Last updated: Apr 28, 2026Published on: Apr 28, 2026
Table of Contents
Introduction
Protein in urine, or proteinuria, is a common condition that can affect people of any age. Sometimes, it is temporary and not serious. However, if it persists or occurs in large amounts, it may indicate an underlying health problem, especially related to the kidneys. The kidneys normally filter waste while keeping important substances like proteins in the blood. When they are not working properly, proteins can leak into the urine. This makes proteinuria an early sign of possible kidney disease1.
Early diagnosis is very important because it can help detect kidney problems or other health conditions at an early stage1.
This article can guide to better understand what proteinuria is, why it happens, its causes and symptoms, how it is diagnosed, and the available treatment options.
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What is Proteinuria?
Proteins are important substances that are essential to keep your body healthy. They help give you energy, build and repair muscles, and support your immune system. They can be seen throughout the body, including your blood1.
Your kidneys work like natural filters, cleaning your blood and getting rid of toxins. They keep important substances like proteins in your body while removing waste and extra fluids as urine. This filtering process is very careful, so useful things are not lost.
When the kidneys are affected by disease or when these filters get damaged, they may not work properly. As a result, proteins that should stay in the blood can leak into the urine. This condition is called proteinuria1.
The leakage of protein into the urine can also be due to other reasons like infections, high blood pressure (BP), diabetes, or even temporary conditions like stress, fever, or intense physical activity2.In some cases, proteinuria associated conditions may not cause any noticeable symptoms, especially in the early stages, which is why testing is important for detection1.
Reasons for Protein in Urine
Proteinuria can occur due to several reasons. The following are some of the most common proteinuria causes.
Kidney Disease: Conditions like chronic kidney disease (CKD), urinary tract infections (UTIs), nephrotic syndrome, etc., can damage the kidney filters. This damage allows protein to leak into the urine over time1,2.
Diabetes: High blood sugar can cause diabetic nephropathy. This leads to damage to the kidney’s filtering units (glomeruli), causing protein leakage in urine2.
Hypertension: Uncontrolled BP damages the blood vessels in the kidneys over time. This reduces their ability to filter properly, which can eventually lead to protein leaking into the urine and CKD3.
Autoimmune Disorders: In conditions like lupus or IgA nephropathy, the immune system attacks the kidney tissues. This causes inflammation and protein leakage4.
Heart Disease: Poor heart function reduces blood flow to the kidneys. This affects their ability to filter properly, leading to proteinuria2.
Multiple Myeloma & Blood Cancers: These cancers produce abnormal proteins that can pass into the urine. They may also damage the kidneys over time5.
Amyloidosis: A condition where abnormal proteins build up in different parts of the body. These proteins stick together and form deposits that can interfere with how organs normally work. This can cause proteinuria and affect kidney health6.
Medications: Certain drugs like painkillers or antibiotics can damage the kidneys if used long-term. This damage can cause protein to leak into the urine2.
Other Causes: Pregnancy, dehydration, fever, injury, alcohol consumption, etc2,7.
Protein in Urine Symptoms
Protein in urine often does not cause symptoms in the early stages. When symptoms do appear, they may indicate kidney problem or malnutrition caused by protein loss. These symptoms may include:
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Puffy eyelids and swelling in the body (mainly hands and feet)
Bloody or foamy urine
Weight changes (Mostly weight gain with swelling, sometimes weight loss if affected by malnutrition)
Numbness, dry skin or itching (these all are due to consequence of chronic malnutrition due to protein loss and not per se proteinuria)
Severe fatigue/ tiredness
Reduced or increased urination
Improper sleep
Difficulty in breathing
Difficulty focusing, concentrating, or processing thoughts1
Types of Proteinuria
Based on the duration, proteinuria can be classified into three
1. Transient Proteinuria
Transient proteinuria is a temporary condition. The protein is found in the urine for a short time, but it goes away once the cause is fixed or disappears. It usually does not mean there is permanent kidney damage. This can happen during short-term situations like fever, seizures, or after heavy exercise, when the body is under stress. It may also occur due to emotional stress, dehydration8, exposure to cold weather or pregnancy2. Sometimes, no obvious reason is found8.
