Kidney Disease: 12 Critical Facts to Protect Health

Updated on: October 18, 2026
Written by: Adel Galal
Medical review status: This article has not been medically reviewed by a nephrologist, physician, renal dietitian, pharmacist, or another licensed healthcare professional.

Kidney disease can damage the kidneys slowly, often without obvious symptoms at first. Many people feel well while kidney damage is already present, which is why blood and urine tests matter so much.

The two most useful routine markers are estimated glomerular filtration rate, called eGFR, and the urine albumin to creatinine ratio, called UACR. Together, they show how well the kidneys filter blood and whether protein is leaking into the urine.

Diabetes and high blood pressure are the most common causes of chronic kidney disease in adults, but many other conditions can damage the kidneys.

This article is for general information and education. It does not replace medical advice, diagnosis, or treatment.

For a treatment focused guide, read Kidney Disease Treatment. You can also review Kidney Disease Symptoms and Kidney Healthy Foods.

What Is Kidney Disease?

Kidney disease means the kidneys have a problem with their structure or function.

Your kidneys normally:

• Filter waste from the blood
• Remove extra fluid
• Balance sodium and potassium
• Help control blood pressure
• Help regulate acid balance
• Support red blood cell production
• Help maintain healthy bones and minerals

When kidney function falls, these jobs become harder.

Chronic Kidney Disease vs Acute Kidney Injury

These are not the same condition.

Chronic kidney disease

Chronic kidney disease, or CKD, means kidney damage or reduced kidney function has been present for at least three months.

CKD often develops slowly.

Acute kidney injury

Acute kidney injury, or AKI, is a sudden decline in kidney function that can develop over hours or days.

Possible causes include:

• Severe dehydration
• Serious infection
• Very low blood pressure
• Urinary blockage
• Some medicines
• Major illness or surgery

A single low eGFR during an acute illness should not automatically be labeled chronic kidney disease.

12 Critical Facts About Kidney Disease

1. Early Kidney Disease Can Be Silent

Most people with early CKD do not feel sick.

You may have:

• No pain
• No swelling
• Normal looking urine
• Normal urine volume
• No obvious fatigue

This is why screening matters for people at higher risk.

2. eGFR Estimates Kidney Filtration

eGFR means estimated glomerular filtration rate.

It estimates how well your kidneys filter blood.

The calculation usually uses blood creatinine plus factors such as age and sex. Modern equations no longer use a race coefficient.

One result should be interpreted in context because dehydration, illness, muscle mass, medicines, and other factors can affect creatinine.

3. Urine Albumin Is Just as Important

Kidney filters normally keep most albumin in the blood.

When the filters become damaged, albumin can leak into urine.

The preferred test is often a urine albumin to creatinine ratio, or UACR.

A result above 30 mg/g may be a sign of kidney damage and often needs confirmation.

4. One Abnormal Kidney Test Does Not Always Mean CKD

Chronic kidney disease generally requires abnormal kidney findings that persist for at least three months.

For example, kidney function may fall for a short time because of:

• Dehydration
• Infection
• Low blood pressure
• A medicine effect
• Urinary blockage

Repeat testing helps separate chronic disease from a temporary change.

5. Diabetes Is a Leading Cause

High blood glucose can damage tiny blood vessels in the kidneys.

Over time, this can cause diabetic kidney disease.

People with diabetes often need regular:

• eGFR testing
• UACR testing
• Blood pressure checks
• Glucose monitoring

Read Diabetes and Kidney Disease.

6. High Blood Pressure Can Damage Kidneys

High blood pressure can damage kidney blood vessels.

Kidney disease can also make blood pressure harder to control.

This creates a cycle where each condition can worsen the other.

Controlling blood pressure is one of the most important parts of CKD care.

7. CKD Stage Depends on More Than One Number

Kidney disease is classified using:

• The cause
• The eGFR category
• The albuminuria category

This is sometimes called CGA classification.

Two people with the same eGFR can have different kidney risks if their urine albumin levels are different.

8. Kidney Disease Also Raises Heart Risk

CKD is closely linked with cardiovascular disease.

People with CKD can have a higher risk of:

• Heart attack
• Stroke
• Heart failure
• Cardiovascular death

Kidney care is therefore also heart care.

9. Modern Medicines Can Protect the Kidneys

Treatment has changed greatly in recent years.

