Quick answer. Polycystic kidney disease (PKD) is an inherited condition in which many fluid-filled cysts grow in the kidneys, gradually enlarging them and reducing function. The most common form (ADPKD) runs in families, so relatives may be offered screening; care focuses on blood pressure control and, for selected rapidly progressing patients, the medicine tolvaptan to slow cyst growth.
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Polycystic kidney disease (PKD) is one of the most common inherited kidney disorders. Numerous fluid-filled cysts develop in the kidneys, causing them to enlarge over time and slowly reducing their ability to filter blood. The most common type, autosomal dominant PKD (ADPKD), usually appears in adulthood.
Because ADPKD is inherited, a parent with the condition has a 50% chance of passing it to each child. This is why family screening and counselling are an important part of care.
At a glance
| Aspect | Detail | Why it matters |
|---|---|---|
| Inheritance | Autosomal dominant | Each child has a 50% chance of inheriting |
| Main feature | Many kidney cysts that enlarge over time | Gradually reduces kidney function |
| Common issues | High blood pressure, back/side pain | BP control protects the kidneys |
| Specific treatment | Tolvaptan in selected patients | Can slow cyst growth and decline |
What is polycystic kidney disease?
In PKD, many cysts (fluid-filled sacs) form in the kidneys. As they grow and multiply, the kidneys become enlarged and their normal tissue is gradually replaced, which slowly reduces filtering function. ADPKD is the most common inherited form and typically becomes apparent in adulthood. A rarer form, autosomal recessive PKD, presents in infancy or childhood. PKD can also affect other organs, sometimes causing cysts in the liver.
Symptoms and complications
Many people have no symptoms for years. When they occur, features may include:
- High blood pressure, often one of the earliest signs.
- Pain in the back or sides.
- Blood in the urine.
- Recurrent urinary or kidney infections, and kidney stones.
- Gradual loss of kidney function, sometimes progressing to kidney failure.
Some people with ADPKD can develop aneurysms (weak spots) in brain blood vessels; this is uncommon but is why any family history of brain aneurysm or sudden severe headache should be mentioned to your doctor.
Family screening and genetic counselling
Because ADPKD is passed down in families, blood relatives of someone with PKD may be offered screening, usually with an ultrasound of the kidneys, and in some cases genetic testing. Screening decisions are personal and best made after counselling, as there are benefits (early blood pressure control and planning) and considerations (such as implications for insurance and family planning). A nephrologist or genetic counsellor can guide you.
Controlling blood pressure
High blood pressure is common in PKD and, if uncontrolled, speeds the loss of kidney function and raises heart and stroke risk. Good blood pressure control is one of the most important things you can do to protect your kidneys. This typically involves a low-salt diet, healthy weight, regular activity, and blood pressure medicines (often ACE inhibitors or ARBs). Staying well hydrated and avoiding kidney-harming painkillers are also commonly advised.
Tolvaptan and other treatments
For selected patients with ADPKD that is progressing rapidly, the medicine tolvaptan can slow the growth of cysts and the decline in kidney function. In clinical trials it reduced the rate of kidney enlargement and slowed loss of filtering function. It is not suitable for everyone, commonly causes increased thirst and urination, and requires monitoring of liver function, so it is prescribed and supervised by a kidney specialist. Other care focuses on treating complications such as infections, stones and pain, and planning ahead if kidney function declines.
When to see a nephrologist – red flags
See a doctor if you have a family history of PKD, newly diagnosed high blood pressure at a young age, blood in the urine, or repeated kidney infections or stones. Ask for nephrology referral to assess kidney function and discuss screening and treatment. Seek urgent care for a sudden, severe (thunderclap) headache, the worst headache of your life, severe loin pain with fever, or a sudden drop in urine output, as these can signal serious complications.
Self-management and protecting your kidneys
Beyond medical treatment, daily habits help protect kidney function in PKD. Keep your blood pressure within the target your doctor sets, taking medicines consistently and checking readings at home if advised. Reduce salt, maintain a healthy weight, stay physically active, and keep well hydrated unless told otherwise. Avoid medicines that can stress the kidneys, particularly regular use of non-steroidal anti-inflammatory painkillers (such as ibuprofen), and check with a pharmacist before using over-the-counter remedies or supplements. If you have cysts in the liver as well, your doctor may give additional advice.
Because contact sports carry a small risk of injuring enlarged kidneys, some people are advised to take care with high-impact activities; ask your nephrologist what is appropriate for you. Tell any doctor treating you that you have PKD, as it affects choices around imaging, medicines and surgery.
Family planning and screening relatives
Because ADPKD is inherited, family members may wish to consider screening, usually with a kidney ultrasound and sometimes genetic testing, after counselling about the benefits and implications. Couples planning a family may also wish to discuss options with a genetic counsellor. These are personal decisions, and there is no single right answer; the aim is to give you accurate information so you can choose what is right for your circumstances.
Costs and support in Singapore
People with PKD are usually followed by a nephrologist, with care at public hospitals and polyclinics offered at subsidised rates for eligible Singapore Citizens and Permanent Residents. Chronic kidney disease is among the conditions covered under the Chronic Disease Management Programme (CDMP), which allows MediSave to help pay for outpatient management of eligible chronic conditions; ask your clinic whether this applies to you. Specialist medicines such as tolvaptan require specialist supervision and monitoring, and your care team can advise on costs and any assistance available. A medical social worker can help if affordability is a concern.
Questions to ask your doctor
- How is my kidney function now, and how often should it be monitored?
- Is my PKD likely to progress quickly, and am I a candidate for tolvaptan?
- What is my blood pressure target, and which medicines suit me best?
- Should my relatives be screened, and how would they go about it?
- Which painkillers and supplements should I avoid?
Common questions
Will I definitely need dialysis?
Not everyone with PKD progresses to kidney failure, and the rate varies widely. Good blood pressure control and, for some, specific medicines can slow decline. Your nephrologist monitors your kidney function over time.
Can my children inherit PKD?
With autosomal dominant PKD, each child has a 50% chance of inheriting the condition. Screening and genetic counselling can help families understand their options.
Related guides
- Best Nephrology & Kidney Clinics in Singapore — our editorial shortlist
- Dialysis
- Diabetic Kidney Disease
- Glomerulonephritis
Sources
- NKF Singapore – Kidney Failure
- SingHealth – Polycystic Kidney Disease
- National University Hospital (NUH) – Nephrology
- HealthHub – Chronic Kidney Disease
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