2. Orthostatic Proteinuria
Orthostatic proteinuria is a common condition in children and teenagers, especially boys during adolescence. In this, protein appears in the urine only when the person has been standing or active for several hours. The exact cause is not fully known, but it may be related to changes in blood flow
in the left kidney due to slight pressure on a kidney vein when standing. It is usually a harmless condition and does not indicate any significant health problems8.
3. Persistent Proteinuria
Persistent proteinuria indicates the consistent presence of protein in urine. It usually indicates a kidney problem, most often involving the kidney’s filtering units (glomeruli). When these filters are damaged, proteins like albumin can leak into the urine8. Persistent proteinuria is associated with conditions such as glomerulonephritis, amyloidosis, hypertension, autoimmune disorders, diabetic nephropathy, myeloma, etc2.
How is Protein in Urine Diagnosed?
If you have symptoms associated with proteinuria, your doctor might recommend the following tests for you based on your condition:
Urine Dipstick Test: This is usually the first, simplest, and most commonly used test to check for protein in urine. It is quick, painless, and can be done in a clinic or laboratory within minutes. A specially treated chemical strip (dipstick) is dipped into a fresh urine sample. If protein is present, a chemical reaction causes the strip to change colour, which is then compared with a standard colour chart. It detects the presence of protein in urine, mainly albumin (the most common type of protein lost) and gives a quick result as negative or positive, or an approximate level, depending on protein concentration2.
Urine Protein-to-Creatinine Ratio (UPCR): This test is considered as more accurate and convenient to measure protein loss in urine. This is done using a single urine sample, preferably the first morning urine, which gives more accurate results. The test compares protein and creatinine levels to estimate how much protein is being lost in urine. If the UPCR value is higher than 15 mg/mmol, it may suggest a problem and needs further medical evaluation2.
24-Hour Urine Protein Test: In this test, all urine passed over a full 24-hour period is collected in a special container. This collection is very important because it captures every drop of urine produced in a day, giving an overall and accurate picture of protein loss. After collection, the sample is sent to the laboratory, where it is carefully analysed to measure the total amount of protein present in the urine. It measures the total quantity of protein excreted in urine over 24 hours, which helps doctors understand how much protein the kidneys are leaking in a day1. The table below shows the proteinuria levels based on the amount of protein lost in urine.
Category
24-hour Urine Protein
Protein/Creatinine Ratio (mmol)
Normal
Less than 150 mg/24 hours
Less than 15 mg/mmol
Mild-Moderate (Nephritic)
150-3000 mg/24 hours
12-300 mg/mmol
Severe (Nephrotic)
More than 3500 mg/24 hours
More than 350 mg/mmol
The table shows three levels of protein in urine based on how much protein is lost. Normal means only a small, healthy amount of protein is present. The nephritic range means there is a mild to moderate increase, which may suggest early kidney problems or inflammation. The nephrotic range means a very high protein loss, usually indicating serious kidney disease that needs medical care2.
Blood Tests: Your doctor might suggest several blood tests if you have proteinuria, to understand the causes. These tests include:
Serum creatinine test: Measures the level of creatinine, which is a waste produced in our body by muscle activity and digestion of protein in food. High creatinine levels may indicate kidney problems such as acute kidney injury or chronic kidney disease9. This can indicates poor filtration by the kidneys, which causes loss of protein in the urine.
Estimated glomerular filtration rate (eGFR): Shows how well the kidneys are filtering waste from the blood. It is calculated using blood creatinine levels, age, sex, and sometimes another marker called cystatin C. A higher eGFR means better kidney function, while a lower value means reduced kidney function. In general, an eGFR below 60 suggests kidney disease, and below 15 indicates kidney failure. However, it naturally decreases with age9.
Blood urea nitrogen (BUN) test: Measures BUN, which is a waste product formed when your body breaks down protein from food. If the kidneys are not working well, BUN levels can increase. However, BUN alone is not very useful, therefore, doctors usually interpret it along with creatinine and eGFR to assess kidney function9.