Depending on the person's condition, a healthcare professional may consider medicines such as:

• ACE inhibitors
• ARBs
• SGLT2 inhibitors
• Selected nonsteroidal mineralocorticoid receptor antagonists
• Selected GLP 1 based medicines when diabetes or other indications are present

These medicines are not right for everyone.

Kidney function, potassium, blood pressure, diabetes, albuminuria, pregnancy, and other medicines all affect the choice.

10. NSAID Painkillers Can Harm the Kidneys

NSAIDs can reduce blood flow through the kidneys.

Examples include:

• Ibuprofen
• Naproxen
• Other nonsteroidal anti inflammatory medicines

They can contribute to acute kidney injury and may worsen CKD, especially during dehydration or illness.

If you have CKD, ask your healthcare professional or pharmacist which pain medicines are safe for you.

11. There Is No Single Kidney Diet for Everyone

A person with early CKD and normal potassium may need a very different diet from someone on dialysis.

Food choices depend on:

• eGFR
• UACR
• Blood potassium
• Blood phosphorus
• Blood pressure
• Diabetes
• Swelling
• Body weight
• Dialysis status

Do not automatically stop eating fruit, vegetables, beans, dairy, or whole grains because you were told you have kidney disease.

12. Kidney Failure Does Not Always Mean Dialysis Starts Immediately

Stage G5 CKD means eGFR is below 15.

But dialysis decisions are based on the whole clinical picture, not one number alone.

Doctors also consider:

• Symptoms
• Fluid overload
• Potassium
• Acid balance
• Nutrition
• Uremic complications
• Overall health

Some people with advanced CKD can be monitored before dialysis is required.

Kidney Disease Symptoms

Early CKD often causes no symptoms.

As disease becomes more advanced, possible symptoms include:

• Swelling in the feet or ankles
• Fatigue
• Sleep problems
• Poor concentration
• Loss of appetite
• Nausea
• Vomiting
• Itchy or dry skin
• Muscle cramps
• Foamy urine
• Changes in urination
• Shortness of breath
• Chest discomfort in severe disease

These symptoms do not prove kidney disease because heart disease, liver disease, anemia, medicines, and many other conditions can cause similar problems.

Does Kidney Disease Cause Pain?

Chronic kidney disease itself often does not cause kidney pain.

Pain near the kidney area may be caused by:

• Kidney stones
• Kidney infection
• Urinary blockage
• Muscle or spine problems
• Other abdominal conditions

Do not use pain as a screening test for CKD.

Does Foamy Urine Mean Kidney Disease?

Foamy urine can sometimes happen when albumin is leaking into urine.

However, temporary foam can also occur from:

• A fast urine stream
• Concentrated urine
• Cleaning chemicals in the toilet

Persistent foam deserves a urine test rather than visual diagnosis.

Does Swelling Mean Kidney Failure?

No.

Swelling can occur with kidney disease, but it can also result from:

• Heart failure
• Liver disease
• Vein problems
• Medicines
• Pregnancy
• Lymphatic disease

New or worsening swelling should be medically assessed.

What Causes Chronic Kidney Disease?

Common causes include:

• Diabetes
• High blood pressure
• Glomerular diseases
• Polycystic kidney disease
• Lupus and other autoimmune diseases
• Repeated kidney infections
• Long term urinary blockage
• Inherited kidney disorders
• Congenital kidney or urinary tract problems
• Previous severe acute kidney injury
• Selected medicines or toxins

Finding the cause matters because treatment differs.

Who Is at Higher Risk?

Risk is higher if you have:

• Diabetes
• High blood pressure
• Heart disease
• Heart failure
• A family history of kidney failure
• Previous acute kidney injury
• Inherited kidney disease
• Autoimmune disease
• Obesity

If you are at higher risk, ask how often your kidneys should be checked.

The Two Core Kidney Tests

1. eGFR blood test

The eGFR estimates how much blood your kidneys filter.

It is usually calculated from serum creatinine.

2. UACR urine test

UACR checks how much albumin is leaking into the urine compared with creatinine.

A persistent UACR above 30 mg/g may indicate kidney damage.

Other Kidney Tests

Depending on the situation, a healthcare professional may also order:

• Urinalysis
• Blood urea nitrogen
• Potassium
• Sodium
• Bicarbonate
• Calcium
• Phosphorus
• Blood glucose
• A1C
• Complete blood count
• Cystatin C
• Kidney ultrasound
• Other imaging
• Kidney biopsy in selected cases

Kidney Disease Stages

Albuminuria Categories

Higher albuminuria usually means greater kidney and cardiovascular risk.

