Kidney disease means a condition is affecting how your kidneys work or their structure. Your kidneys filter waste and extra fluid from blood, help regulate minerals and blood pressure, and perform other jobs your body needs.
The term covers more than one condition. A problem may develop suddenly, as in acute kidney injury (AKI), or persist over time, as in chronic kidney disease (CKD). Kidney stones and infections are other kidney-related problems, but having a stone does not automatically mean you have CKD.
Many people with early CKD feel well. Blood and urine tests—not symptoms alone—are often how it is found. If you have received an abnormal result, the next step is to learn what it means for you, including whether the change is new or long-standing.
For general educational material on everyday kidney health habits, you can explore the Kidney Coach program. Use your healthcare team to interpret test results and decide on treatment.
What do the kidneys do?
Your two kidneys continuously filter blood. They remove waste and extra fluid to make urine and help maintain the right balance of substances such as sodium, potassium, and phosphorus.
Kidneys also help regulate blood pressure, support red blood cell production, and contribute to bone health. This is why kidney disease can affect more than urination. Changes may involve blood pressure, swelling, anemia, or mineral levels.
The effects depend on which condition you have and how much kidney function is affected.
What are the main types of kidney disease?
Chronic kidney disease (CKD)
CKD describes an abnormality of kidney structure or function that persists for at least three months and matters for health. It may show up as a persistently reduced estimated glomerular filtration rate (eGFR), albumin in urine, or another sign of kidney damage.
CKD often develops slowly. Many people have few or no symptoms early on.
Acute kidney injury (AKI)
AKI means kidney function suddenly worsens, often over hours or days. It can happen during a serious illness, after substantial fluid loss, because of a medicine-related problem, or with a urinary blockage, among other causes.
Some people recover from AKI, while others need significant treatment and follow-up. A person with CKD can also develop AKI on top of their existing condition.
For a detailed comparison, read the difference between acute and chronic kidney disease.
Other kidney problems
Kidney infections, stones, cysts, and diseases affecting the kidney filters need their own diagnosis and treatment. Some can contribute to lasting damage; others resolve without causing CKD. A new fever, severe side pain, or blood in urine should not be dismissed as “just my kidney disease.”
What causes chronic kidney disease?
Diabetes and high blood pressure are two common causes of CKD in adults. Other possible causes include conditions affecting the kidney filters, inherited kidney disorders, and some structural or urinary tract problems.
You may also have more than one factor. For example, someone with diabetes may also have high blood pressure. Finding the cause helps your clinician choose treatment and decide which tests to follow.
Having a risk factor does not mean CKD is inevitable. It does mean that asking about kidney blood and urine tests is worthwhile.
What are the symptoms?
Early CKD often causes no symptoms. You can have kidney damage even if you feel well, urinate normally, and have no back pain.
As kidney disease progresses—or if a different kidney problem occurs—possible changes include:
- Swelling around the eyes, feet, or ankles.
- Fatigue or weakness.
- Changes in urination.
- Persistent foamy urine, which may occur with protein loss.
- Poor appetite or nausea.
- Itching.
- Shortness of breath when fluid builds up.
These symptoms are not specific to kidney disease. A clinician can assess their cause using your history, examination, and tests.
Severe side or back pain is not a typical way early CKD announces itself. It may have another cause, including a stone, infection, or a muscle problem. See kidney pain versus back pain for the clues and warning signs.
For a fuller symptom discussion, read 10 signs of kidney disease you shouldn’t ignore.
Who should ask about kidney testing?
Ask a healthcare professional whether you need testing if you have:
- Diabetes.
- High blood pressure.
- Heart or blood vessel disease.
- A family history of kidney failure.
- A previous episode of AKI.
- Another condition or treatment your clinician says may affect your kidneys.
Testing can find problems before you notice symptoms. Your clinician can advise how often you need to be checked.
If you want to learn more about habits that support your overall kidney care plan, you can review the Kidney Coach program. Keep regular blood pressure checks, prescribed treatment, and recommended kidney tests in place.
How is kidney disease diagnosed?
Two particularly useful measurements are eGFR from a blood test and albumin in a urine sample.
| Test | What it helps show | What to remember |
|---|---|---|
| Blood creatinine | A waste product used to help estimate kidney filtration | Muscle mass and other factors can affect the result. |
| eGFR | An estimate of filtering function | A single result needs comparison with earlier and repeat tests. |
| Urine albumin-to-creatinine ratio (uACR) | Whether albumin is leaking into urine | Kidney damage may be present even with a relatively preserved eGFR. |
| Other blood and urine tests | Minerals, blood cells, infection, or other concerns | The tests needed depend on your condition. |
| Imaging or other investigations | Kidney structure or a suspected blockage | Not everyone needs imaging. |
CKD is generally assessed using abnormalities that persist over time. If kidney function has changed suddenly, your clinician should consider an acute problem rather than waiting three months to investigate.
For more on a common blood result, see understanding creatinine levels.
What do CKD stages mean?
Clinicians use eGFR ranges to describe the level of kidney filtration. They also consider urine albumin and the cause of the condition. Two people with similar eGFR values can have different risks and treatment needs if their albumin results or underlying diseases differ.
