Foul Smelling Urine: Causes, Symptoms, Diagnosis, Treatment & Home Remedies

Introduction

Urine usually has a mild smell; however, you may sometimes notice a change in its odour. In most cases, it is usually harmless and temporary. However, in some situations, it may be a sign of an underlying health problem¹.

Foul-smelling urine can occur with or without pain or other symptoms. Sometimes, it is caused by simple things like not drinking enough water or eating certain foods. In other cases, it may be due to an infection or a medical condition that needs attention. Since the causes can vary, it is important to understand what your body is trying to indicate¹.

In this blog, we will explore the common causes of foul-smelling urine, the symptoms to watch out for, how it is diagnosed, available treatment options, and simple home care tips that may help manage the problem. 

What Is Foul-Smelling Urine?

Foul-smelling urine is urine with a strong, unusual, or unpleasant odour. This change in odour occurs when certain constituents in urine become more concentrated or when unusual substances are present. 

Urine may smell foul for a variety of reasons, such as dehydration, specific foods, supplements, certain medications, urinary tract infection (UTI), or medical problems that affect waste processing in the body. In most instances, a temporary change in urine odour is not a cause for worry. However, it may be worrying if the bad odour persists for several days, returns, or is accompanied by symptoms such as burning during urination, discomfort, fever, or blood in the urine^1,2. In such cases, it is important to visit a doctor to determine the cause and receive appropriate treatment. 

Causes of Foul-Smelling Urine

Common Causes 

Some common causes of foul-smelling urine include: 

• Dehydration: Not drinking enough water concentrates the urine, leading to a strong ammonia-like smell¹.
• Dietary changes: Consuming certain foods and drinks such as asparagus, beer, garlic, and coffee can temporarily make the urine smelly².
• Medicines and supplements: Some medicines like valproate³ and certain vitamin and mineral supplements can cause smelly urine².

Medical Conditions 

Health conditions that may cause foul-smelling urine include: 

• UTIs: A bacterial infection in the urinary tract (e.g., bladder or kidney infection) can cause foul-smelling urine^1,2.
• Bladder fistula: An abnormal connection between the bladder and another organ (intestine, vagina, or skin) can give rise to a foul smell in the urine^1,2. 
• Diabetes: Poorly managed diabetes can lead to a fruity-smelling urine due to the presence of ketones (when the body fails to use sugar properly due to low insulin, it breaks down fat instead, producing ketones that give the urine a fruity smell)².
• Liver disease: Severe liver diseases can cause a musty or fruity smell in urine⁴. 
• Metabolic disorders: Certain rare metabolic disorders such as maple syrup urine disease (MSUD) can cause foul-smelling urine as the body cannot digest certain amino acids (such as leucine and isoleucine)⁵.
• Sexually transmitted infections (STIs): STIs like trichomoniasis can lead to foul-smelling urine⁶.
• Kidney stones: Kidney stones can cause foul-smelling urine as they can lead to blockage in the urinary tract and infection².

These health conditions require medical attention, and it is essential to consult a doctor if you suspect you have any of these conditions. 

• Causes of Foul-Smelling Urine in Females: 
  • Vaginal infection: Vaginal infections produce a foul-smelling vaginal discharge, which can mix with urine, causing the urine to also have an unpleasant smell⁷.
  • Pregnancy: Some women may develop diabetes and UTIs during pregnancy⁸. Both these conditions can contribute to smelly urine¹.
• Cause of Foul-Smelling Urine in Men: 
  • Prostatitis: Inflammation/ infection of the prostate gland can cause foul-smelling urine due to the presence of bacteria associated with the infection⁹.

Foul-Smelling Urine Symptoms

The foul-smelling urine itself is a symptom that may be associated with other symptoms based on its cause. These associated symptoms include: 

• Burning sensation during urination^1,2
• Frequent urge to urinate 
• Cloudy or dark-coloured urine⁶
• Blood in urine 
• Pain or discomfort in the lower abdomen or back¹
• Fever or chills¹
• Unusual or foul-smelling vaginal or penile discharge^6,7
• Foamy urine (sometimes seen in kidney-related issues) 

How Is Foul-Smelling Urine Diagnosed?

To identify the cause of smelly urine, your doctor will conduct a physical examination, discuss your medical history, and recommend certain diagnostic tests, as follows: 

1. Physical Examination 

A physical examination is done to look for signs of infection or other health issues. The doctor may check for pain in the lower abdomen, back, or kidney area and may also look for signs of dehydration or genital infections. 

2. Vaginal and Prostate Examination 

This examination is done as a part of physical examination as needed if the doctor suspects a vaginal infection or prostate issue: 

• In women, a pelvic or vaginal examination may be conducted to detect infections such as bacterial vaginosis or yeast infections. These disorders can induce abnormal discharge, which may mix with urine and result in a bad odour⁷.
• In men, a prostate examination may be done by inserting a lubricated, gloved finger through the rectum. This helps detect changes in the prostate due to infection, which may cause foul-smelling urine⁹. 

