What is polycystic kidney disease?
Polycystic kidney disease is a genetic condition — one that’s passed down in families — in which many fluid-filled sacs, called cysts, grow in the kidneys. A few cysts in the kidneys are common and usually harmless with age. PKD is different: the cysts form in large numbers, keep growing, and slowly crowd out the healthy tissue around them. Over years, the kidneys enlarge — sometimes dramatically — and gradually filter less well.
Because PKD is inherited and lifelong, it’s a condition to manage over the long term rather than a problem to fix once. And here’s the encouraging part: how fast it progresses varies enormously, good care can slow it, and — for the first time — a medication can now slow the disease itself in some people. What you and your family do early makes a real difference.
How is PKD inherited? The two forms
There are two main forms of PKD, and they’re inherited differently.
Autosomal dominant (ADPKD)
By far the most common form — affecting roughly 1 in 400 to 1,000 people. Symptoms usually appear in adulthood, often between the 30s and 50s. A parent who has it has about a 50% chance of passing it to each child. Only one copy of the changed gene is needed.
Autosomal recessive (ARPKD)
Much rarer, and usually seen in infancy or early childhood. It requires a child to inherit the changed gene from both parents, who are typically healthy carriers. Because it’s so different, ARPKD is cared for largely in pediatric settings.
“Autosomal dominant” sounds technical, but the meaning is simple and important: in ADPKD, a single copy of the gene change — from either parent — is enough to cause the disease, and each child of an affected parent has a coin-flip chance of inheriting it. That’s why PKD is rarely just one person’s diagnosis. A smaller number of people develop ADPKD from a brand-new gene change, with no family history at all.
What are the symptoms of PKD?
PKD can be silent for years — many people feel completely well while cysts are slowly growing. When symptoms do appear, often in adulthood, they may include:
- High blood pressure — frequently the first sign, and one of the most important to find and treat
- Pain in the back or sides, or a dull ache, as the kidneys and cysts enlarge
- Blood in the urine (sometimes visible, sometimes found on a test)
- Kidney stones or urinary tract infections, which occur more often in PKD
- A feeling of fullness or a growing abdomen as the kidneys get larger
- Occasionally, heart flutters or palpitations
These can have many causes, so having them doesn’t mean you have PKD. But high blood pressure at a younger age — especially with a family history of kidney disease — is worth taking seriously.
High blood pressure is often the earliest signal in PKD, and controlling it is the single most powerful thing you can do to protect your kidneys over the long run.
How is PKD diagnosed?
PKD is usually straightforward to identify:
- Imaging is the main tool. A kidney ultrasound is the most common test — reliable, inexpensive, and non-invasive. CT or MRI can detect smaller cysts and measure kidney size, which helps gauge how the disease may progress.
- Family history is a major clue. Knowing that a parent or sibling had PKD or unexplained kidney failure points the way.
- Genetic testing (a blood test) can confirm the diagnosis in select situations — when imaging is unclear, in younger adults, or for family planning. It isn’t needed for everyone.
Because the way ADPKD progresses varies so much, your nephrologist may track kidney size along with your kidney function over time. That helps identify who is likely to progress faster — and who might benefit most from disease-slowing treatment.
It’s not only the kidneys
Because PKD is genetic, it can affect more than the kidneys:
- Liver cysts are common and usually don’t change how the liver works, though occasionally they grow large enough to cause discomfort.
- Brain aneurysms — a weak spot in a blood vessel in the brain — occur somewhat more often in some families with ADPKD. Not everyone needs screening, but it’s strongly worth raising with your doctor if a brain aneurysm, bleed, or sudden stroke runs in your family.
- Heart valve changes can occur, occasionally causing flutters or a murmur a doctor may want to check.
- High blood pressure, very common in PKD, deserves close attention because it affects both the kidneys and the heart.
None of this is a reason to worry about every symptom — most people with PKD never have a brain aneurysm. But it’s a reason to share your full family history with your kidney team, so screening happens when, and only when, it makes sense for you.
Does PKD always lead to kidney failure?
This is the question on most people’s minds, and the honest answer is reassuring in its nuance: not always, and not on a fixed timeline. Some people with ADPKD keep good kidney function their whole lives; others progress toward kidney failure, often in their 50s or 60s. Roughly half of people with ADPKD reach kidney failure by around age 60, but the pace varies widely — even among relatives with the same gene change.