Serum protein electrophoresis: Measures different types of proteins in the blood by separating them into groups. It helps detect abnormal protein patterns linked to infections, kidney disease, autoimmune disorders, and certain blood cancers10.
Antinuclear antibody test (ANA): Measures antinuclear antibodies (ANA) in the blood, which may attack the body’s own cells. High levels can suggest autoimmune diseases such as lupus, rheumatoid arthritis, or scleroderma. However, the ANA test alone is not diagnostic, so results are interpreted along with symptoms and other tests11.
Protein in Urine Treatment
The following are some common treatment strategies used to deal with proteinuria:
Management of Blood Pressure: Controlling high blood pressure is essential to reduce protein loss and protect kidney function. Your doctor might prescribe medications such as ACE inhibitors or angiotensin receptor blockers (ARB), etc., to manage BP8.
Management of Diabetes: Maintaining good blood sugar control is important to avoid damage to kidney’s filtering units, glomeruli, which can otherwise become leaky. Your doctor might prescribe antidiabetic medications or insulin therapy or oral antidiabetic medicines like metformin or GLP-1 receptor agonists along with lifestyle modifications.
Managing Fluid retention: Maintaining fluid balance is important to avoid proteinuria. Your doctor might prescribe diuretics to remove excess fluid from your body2.
Others: Depending on the cause, your doctor might prescribe additional medications. These may include immunosuppressive drugs for kidney conditions like lupus nephritis, statins to manage cholesterol levels or antibiotics for infections like UTI12,13,14.
Note: Not all medicines are needed for everyone. Treatment varies from person to person and will be prescribed by your doctor based on your condition. Medicines should only be taken under the guidance of your doctor. Self-medication can harm your health or may not provide the expected effectiveness, if not taken with guidance.
How to Reduce Protein in Urine Naturally?
The following are some ways by which you may avoid protein loss:
Reduce Sodium Intake: Reducing fast food or processed food consumption (package foods), and foods which are high in salt (chips, pickles, etc.), is an effective way to lower blood pressure and ease the strain on the kidneys, which can help reduce protein loss in urine15.
Follow a Low-Protein or Plant-Based Diet: Limiting overall protein intake, particularly from animal sources, can reduce strain on the kidneys. Choosing plant-based proteins such as lentils and beans, along with increasing fibre intake, may help improve kidney health16and reduce protein loss.
Improve Hydration: Staying well hydrated supports normal kidney function and helps maintain the balance of fluids in your body, reducing the risk of protein loss in urine caused by dehydration2,17.
Exercise Regularly: Engaging in regular physical activity helps improve overall health, supports blood pressure and manage blood sugar levels, and contributes to better kidney function3. This might in turn reduce protein loss.
Maintain a Healthy Weight: Keeping your weight in a healthy range can lower your chances of problems like high blood pressure and diabetes3,18, which are common causes of protein in urine1.
Consume Antioxidant Rich Foods: Eating antioxidants rich food such as berries, whole-grains, nuts, leafy-greens, etc. can reduce inflammation and oxidative stress in kidney disease, which may help protect the kidneys19. This can thereby avoid protein loss by maintaining kidney health and lowering inflammation.
Manage Blood Sugar Level: Following a balanced diet with low sugar and refined carbohydrates, and including whole grains, vegetables, and high-fibre foods might help maintain normal blood glucose levels and help reduce the risk of proteinuria20.
Note: These suggestions are for general informational purposes only and are not a substitute for medical advice. Protein in urine may indicate an underlying health condition, so proper diagnosis and treatment should be done by a qualified healthcare professional. Always consult your doctor before making any dietary or lifestyle changes.
You should consult a doctor if protein in urine is detected in a test or if you notice symptoms that may indicate kidney problems. Early medical evaluation is important to prevent complications and identify the underlying cause.
Seek medical attention if you notice:
Persistent foamy urine
Swelling in the face, hands, feet, or ankles
Blood in urine or dark-coloured urine
Reduced or unusually frequent urination
Unexplained fatigue or weakness
Sudden weight gain due to fluid retention
Confusion, drowsiness, or difficulty thinking clearly
Even if there are no symptoms, repeated detection of protein in urine in routine tests should always be evaluated by a doctor, as it may be an early sign of kidney disease.