Can eGFR Go Up and Down?

Yes.

Small changes can occur because of:

• Hydration
• Acute illness
• Medication changes
• Laboratory variation
• Changes in creatinine production

The trend over time is often more informative than one result.

Is eGFR a Percentage of Kidney Function?

No.

eGFR is reported in milliliters per minute per 1.73 square meters.

An eGFR of 30 does not literally mean your kidneys are working at exactly 30 percent.

Using eGFR as a direct percentage can be misleading.

How Is Kidney Disease Treated?

Treatment depends on:

• The cause
• eGFR
• UACR
• Blood pressure
• Diabetes status
• Heart disease
• Potassium
• Symptoms
• Risk of progression

Read Kidney Disease Treatment for a detailed treatment guide.

Control Blood Pressure

High blood pressure can both cause and worsen CKD.

A kidney care plan may include:

• Home blood pressure monitoring
• Less sodium
• Physical activity
• Weight management when appropriate
• Prescribed blood pressure medicines

Your blood pressure target should be individualized by your healthcare team.

ACE Inhibitors and ARBs

ACE inhibitors and ARBs can reduce blood pressure and urine albumin.

They can help slow CKD progression in many people with albuminuria.

These medicines may require monitoring of:

• Creatinine
• eGFR
• Potassium
• Blood pressure

Do not start, stop, or combine these medicines without medical guidance.

SGLT2 Inhibitors

SGLT2 inhibitors are now important kidney protective medicines for many people with CKD.

They were first used for type 2 diabetes, but kidney benefits extend to many people with CKD even when diabetes is not present.

They can lower the risk of:

• CKD progression
• Kidney failure
• Heart failure hospitalization
• Some cardiovascular events

They are not suitable for everyone, so the decision depends on eGFR, albuminuria, other conditions, and medication safety.

Other Kidney Protective Medicines

Some people with diabetes and CKD may benefit from other medicines, including selected:

• Nonsteroidal mineralocorticoid receptor antagonists such as finerenone
• GLP 1 based medicines
• Cholesterol lowering medicines

These are prescription treatments and require individual assessment.

Diabetes Control Matters

If diabetes is present, managing blood glucose helps protect the kidneys and other organs.

The best A1C goal is not identical for everyone.

It may depend on:

• Age
• CKD stage
• Hypoglycemia risk
• Other diseases
• Medicines

See Type 2 Diabetes and Diabetes and Blood Sugar Management.

Kidney Disease and Sodium

Too much sodium can increase:

• Blood pressure
• Fluid retention
• Swelling

A general target often used is no more than about 2,300 mg of sodium per day, although your personal target may be different.

Most sodium comes from processed and restaurant food, not just the salt shaker.

Kidney Disease and Protein

Protein needs depend on CKD stage and whether you receive dialysis.

For many adults with nondialysis CKD, excessive protein intake is discouraged.

Too little protein can also cause muscle loss and malnutrition.

People receiving dialysis often need more protein because dialysis removes amino acids and protein.

Should Everyone With CKD Avoid Potassium?

No.

Do not automatically remove bananas, tomatoes, beans, potatoes, oranges, or other potassium containing foods simply because you have CKD.

Potassium restriction depends on:

• Your blood potassium
• Medicines
• CKD stage
• Dialysis
• Other medical conditions

Too little potassium can also be harmful.

Should Everyone With CKD Avoid Phosphorus?

No.

Phosphorus restriction is mainly needed when laboratory values, CKD stage, or treatment indicate a problem.

When phosphorus needs to be reduced, one useful first step can be limiting processed foods containing phosphorus additives.

How Much Water Should You Drink With Kidney Disease?

There is no universal amount.

Drinking excessive water does not wash away chronic kidney damage.

Your fluid needs depend on:

• CKD stage
• Swelling
• Heart function
• Urine output
• Dialysis
• Climate and activity

Some people need normal fluid intake, while others require a restriction.

Avoid Kidney Detoxes

No tea, juice, herb, supplement, or cleanse has been proven to repair chronic kidney damage.

Some herbal products can:

• Damage kidneys
• Contain unsafe contaminants
• Raise potassium
• Interact with prescription medicines

Tell your care team about every supplement you use.

Kidney Safe Medicine Habits

Keep an updated list of:

• Prescription medicines
• Over the counter medicines
• Vitamins
• Minerals
• Herbal supplements

Kidney disease can change how quickly medicines leave the body.

