Call your oncology team now.
- Several causes — Some chemotherapy drugs directly stress the kidneys. Severe vomiting and diarrhoea can also reduce kidney blood flow.
- Blood tests will show what is happening — Your team can check kidney function quickly and decide what is needed.
- Treatable when found early — Kidney injury caught early is far easier to manage than the same injury found a day later.
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Passing little or no urine during chemotherapy can be a sign of acute kidney injury, which needs same-day assessment. Some chemotherapy drugs stress the kidneys directly. Severe vomiting or diarrhoea can also reduce kidney blood flow. Do not wait — call your oncology team today.
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 does urine output drop during chemotherapy?
Several chemotherapy drugs are known to stress the kidneys, and some require extra fluids given through a drip before each dose to protect against this. If kidney function drops, one of the first signs is a change in how much urine you pass.
Severe nausea, vomiting or diarrhoea can also reduce the amount of fluid reaching the kidneys, which then produce less urine as a result. This is a different cause but needs the same urgent response.
Less commonly, a tumour or enlarged lymph nodes can press on the urinary tract and block the flow of urine out of the body. Your team will want to rule this out quickly.
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Not sure whether this counts as an emergency?
Call the helpline. It is always better to check than to wait.
What to tell your team when you call
- When you last passed urine and roughly how much
- Whether your urine looks darker than usual
- How much you have been able to drink in the last 24 hours
- Whether you have had vomiting, diarrhoea or fever
- Whether your legs, feet or face look swollen
- Which chemotherapy you are on and when your last cycle was
How do you know if your urine output has changed enough to act?
| Feature | Normal | Call your team today | Go to emergency now |
|---|---|---|---|
| Urine frequency | Passing urine regularly throughout the day | Noticeably less than your usual pattern | No urine at all for several hours |
| Urine colour | Pale yellow to yellow | Dark yellow or amber | Dark brown or colour of tea |
| Swelling | None | Mild swelling in ankles or feet | Swelling in legs, face or hands |
| Other symptoms | None | Feeling more tired than usual | Confusion, chest pain or difficulty breathing |
| Typically starts | — | Any time during or shortly after a chemotherapy cycle | Can develop within hours of a nephrotoxic drug |
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Frequently asked questions
Which chemotherapy drugs are hardest on the kidneys?
Several chemotherapy drugs are known to be nephrotoxic, meaning they can stress or damage the kidneys, and your oncology team will usually give extra precautions — such as intravenous fluids before each dose — when these are used. NCCN and ASCO guidance flags cisplatin and ifosfamide as drugs requiring particular kidney monitoring. Ask your oncologist which drugs are in your regimen and what monitoring is planned, rather than waiting to notice a symptom.
Can I drink more water to fix low urine output at home?
Drinking fluids can help if mild dehydration is the only cause, but do not try to manage this at home without speaking to your team first. If the cause is kidney injury rather than dehydration alone, extra fluids at home will not reverse it and will delay the assessment that can. Call your team and describe the change. They will tell you whether to come in or whether drinking more is the right first step.
Will reduced urine output mean my chemotherapy has to stop?
Not necessarily. Chemotherapy doses are often calculated based on how well the kidneys are working, so a change in kidney function may affect the dose rather than stopping treatment altogether. The decision depends on how significant the change is and how quickly it responds to treatment. Reporting early is what keeps the milder options available — waiting makes the decision harder, not easier.
What will happen when I go to hospital or call the oncology team?
Your team will ask about your urine output, fluid intake, any swelling, and other symptoms. Blood tests to check kidney function and electrolytes will almost certainly be done the same day. If the results show kidney stress, you may be given fluids through a drip and kept in for monitoring. The aim is to find the cause quickly and act before the injury progresses.
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