A stage is a tool for planning care, not a prediction that everyone will progress to kidney failure. Ask your clinician for your eGFR, uACR, likely cause, and how those results have changed over time.
Can kidney disease be reversed?
The answer depends on the condition. Some acute declines in kidney function may improve when the cause is treated. Advanced, long-standing CKD generally cannot be reversed by a food, herb, or supplement.
That distinction does not make treatment pointless. Managing a cause and protecting remaining kidney function can delay complications and improve health. A single better eGFR result does not prove that all previous kidney damage has healed.
Our article can low GFR be reversed? explains how to interpret an improvement.
How is CKD treated?
Your plan depends on the cause, eGFR, urine albumin, other conditions, and symptoms. It may include:
- Managing blood pressure.
- Managing diabetes, if present.
- Taking prescribed medicines that help protect the kidneys when appropriate.
- Adjusting food choices with a renal dietitian.
- Reviewing medicines and supplements for kidney safety.
- Monitoring urine albumin, eGFR, and complications over time.
- Treating problems such as anemia, swelling, or mineral imbalance when present.
Some medicines may protect the kidneys even if you do not feel an immediate effect. Do not stop prescribed treatment in favor of a “kidney cleanse.” Discuss any side effect or concern with the clinician who prescribed it.
Does everyone need a kidney diet?
There is no single food list for everyone with kidney disease. Many people are advised to reduce excess sodium. Restrictions on potassium, phosphorus, protein, or fluids depend on blood results, treatment, and nutritional needs.
A person receiving dialysis may need more protein than a person with CKD who is not on dialysis. Cutting out too many foods without guidance can lead to poor nutrition.
Start with kidney-friendly recipes and foods to eat and avoid and ask a renal dietitian which adjustments apply to you.
What happens if kidney function becomes very low?
If kidney failure develops, your team can explain treatment choices, which may include hemodialysis, peritoneal dialysis, or a kidney transplant. Some people choose conservative management, which continues active care with a focus on symptoms and quality of life without dialysis or transplantation.
These are important decisions that deserve time and discussion. A commercial program cannot replace dialysis or determine whether you need it.
When should you seek urgent medical help?
Seek prompt assessment if you have much less urine than usual, rapidly worsening swelling, persistent vomiting or diarrhea, fever with side pain, or a sudden worsening in kidney test results.
Seek emergency care for severe breathlessness, chest pain, new confusion, fainting, or suddenly being unable to pass urine with significant pain or illness. Follow any urgent instruction from your laboratory or healthcare team.
Questions to ask after a diagnosis
Bring your test reports and ask:
- What kind of kidney problem do I have, and what is the likely cause?
- Is this acute, chronic, or both?
- What are my latest eGFR and urine albumin results?
- How do they compare with my earlier results?
- What treatment is most important for me now?
- Which food or fluid changes apply to my results?
- Which over-the-counter medicines or supplements should I check before using?
- When should I repeat tests or see a kidney specialist?
Understanding your own results is more useful than trying to follow every kidney tip online.
Frequently asked questions
Can I have kidney disease without symptoms?
Yes. Early CKD commonly causes no noticeable symptoms. Blood and urine tests are often needed to find it.
Is a high creatinine result enough to diagnose CKD?
No. Creatinine needs interpretation alongside eGFR, urine findings, previous results, and how long the abnormality has been present.
Does kidney disease always progress to dialysis?
No. Outcomes vary considerably. The cause, level of kidney function, urine albumin, and treatment all matter.
Is back pain always a symptom of kidney disease?
No. Back pain has many possible causes, and early CKD often causes no pain. Fever, urinary symptoms, severe side pain, or blood in urine deserve medical assessment.
Can one diet or supplement cure CKD?
No single food, supplement, or general program has been established as a cure for CKD. Treatment is based on the diagnosis and your individual results.
The takeaway
Kidney disease is a group of conditions, not one diagnosis with one treatment. Acute problems may develop suddenly; CKD persists over time and can be present without symptoms. Blood eGFR and urine albumin help detect and monitor it.
Find out your likely cause, compare test results over time, and make a care plan with your clinician. The goal is to treat problems that can improve, protect remaining function, and manage your overall health.
For additional educational material on everyday kidney health habits, explore the Kidney Coach program. Use it alongside your healthcare team’s diagnosis, prescribed treatment, and follow-up tests.
Resources
- National Institute of Diabetes and Digestive and Kidney Diseases: Kidney Disease Overview
- National Institute of Diabetes and Digestive and Kidney Diseases: Chronic Kidney Disease
- National Institute of Diabetes and Digestive and Kidney Diseases: Causes of Chronic Kidney Disease in Adults
- National Institute of Diabetes and Digestive and Kidney Diseases: Chronic Kidney Disease Tests and Diagnosis
- National Institute of Diabetes and Digestive and Kidney Diseases: Managing Chronic Kidney Disease
- National Institute of Diabetes and Digestive and Kidney Diseases: Choosing a Treatment for Kidney Failure