Some medicine doses therefore need to be reduced as eGFR falls.

Be Careful With NSAIDs

NSAIDs such as ibuprofen and naproxen can reduce kidney blood flow.

The risk becomes higher with:

• CKD
• Dehydration
• Heart failure
• Older age
• Some blood pressure medicines
• Diuretics

Do not self treat frequent pain with NSAIDs if you have CKD without asking a healthcare professional first.

Daily Kidney Care Checklist

1. Know your eGFR.
2. Know your UACR.
3. Track the trend, not one result alone.
4. Control blood pressure.
5. Manage diabetes when present.
6. Take prescribed kidney protective medicines.
7. Reduce excess sodium.
8. Avoid unnecessary NSAIDs.
9. Do not smoke.
10. Stay physically active as advised.
11. Maintain a healthy eating pattern.
12. Review medicines and supplements regularly.

Does Exercise Help?

Physical activity supports:

• Blood pressure
• Blood sugar
• Heart health
• Muscle strength
• Weight management
• Mental health

The right activity depends on your health and kidney stage.

People with advanced CKD, heart disease, severe anemia, or major weakness may need an individualized plan.

Smoking and Kidney Disease

Smoking damages blood vessels and raises cardiovascular risk.

Stopping smoking supports both kidney and heart health.

If quitting is difficult, ask about counseling, medicines, and other evidence based support.

Complications of Advanced CKD

As kidney function declines, complications may include:

• Anemia
• High potassium
• Metabolic acidosis
• Fluid overload
• High blood pressure
• Mineral and bone disorder
• Malnutrition
• Itching
• Heart disease

These problems require specific treatment rather than one generic kidney supplement.

When Should You See a Nephrologist?

A kidney specialist may be especially helpful when there is:

• Rapid loss of kidney function
• Stage G4 or G5 CKD
• Heavy albuminuria
• Unexplained blood in urine
• Resistant high blood pressure
• Recurrent high potassium
• Suspected inherited kidney disease
• Unclear cause of CKD
• Need for dialysis or transplant planning

When Is Dialysis Needed?

Dialysis is considered when the kidneys can no longer keep the body safely balanced.

The decision is based on symptoms and complications, not only eGFR.

Reasons may include:

• Severe fluid overload
• Dangerous high potassium
• Severe acidosis
• Uremic symptoms
• Pericarditis
• Severe nausea or poor nutrition related to kidney failure

Dialysis Is Not the Only Kidney Failure Option

Kidney failure care can include:

• Hemodialysis
• Peritoneal dialysis
• Kidney transplantation
• Conservative kidney management in selected people

The best choice depends on health, goals, lifestyle, transplant eligibility, and personal preferences.

When Is Kidney Disease an Emergency?

Seek urgent medical help for:

• Severe trouble breathing
• Chest pain
• Collapse or fainting
• Marked confusion
• Almost no urine
• Rapidly worsening swelling
• Persistent vomiting
• Severe weakness or abnormal heartbeat symptoms
• Sudden severe illness with known kidney disease

Common Kidney Disease Myths

Conclusion: Protect Your Health With Kidney Disease Care

Kidney disease often develops quietly, which is why testing matters more than waiting for symptoms.

Know your eGFR and UACR, manage diabetes and blood pressure, take prescribed kidney protective medicines, avoid unnecessary NSAIDs, and use a food plan that fits your actual laboratory results.

If your kidney numbers are changing, ask what is causing the change, what your GFR and albumin categories are, and what you can do now to protect remaining kidney function.

Early detection and consistent care can make a meaningful difference.

References and Sources

1. KDIGO. 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease.
   Current international guideline covering CKD definition, classification, risk assessment, medicines, monitoring, progression, complications, and patient centered care.
   https://kdigo.org/guidelines/ckd-evaluation-and-management/
2. National Institute of Diabetes and Digestive and Kidney Diseases. Chronic Kidney Disease.
   Covers CKD causes, tests, diagnosis, risk factors, management, and progression.
   https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd
3. NIDDK. Chronic Kidney Disease Tests and Diagnosis.
   Covers eGFR, urine albumin, UACR, kidney failure ranges, and monitoring.
   https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/tests-diagnosis
4. National Kidney Foundation. How to Classify CKD.
   Covers G1 through G5 kidney function categories and A1 through A3 albuminuria categories.
   https://www.kidney.org/how-to-classify-ckd
5. NIDDK. Managing Chronic Kidney Disease.
   Covers blood pressure, diabetes, medicines, diet, activity, smoking, weight, sleep, and CKD monitoring.
   https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/managing
6. NIDDK. Healthy Eating for Adults With Chronic Kidney Disease.
   Covers sodium, protein, potassium, phosphorus, nutrition, and individualized kidney diets.
   https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/healthy-eating-adults-chronic-kidney-disease
7. National Kidney Foundation. SGLT2 Inhibitors.
   Covers kidney and cardiovascular protection in CKD, including benefits that can extend beyond diabetes.
   https://www.kidney.org/kidney-topics/sglt2-inhibitors

