Patient education
Onconephrology
Onconephrology is the field where kidney care and cancer care meet. Cancer itself — and many of its treatments — can affect the kidneys, and people with kidney disease often need their cancer treatment carefully adjusted.
The basics
Why do cancer and kidneys intersect?
The kidneys filter the blood — which means they are exposed to cancer cells' by-products and nearly every medicine used in treatment.
Chemotherapy can be directly toxic to kidneys
Newer targeted and immune therapies affect kidneys too
Some cancers release proteins that damage kidneys
Dehydration from vomiting or diarrhoea strains kidneys
Tumours can block urine flow
Existing kidney disease changes cancer drug dosing
Common situations
When is an onconephrologist involved?
A kidney specialist works alongside your oncologist in several common situations during the cancer journey.
Acute kidney injury during treatment
A sudden rise in creatinine during chemotherapy, immunotherapy or severe infection. Quick identification often allows treatment to continue safely.
Blood cancers affecting the kidneys
Multiple myeloma and some lymphomas produce proteins that can clog or damage kidney filters. Treating the cancer and protecting the kidneys go hand in hand.
Drug dosing in kidney disease
Many cancer medicines are cleared by the kidneys. Impaired kidney function means doses must be adjusted — too much causes toxicity, too little reduces effectiveness.
Electrolyte disturbances
Cancer and its treatment can disturb sodium, potassium, calcium and phosphate — sometimes seriously. Specialist management keeps these in safe range.
After kidney removal or donation
People living with one kidney — after cancer surgery or transplant — benefit from long-term kidney monitoring and protection.
Kidney disease in cancer survivors
Some kidney effects appear months or years after treatment finishes. Survivorship care includes periodic kidney checks.
What to expect
How kidney care fits into cancer treatment
The goal is always the same: allow your cancer treatment to proceed as effectively and safely as possible.
- 01
Baseline assessment
Before treatment starts, kidney function is measured with blood and urine tests so any later change is detected early.
- 02
Risk planning
If your treatment includes medicines known to affect the kidneys, a monitoring plan — and sometimes protective measures like extra hydration — is put in place.
- 03
Monitoring during treatment
Regular blood tests track kidney function and electrolytes throughout treatment cycles. Small changes are caught before they become problems.
- 04
Rapid response to problems
If kidney function changes, the kidney specialist works with your oncologist to adjust fluids, doses or timing — often without interrupting your cancer treatment.
Never stop or delay a cancer treatment because of kidney concerns on your own — decisions are best made jointly by your oncologist and kidney specialist.
Protecting yourself
What patients can do
A few practical habits make a real difference to kidney safety during cancer treatment.
Keep an up-to-date list of all your medicines and supplements, and share it with every doctor involved in your care.
During cancer treatment
- Drink fluids as advised, especially around chemotherapy
- Attend every scheduled blood test
- Report vomiting, diarrhoea or poor intake early
- Avoid over-the-counter painkillers (NSAIDs) unless approved
- Mention any herbal or alternative supplements you take
- Tell your team about any change in urine output or swelling
When should you seek medical help?
Contact your care team if you have
- A clear fall in urine output
- New swelling of legs, face or around the eyes
- Persistent vomiting or inability to drink
- Blood in the urine
- New or worsening breathlessness
- Muscle cramps, weakness or palpitations
Seek emergency care for
Severe breathlessness, confusion, chest pain, seizures, or passing almost no urine — these can indicate a serious kidney or electrolyte emergency.
The most important message
Kidney problems during cancer treatment are common, often preventable, and usually manageable — especially when a kidney specialist is involved early.
Facing cancer treatment with kidney concerns? Early specialist input helps.
If you are concerned about your kidney health, speak with a qualified healthcare professional. This information is for patient education and does not replace individual medical advice.