Chronic kidney disease stages overview
Informed by recognized medical guidance
Overview
Chronic kidney disease (CKD) means your kidneys are damaged and cannot filter your blood as well as they should. This damage happens slowly over time, often over many years. Kidney disease has five stages, from mild (stage 1) to severe (stage 5), also called kidney failure.
Key facts
- The five stages of CKD are based on how well your kidneys are working.
- Many people with early-stage CKD have no symptoms and feel fine.
- CKD can be managed with lifestyle changes and medical care to slow its progression.
Yes, chronic kidney disease is quite common. It affects about 1 in 10 adults worldwide. Many people don't know they have it because early stages often cause no symptoms.
CKD can affect people of all ages, but it is more common in older adults. People with diabetes, high blood pressure, or a family history of kidney disease are at higher risk.
Symptoms
- You have sudden severe difficulty breathing
- You pass out or feel faint
- You have chest pain or pressure
- ⚠You notice swelling that gets worse quickly
- ⚠You have very little urine output
- ⚠You have blood in your urine
- ⚠You feel confused or very drowsy
Common symptoms
- Often there are no symptoms in early stages.
- As it progresses, you may feel tired, have swollen ankles or feet, experience shortness of breath, have trouble concentrating, or notice changes in urination (like foamy or bloody urine).
Symptoms in children
- Children with CKD may have poor growth, frequent urination at night, high blood pressure, or swelling in the face and hands.
Symptoms in older adults
- Older adults may have symptoms like confusion, loss of appetite, weight loss, and muscle cramps. They are also more likely to have other health problems that can mask or worsen kidney disease.
Causes
Main causes
- Diabetes (high blood sugar)
- High blood pressure
- Glomerulonephritis (inflammation of the kidney's filtering units)
- Polycystic kidney disease (an inherited condition causing cysts in the kidneys)
Risk factors
- Having diabetes or high blood pressure
- Having a family history of kidney failure
- Being overweight or obese
- Being over 60 years old
- Smoking
- Using certain medications long-term without monitoring (like painkillers called NSAIDs)
When to see a doctor
See a doctor urgently if:
- If you have any sudden changes in urination, swelling, or severe symptoms like chest pain or trouble breathing, seek urgent care.
Book a routine appointment if:
- If you have risk factors like diabetes or high blood pressure, see your doctor regularly for kidney function checks.
- If you notice mild swelling, fatigue, or changes in urination that persist, make a routine appointment.
Diagnosis
Doctors diagnose CKD using blood and urine tests to measure how well your kidneys are filtering waste. They also use your medical history and physical exam.
Tests that may be done
- Blood test (eGFR): estimates how much kidney function you have.
- Urine test (uACR): checks for protein or blood in your urine.
- Imaging tests (like ultrasound): looks at the size and structure of your kidneys.
- Kidney biopsy (sometimes): takes a small sample of kidney tissue for testing.
What to expect at your appointment
Your doctor will explain your test results and what stage of kidney disease you have. You will likely need regular monitoring to track changes. Your doctor may refer you to a kidney specialist (nephrologist) for advanced stages.
Treatment
Treatment for CKD focuses on slowing the disease, managing symptoms, and preventing complications. The treatment plan depends on the stage and underlying cause.
Self-care at home
- Follow a kidney-friendly diet (low in salt, and later possibly low in protein and phosphorus).
- Stay physically active and maintain a healthy weight.
- Stop smoking and limit alcohol.
- Monitor your blood pressure and blood sugar if you have diabetes.
Medical treatments
Doctors may prescribe medications to control blood pressure, lower cholesterol, treat anemia (low red blood cells), or manage other conditions that affect your kidneys. Always take medications as directed and ask your doctor about side effects. For advanced kidney disease, treatments may include dialysis (a machine that filters your blood) or a kidney transplant.
When is surgery considered?
A kidney transplant may be an option for some people with stage 5 kidney failure. This is a surgery to place a healthy kidney from a donor into your body. Talk to your transplant team about eligibility and risks.
Living with this condition
Living with CKD means managing your health day by day. You will need regular check-ups, take medications as prescribed, and make healthy lifestyle choices. Many people with CKD lead full, active lives.
Lifestyle tips
- Follow your diet and fluid guidelines.
- Exercise regularly – even walking helps.
- Monitor your blood pressure at home if your doctor recommends.
- Take your medicines on time.
- Avoid non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen without your doctor's approval.
Diet and exercise
Eat a balanced diet with less salt, processed foods, and saturated fats. Your doctor or dietitian can give you specific advice based on your stage. Stay active with moderate exercise like walking, swimming, or cycling for at least 150 minutes a week, if you are able.
Mental health and emotional wellbeing
Dealing with a chronic illness can be stressful and may affect your mood. It's normal to feel worried or sad. Talk to your doctor or a counselor. Support from family and friends also helps.
Prevention
You can reduce your risk of kidney disease by managing conditions like diabetes and high blood pressure, staying hydrated, eating a healthy diet, and avoiding long-term use of certain painkillers. However, not all causes can be prevented.
Vaccines
Ask your doctor about recommended vaccinations, such as the flu shot and pneumonia vaccine, to prevent infections that could harm your kidneys.
Screening programmes
If you have risk factors, ask your doctor for regular blood and urine tests to check your kidney function. Early detection is key.
Complications
If left untreated
- Progression to kidney failure (stage 5) requiring dialysis or transplant.
- Heart disease and stroke.
- Anemia (low red blood cells causing fatigue).
- Bone disease due to mineral imbalance.
- Fluid buildup causing swelling and breathing problems.
Long-term outlook
Many people with CKD, especially those diagnosed early, can manage their condition and slow its progression with treatment and lifestyle changes. Even if kidney function declines, options like dialysis and transplant can help you live a full life. Your healthcare team will support you every step of the way.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 16, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.