# Symptoms and phases of polycystic kidney disease
Polycystic kidney disease does not progress in clearly defined phases, but develops gradually over years to decades. The disease begins when cysts (fluid-filled cavities) grow and multiply in the kidneys. This process usually occurs step by step: at first the cysts grow slowly, then increasingly faster, and eventually the kidneys lose their function. The speed varies greatly between people — some patients have mild symptoms their entire life, others develop serious complaints much sooner.
Below we describe how the disease usually unfolds, what you may experience in each phase, and what that means for daily life.
Early phase (without symptoms or mild symptoms)
In the earliest period, the number of cysts in the kidneys increases, but the kidneys can still do their job well. Many people have **no symptoms** in this phase and discover their disease only because:
- family members already have polycystic kidney disease (because it is hereditary);
- an ultrasound or other examination done for another reason incidentally discovers the cysts.
If there are complaints, these are usually mild:
- **Flank or back pain**, sometimes very subtle, more often felt on one side or both sides where the kidneys are located;
- **Mild pressure or fullness sensation** in the abdomen, because the kidneys are slowly enlarging.
**What this means in daily life:**
Virtually nothing. Many people feel completely healthy. The pain, if it occurs, is usually not severe enough to hinder daily activities.
**Survival and duration:**
This phase can last years to decades — sometimes 20-40 years or longer. Kidney function remains reasonably stable. This is difficult to express in general figures because progression varies greatly. Research shows that approximately half of adults with hereditary polycystic kidney disease (ADPKD) develop severe kidney damage around their 60th year of life, but this is an average across large groups — some people have problems much earlier, others much later (Kidney Disease: Improving Global Outcomes guideline, 2018).
Moderate phase (mildly reduced kidney function)
After years or decades, the cysts begin to disturb kidney tissue more. Kidney function slowly declines, but people do not feel much of it — the kidneys have considerable reserves.
Symptoms that may occur:
- **Pain in the flanks or back** becomes more frequent and sometimes worse; sometimes radiating to the abdomen or groin;
- **Blood in urine**: sometimes visible, sometimes only under the microscope; occurs when cysts rupture or become inflamed (can be frightening, but is usually harmless);
- **Kidney stones** more often than normal — if it blocks the ureter it can cause severe pain;
- **Urinary tract infections**, more often than before;
- **High blood pressure**: many patients develop high blood pressure in this phase, because the growing cysts disturb the kidneys — this can occur without symptoms, but can also cause headaches, dizziness, or abdominal discomfort;
- **Fatigue** occurs, partly due to reduced kidney function (lack of erythropoietin, a substance that produces red blood cells), partly due to high blood pressure.
**What this means in daily life:**
This can already have considerable impact. Pain episodes can be more frequent and severe, which can affect activity planning. Recurring infections can be frustrating. Fatigue can reduce energy for work or hobbies. Many people find that they need to be more careful with physically demanding work or contact sports (because trauma to the kidneys can lead to more complications).
**Survival and duration:**
This phase lasts on average several years to more than a decade, depending on how quickly the disease progresses. The earlier someone enters this phase, the faster the further progression usually is. Recent research (2026) into prognosis in ADPKD emphasizes that individual prediction of disease progression is becoming increasingly possible, but is not yet exact — there are many factors that determine how quickly it progresses.
Advanced stage (moderately reduced kidney function)
Kidney function is now declining faster. Much of what the kidneys must do — filter waste, regulate fluid balance, influence blood pressure and blood cell formation — is beginning to fail noticeably. In this stage, many patients develop symptoms of kidney failure:
- **Persistent fatigue and lack of concentration**: because waste accumulates and the production of red blood cells decreases (anemia);
- **Nausea and sometimes vomiting**: especially in the morning, due to accumulation of waste (uremia);
- **Poor or changed appetite**: food tastes different, much food becomes unpleasant;
- **Swelling** in legs, feet or face (edema);
- **Shortness of breath**: due to fluid accumulation and/or anemia;
- **More intense and frequent pain** in the flanks/back, sometimes without apparent cause;
- **Itching**: an annoying side effect of waste accumulation;
- **High blood pressure** now usually clearly noticeable (headaches, dizziness, restless feeling);
- **Waking at night** from frequent urination — the kidneys can no longer regulate fluid excretion properly.
Complications may occur:
- **Cyst infection**: sudden severe pain, fever, sometimes infection that is difficult to treat;
- **Kidney stones** or blockage of cysts;
- **Bleeding** in or from cysts (sometimes only visible, sometimes experienced as anemia).