Internal Links and Helpful NextFitLife Guides

• Kidney Disease Treatment: Tests, Medicines, Diet and Daily Care
• Kidney Disease Symptoms: Early Signs, Tests and Red Flags
• Diabetes and Kidney Disease
• Kidney Healthy Foods
• Diet for Kidney Disease
• DASH Diet
• Type 2 Diabetes
• Diabetes and Blood Sugar Management
• Heart Healthy Foods and Blood Pressure Guide
• NextFitLife Health Hub

Frequently Asked Questions

What is kidney disease?

Kidney disease means the kidneys have structural damage or cannot filter blood normally. Chronic kidney disease generally lasts for at least three months.

What are the first symptoms of kidney disease?

Early chronic kidney disease often causes no symptoms. Blood and urine tests may find kidney damage before a person feels sick.

What are common symptoms of advanced kidney disease?

Advanced CKD can cause swelling, fatigue, poor appetite, nausea, itching, muscle cramps, sleep problems, concentration difficulty, urine changes, and shortness of breath.

What is eGFR?

eGFR is an estimate of how well the kidneys filter blood. It is usually calculated from serum creatinine and other patient information.

Is eGFR a percentage?

No. eGFR is a filtration estimate reported in milliliters per minute per 1.73 square meters, not a direct percentage of kidney function.

What is UACR?

UACR is the urine albumin to creatinine ratio. It measures albumin leaking into urine and helps detect and classify kidney damage.

Does one low eGFR mean chronic kidney disease?

No. CKD generally requires reduced kidney function or another marker of kidney damage that persists for at least three months.

What are the stages of chronic kidney disease?

CKD uses GFR categories G1, G2, G3a, G3b, G4, and G5. Risk assessment also uses urine albumin categories A1, A2, and A3.

What is stage G3 kidney disease?

G3 is divided into G3a with eGFR 45 to 59 and G3b with eGFR 30 to 44.

What is stage G4 kidney disease?

Stage G4 CKD means an eGFR from 15 to 29 that persists in chronic disease. It represents severe loss of kidney filtration.

What is stage G5 kidney disease?

Stage G5 means eGFR below 15 and is classified as kidney failure. Dialysis is not started from eGFR alone.

What causes chronic kidney disease?

Common causes include diabetes, high blood pressure, glomerular diseases, inherited kidney disorders, autoimmune disease, urinary obstruction, and previous kidney injury.

Can diabetes cause kidney disease?

Yes. High blood glucose can damage the small blood vessels in the kidneys and is one of the leading causes of CKD.

Can high blood pressure cause kidney disease?

Yes. High blood pressure can damage kidney blood vessels, and kidney disease can also make blood pressure rise.

Can kidney disease be reversed?

Some acute kidney problems can improve, but established chronic kidney damage is often not fully reversible. Treatment focuses on slowing progression and managing complications.

Can kidney disease be slowed?

Often, yes. Blood pressure control, diabetes management, kidney protective medicines, safe nutrition, smoking cessation, and medicine review can help slow progression in many people.

Should everyone with kidney disease avoid potassium?

No. Potassium restriction should be based on blood potassium, medicines, CKD stage, and individual medical needs.

How much water should a person with kidney disease drink?

There is no universal amount. Fluid needs depend on kidney function, urine output, swelling, heart health, dialysis, climate, and other factors.

Are ibuprofen and naproxen safe with kidney disease?

NSAIDs such as ibuprofen and naproxen can reduce kidney blood flow and may worsen CKD or cause acute kidney injury. People with CKD should ask a healthcare professional before using them.

When is kidney disease an emergency?

Seek urgent care for severe trouble breathing, chest pain, fainting, marked confusion, almost no urine, rapidly worsening swelling, persistent vomiting, or severe weakness with abnormal heartbeat symptoms.