3. Medical History 

The doctor might first enquire about the symptoms, lifestyle, diet, water intake, and medical history. Information about symptoms such as burning while urinating, frequency of urination, fever, or recent infections can help the doctor determine the cause of the bad odour². A history of diabetes, kidney disease, or sexual activity may also be relevant. 

4. Urine Analysis 

This is the most commonly done test. A urine sample is tested in a laboratory to help determine any abnormalities in the urine, such as infection, bacteria, crystals, sugar, and other unusual compounds, and whether the bad smell in urine may be caused by any of these¹⁰.

5. Urine Culture 

This test is performed to determine the specific type of bacteria causing the infection. A urine culture test helps identify the specific germ causing infection. It also helps the doctor select the most effective antibiotic for treatment¹¹.

6. Blood Tests 

Blood tests can be used to diagnose underlying health issues such as diabetes, kidney disease, or infections. They aid in determining how effectively the kidneys are functioning and whether there are any signs of infection or other disorders that impact urine smell¹².

7. Imaging Tests 

Ultrasound or CT scans are utilised to obtain a clear image of the kidneys, bladder, and urinary system. These tests can help identify kidney stones, obstructions, and other structural issues that may cause foul-smelling urine¹³. 

Once the cause is identified, more specific tests may be performed to confirm the condition. 

Treatment of Foul-Smelling Urine

Urine can become smelly for various reasons. Therefore, treating the exact cause is important. Your doctor might recommend one of the below-given treatment options based on your health condition. 

• Antibiotics: These medicines are used when the smelly urine is caused by bacterial infections (such as UTIs), kidney stones associated with infection, prostatitis, or vaginal infections. They work by killing or inhibiting the bacteria responsible for the infection⁷. Your doctor will prescribe antibiotics like nitrofurantoin and trimethoprim if an infection is detected. 
• Antifungal Medication: These medicines are used when the cause is fungal infections, such as a vaginal infection caused by yeast. Treating the infection helps reduce discharge and urinary changes that may cause bad odour¹⁴. Antifungal medicines include fluconazole, amphotericin B, and flucytosine. 
• Diabetes Management: Good blood sugar control helps avoid complications like infections and diabetic ketoacidosis, both of which can affect urine smell². Proper diabetes management improves overall urinary health. The doctor may recommend insulin or tablets for blood sugar control. 
• Medication Adjustment: Modification of medications and dietary supplements may help reduce the accumulation of excess substances in urine, which can contribute to foul-smelling urine².
• Surgery: Surgical interventions may be required to remove kidney stones or correct urinary tract abnormalities (in case medicines do not work). Treatment of these underlying causes may help manage foul-smelling urine¹³. 
• Managing Medical Conditions: Managing medical conditions such as kidney disease or liver problems may help reduce foul-smelling urine caused by these conditions^1,2.

Note: Treatment options for foul-smelling urine depend on the underlying cause and individual patient conditions. Always consult a qualified healthcare professional for accurate diagnosis and proper management. Do not use medications without consulting a doctor first. 

Home Remedies for Foul-Smelling Urine

Some simple home care tips may help manage foul-smelling urine and support overall urinary health include: 

1. Drink Plenty of Water

Staying hydrated helps to dilute urine and flush out bacteria, toxins, and waste from the body¹⁵.This might lower strong odours and promote urinary health. 

2. Maintain Good Personal Hygiene

Hygiene habits like washing your genitals regularly helps avoid bacterial accumulation and infections that can result in foul-smelling urine. Also, avoid using harsh chemicals or strong smelling products on your genital regions⁷. 

3. Avoid Strong-Smelling Foods 

Avoiding strong-smelling foods like asparagus, beer, garlic, and coffee can reduce the foul smell of urine².

4. Include Probiotics in Diet

Consuming foods like curd and yoghurt that include beneficial bacteria can contribute to a healthy urinary and digestive system¹⁶. This might lower the likelihood of infections that produce foul urine odour. 

5. Consume Cranberry Juice 

Some studies indicate that consuming cranberry juice may help avoid bacteria from sticking to the urinary tract walls, reducing the risk of urinary tract infections¹⁷. However, more research is needed to confirm the effect of cranberry juice on UTIs. 

6. Maintain Blood Sugar Levels

Reducing sugar consumption and taking other measures to reduce blood levels might help avoid diabetic ketoacidosis, thereby avoiding smelly urine².