**What this means in daily life:**
This has a major impact. Fatigue can significantly limit work, hobbies or social activities. Nausea and loss of appetite can make eating more difficult. Many people must adjust their diet — less salt, fewer high-fluid products, sometimes protein restriction. Waking at night disrupts sleep and thus daily functioning. Periods of illness (infections, pain crises) can occur and may require hospitalization.
**Survival and duration:**
Once someone has moderate kidney failure, the step to severe kidney failure is typically visible within several years on average. However, this varies greatly. Some patients stabilize at this level for years, others progress faster. Median survival from this point (moderate kidney damage) to complete kidney failure is estimated in medical literature at approximately 4-8 years, but with large individual differences (these figures vary depending on the precise threshold value and population — no figure is exact here).
Severe stage (severely reduced kidney function)
Now the kidneys can do little of what they must do. Waste removal, fluid excretion and hormone formation are severely compromised. Most patients in this stage have regular complaints and need medical treatment.
Symptoms are now clear:
- **Severe fatigue**: many patients can no longer work;
- **Persistent nausea, vomiting, loss of appetite**: some can eat only with difficulty;
- **Intense itching all over the body** — very bothersome;
- **Muscle cramps**: due to disturbed mineral metabolism;
- **Concentration problems, memory problems** (uremic encephalopathy);
- **Headaches and dizziness** — high blood pressure is now almost always present;
- **Swelling** in feet, legs, face, sometimes in the lungs (fluid accumulation);
- **Shortness of breath** with minimal exertion or at rest;
- **Anemia** — pale appearance, persistent fatigue;
- **Irregular heartbeat** sometimes noticeable (heart rhythm problems due to disturbed minerals);
- **Bone pain or weakness** — bone metabolism disorders;
- **Restless sleep at night** or sleep apnea.
Complications occur more frequently:
- **Infections** of cysts;
- **Emergency situations** such as uncontrolled high blood pressure;
- **Heart problems** (enlargement of heart muscle, heart rhythm disturbances).
**What this means in daily life:**
The disease now dominates many activities. Most patients can no longer work. Many can only undertake limited activities. Nutrition must be strictly monitored — many foods are no longer possible. Many hospital visits for check-ups and treatment of complications. Many patients become psychologically burdened by the disease and the future.
**Survival and duration:**
Without dialysis or transplantation, people with severe kidney failure can usually function for a few months to 1-2 years, but this varies enormously depending on residual function, age, other diseases and how well symptoms are managed. When dialysis or transplantation begins, the picture changes drastically — many patients can then continue for years with reasonable quality of life. Median survival on dialysis for patients with ADPKD and severe kidney failure (before transplantation) is around 10-20 years, depending on age and comorbidity, but these figures say nothing about one person (source: various nephrology studies, 2018-2025).
End stage (complete kidney failure, kidney replacement therapy needed)
When kidney function drops below a certain point (usually less than 10-15% of normal), the kidneys can no longer cope. Without artificial kidney function (dialysis) or transplantation, severe poisoning occurs and death follows within weeks.
Most patients choose dialysis or transplantation. With dialysis (usually 3-4 times per week, a few hours) or transplantation, many years can be gained and quality of life can improve considerably. However, this is not a cure — it is replacement care that in the long run brings its own complications.
**Complaints may decrease** with dialysis or transplantation, but new challenges emerge (medication effects, transplant risk, dialysis-related complaints).
Other serious complications that can occur in any phase
In addition to the progression described above, patients may also be confronted with:
- **Cyst infection or inflammation**: sudden severe pain, fever, sometimes sepsis; requires antibiotics and sometimes hospitalization;
- **Liver involvement**: many patients with ADPKD develop cysts in the liver (usually without symptoms, but sometimes this leads to pain or liver congestion);
- **Brain aneurysms**: approximately 5-10% of patients with ADPKD have an aneurysm (usually without symptoms, but can be serious);
- **Heart valve abnormalities**: slightly more common in ADPKD;
- **Colon diverticula**: small pouches in the intestine that can become inflamed.
These complications are screened based on family history and patient-specific risk factors.
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When to contact your healthcare provider?
Contact **immediately** your GP or nephrologist (kidney doctor) if:
- **Sudden, severe pain in flank/back**, especially with fever — may indicate cyst infection;
- **