Conclusion
Protein in urine (proteinuria) is often an early sign that the kidneys may not be working properly. It can also occur due to infections, dehydration, or during pregnancy. In many cases, it is temporary, but persistent protein loss should not be ignored. Early testing and treatment can help protect kidney health and avoid serious complications. If you notice symptoms or abnormal test results, it is important to consult a doctor for proper evaluation.
Reasons for protein in urine can be many and certain types of diet can stress the kidneys or aggravate existing medical issues that can affect the kidneys. Eating too much red meat, processed foods like bacon and sausage, and foods high in salt or sugar can worsen kidney disease, which is a major cause of proteinuria2,3.
What does it mean when you have protein in your urine while pregnant?
Protein in urine during pregnancy is quite common. It can sometimes be harmless and temporary, but in other cases, it may indicate a more serious health problem such as preeclampsia (pregnancy condition marked by high blood pressure and protein in the urine, which can affect both the mother and baby if not treated) that needs medical attention21.
Can alcohol cause protein in urine?
Yes. Frequent consumption of high amounts of alcohol can cause proteinuria7.
Will drinking water reduce protein in urine?
Drinking water can reduce dehydration and help maintain fluid balance in your body by supporting kidney health17, thereby lowering the chances of protein loss. However, it may not stop protein loss caused by severe conditions like CKD.
Can protein in urine go back to normal?
Yes, protein in urine (proteinuria) can return to normal, depending on the cause. It is often temporary and may go away if it is caused by factors like dehydration, heavy exercise, stress, or fever2.
Can UTI cause protein in urine?
Yes, UTIs are known to cause temporary or transient protein loss2. However, it should not be ignored as it can even affect the kidney health and cause severe kidney problems if left untreated. A protein in urine test may help you know its severity.
Uehara S, Hayashi T, Kogawa Sato K, et al. Relationship Between Alcohol Drinking Pattern and Risk of Proteinuria: The Kansai Healthcare Study. J Epidemiol. 2016;26(9):464-470. doi:10.2188/jea.JE20150158. https://www.jstage.jst.go.jp/article/jea/26/9/26_JE20150158/_article
Busuioc R, Ștefan G, Stancu S, Zugravu A, Mircescu G. Nephrotic Syndrome and Statin Therapy: An Outcome Analysis. Medicina. 2023;59(3):512. doi:10.3390/medicina59030512. https://www.mdpi.com/1648-9144/59/3/512/notes
Kang SC, Kim HW, Chang TI, et al. Reduction in proteinuria after immunosuppressive therapy and long-term kidney outcomes in patients with immunoglobulin A nephropathy. Korean J Intern Med. 2021;36(5):1169-1180. doi:10.3904/kjim.2020.240. https://www.kjim.org/upload/kjim-2020-240.pdf
Swift PA, Markandu ND, Sagnella GA, He FJ, MacGregor GA. Modest Salt Reduction Reduces Blood Pressure and Urine Protein Excretion in Black Hypertensives: A Randomized Control Trial. Hypertension. 2005;46(2):308-312. doi:10.1161/01.HYP.0000172662.12480.7f. https://pubmed.ncbi.nlm.nih.gov/15983240/
Michail A, Andreou E. A Plant-Dominant Low-Protein Diet in Chronic Kidney Disease Management: A Narrative Review with Considerations for Cyprus. Nutrients. 2025;17(6):970. doi:10.3390/nu17060970. https://www.mdpi.com/2072-6643/17/6/970
Rahaman MdM, Hossain R, Herrera‐Bravo J, et al. Natural antioxidants from some fruits, seeds, foods, natural products, and associated health benefits: An update. Food Science & Nutrition. 2023;11(4):1657-1670. doi:10.1002/fsn3.3217. https://pmc.ncbi.nlm.nih.gov/articles/PMC10084981/
Airoldi J, Weinstein L. Clinical Significance of Proteinuria in Pregnancy: Obstetrical & Gynecological Survey. 2007;62(2):117-124. doi:10.1097/01.ogx.0000253301.55009.ac. https://pubmed.ncbi.nlm.nih.gov/17229328/
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