Note: The above-mentioned home care tips are general suggestions that may help reduce foul-smelling urine in mild or temporary cases. They should not be used in place of medical advice or treatment. If your symptoms persist, worsen, or are accompanied by pain, fever, or other unusual signs, it is important to consult a doctor for proper evaluation and treatment. Not seeking proper medical advice at the right time can worsen the condition and affect your overall health. 

Also Read: Leukocytes in Urine: Causes, Symptoms, Treatment & Prevention Tips 

When to Consult a Doctor?

Foul-smelling urine may be temporary and harmless; however, in some cases, it may indicate an underlying medical problem that needs attention. You should seek medical advice if you have foul-smelling urine that is accompanied by symptoms such as: 

• Burning sensation during urination^1,2
• Frequent urination 
• Fever or chills²
• Pain in the abdomen or back²
• Unusual vaginal or penile discharge^6,7
• Blood in the urine¹ 
• Cloudy urine⁶
• Signs of dehydration¹, such as dark urine, increased thirst, and dry skin 
• Signs of uncontrolled diabetes¹, such as blurred vision, low energy, and recurrent infections 

Individuals with existing kidney or liver conditions should consult a doctor without delay if symptoms appear. Ignoring these symptoms may worsen the condition and affect overall health. 

Conclusion

Foul-smelling urine may be caused by everyday factors such as diet, dehydration, or certain medicines and may be easily manageable. However, in certain circumstances, it could indicate underlying infections or medical issues that require immediate attention. Early diagnosis and treatment can help avoid problems and maintain good urinary health. If symptoms persist or worsen, you should consult a doctor. 

Also Read: Crystals in Urine: Types, Causes, Symptoms & When to Worry

Frequently Asked Questions (FAQs)

References

1. Urine odor. 2025. Available from: https://medlineplus.gov/ency/article/007298.htm 

2. Smelly urine. Available from: https://www.nidirect.gov.uk/conditions/smelly-urine 

3. Pupko HA. Possible new clinical sign of hyperammonemia. Canadian Medical Association Journal. 2007;178(3):326-326. doi:10.1503/cmaj.1070139. Available from: https://pubmed.ncbi.nlm.nih.gov/18227455/

4. Osborne BV. A nose for trouble. Br J Gen Pract. 2012;62(605):652-653. doi:10.3399/bjgp12X659394. Available from: https://europepmc.org/article/pmc/pmc3505402

5. Maple syrup urine disease. 2025. Available from: https://medlineplus.gov/ency/article/000373.htm 

6. Schumann JA, Plasner S. Trichomoniasis. 2023. Available from: https://www.ncbi.nlm.nih.gov/books/NBK534826/ 

7. Bishop GB. Chapter 172Vaginal Discharge. Available from: https://www.ncbi.nlm.nih.gov/books/NBK281/ 

8. Yefet E, Bejerano A, Iskander R, Zilberman Kimhi T, Nachum Z. The Association between Gestational Diabetes Mellitus and Infections in Pregnancy—Systematic Review and Meta-Analysis. Microorganisms. 2023;11(8):1956. doi:10.3390/microorganisms11081956. Available: https://pubmed.ncbi.nlm.nih.gov/37630515/

9. Prostatitis – bacterial. 2025. Available from: https://medlineplus.gov/ency/article/000519.htm 

10. Urinalysis. 2024. Available from: https://medlineplus.gov/urinalysis.html 

11. Urine culture. 2024. Available from: https://medlineplus.gov/ency/article/003751.htm 

12. What You Need to Know About Blood Testing. 2024. Available from: https://medlineplus.gov/lab-tests/what-you-need-to-know-about-blood-testing/ 

13. Urinary Tract Imaging. Available from: https://www.niddk.nih.gov/health-information/diagnostic-tests/urinary-tract-imaging 

14. Allen U. Antifungal agents for the treatment of systemic fungal infections in children. Paediatr Child Health. 2010;15(9):603-615. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC3009569/ 

15. About Water and Healthier Drinks. 2026. Available from: https://www.cdc.gov/healthy-weight-growth/water-healthy-drinks/index.html 

16. Saraiva A, Raheem D, Roy PR, et al. Probiotics and Plant-Based Foods as Preventive Agents of Urinary Tract Infection: A Narrative Review of Possible Mechanisms Related to Health. Nutrients. 2025;17(6):986. doi:10.3390/nu17060986. Available from: https://www.mdpi.com/2072-6643/17/6/986

17. Hisano M, Bruschini H, Nicodemo AC, Srougi M. Cranberries and lower urinary tract infection prevention. Clinics. 2012;67(6):661-667. doi:10.6061/clinics/2012(06)18. Available from: https://pubmed.ncbi.nlm.nih.gov/22760907/

18. Hur E, Gungor O, Bozkurt D, et al. Trimethylaminuria (fish malodour syndrome) in chronic renal failure. Hippokratia. 2012;16(1):83-85. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC3738402/

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