What tends to speed things up is well understood, and much of it is treatable: uncontrolled blood pressure, larger kidney size, protein in the urine, and smoking. Acting on those — especially blood pressure — can change the trajectory. If kidney function does decline toward failure over the years, there is time to plan, and effective treatments (including transplant, for which many people with PKD are good candidates) are available. We’ll always talk those options through with you well in advance. You can read more on our kidney failure (ESRD) page.
How is PKD managed — including what’s new?
There’s no cure for PKD yet, but management protects kidney function and quality of life — and the toolkit recently got meaningfully better. Care rests on a few pillars:
Blood pressure control
The most important step, started early. Kidney-protective blood-pressure medications (often an ACE inhibitor or ARB) protect the kidneys and the heart at once. Good control is proven to slow the disease.
A medication that slows the disease
For the first time, a medicine (tolvaptan) can slow the loss of kidney function in adults with ADPKD at risk of rapid progression — used in selected patients, with monitoring.
Treating complications
Managing pain, kidney stones, and urinary infections as they arise, and addressing blood in the urine when it occurs.
Regular monitoring
Tracking kidney function, blood pressure, and sometimes kidney size — so changes are caught early and treatment can be adjusted.
The newer medication, tolvaptan, deserves a closer word because it’s the first treatment shown to slow ADPKD itself. It works by reducing the signal that drives cyst fluid to build up, slowing both cyst growth and the decline in kidney function. It isn’t for everyone: it’s used in adults judged to be at risk of rapid progression, requires regular blood tests to watch the liver, and causes noticeably increased thirst and urination — so a clear plan for staying hydrated, and for “sick days,” is part of using it safely. Whether it’s right for you is a careful conversation with a kidney specialist who knows your numbers and your history.
Want to know whether you're a candidate for the medication that can slow PKD?
Request an AppointmentDiet and daily habits
No diet has been proven to stop cysts from forming, but a kidney- and heart-friendly pattern genuinely helps — mostly by protecting your blood pressure and overall kidney health:
- Lower your sodium. Less salt is one of the most effective ways to keep blood pressure down — the key lever in PKD.
- Stay well hydrated with plain water. Many adults with ADPKD are encouraged to aim for at least about 2 liters a day; this matters even more if you take tolvaptan. Ask your nephrologist for a target that fits you.
- Keep a healthy weight and stay active — both ease the strain on your kidneys and heart.
- Go easy on caffeine, which is often suggested in moderation for ADPKD.
- Don’t smoke, which speeds kidney and blood-vessel damage.
- Be careful with over-the-counter NSAIDs like ibuprofen and naproxen, which can stress the kidneys — ask before using them regularly.
What it means for your family
Because ADPKD is inherited, a diagnosis is rarely about just one person — it naturally raises questions for parents, siblings, and especially children. That can feel daunting, but it’s also an opportunity: relatives who learn they carry PKD early can start blood pressure control and monitoring sooner, when there’s the most to protect.
Family members can talk with their own doctor about whether screening makes sense, and in some cases genetic counseling helps — particularly for younger adults thinking about their own children, or when the picture is unclear. There’s no single right answer for every family; the goal is informed choices, made calmly and ahead of time. Because we care for families across metro Atlanta, we’re glad to help your relatives understand their options too.
When should you see a nephrologist?
A nephrologist is a kidney specialist, and PKD is exactly the kind of lifelong, evolving condition that benefits from one. It’s worth seeing a kidney specialist when:
- You’ve been diagnosed with PKD or found to have multiple kidney cysts
- You have a family history of PKD or unexplained kidney failure
- You have high blood pressure, especially at a younger age, alongside a family history
- You have blood in the urine, recurrent kidney stones, or frequent urinary infections
- You want to know whether you’re a candidate for disease-slowing medication
- Your kidney function is declining, or you’d like a plan for the years ahead
Seeing a specialist earlier — rather than waiting until kidney function is low — consistently leads to better outcomes, and gives you and your family the most time to act. For the broader picture of how kidney disease is monitored and slowed, see our chronic kidney disease guide, our page on high blood pressure & kidneys, and our general nephrology services.
