Cloudy Urine: Causes and When to Worry

What Does Cloudy Urine Mean?

Urine is normally clear and ranges from pale yellow to a deeper yellow depending on how concentrated it is. Cloudy urine looks less transparent and may be described as hazy, milky, or murky.

In laboratory or medical descriptions, cloudy urine may also be called turbid urine. “Turbid” simply describes how the urine looks. It is not a diagnosis and does not identify the cause.

Urine may become cloudy when it contains material such as:

• Bacteria or other microorganisms
• White blood cells
• Red blood cells
• Urinary crystals
• Mucus
• Other cells or suspended material

Because several different findings can affect urine clarity, it is usually not possible to determine the cause simply by looking at the urine.

Does Cloudy Urine Mean You Have a UTI?

Not necessarily. A urinary tract infection is one common reason urine can look cloudy, but cloudy urine by itself does not establish that an infection is present.

A bladder infection becomes more likely to be considered when cloudiness occurs together with symptoms such as burning during urination, frequent or intense urges to urinate, lower abdominal discomfort, or urine with a strong or unusual odor.

Crystals, kidney stones, mucus, cells, or other material can also affect urine clarity without a bladder infection.

For a closer comparison, see Cloudy Urine vs UTI.

Common Causes of Cloudy Urine

Urinary tract infection (UTI)

A bladder infection can cause cloudy urine and may also cause burning during urination, frequent or urgent urination, lower abdominal discomfort, or strong-smelling urine.

These symptoms do not prove that an infection is present, but the combination is more informative than cloudiness alone. Urine testing may be appropriate when a UTI is suspected.

Learn more about Urinary Tract Infections (UTIs).

Crystals and urinary sediment

Urine contains dissolved minerals and other substances. Under certain conditions, some of these substances can form crystals.

A small amount of certain crystals may occur in healthy urine. Larger amounts or particular types of crystals may be associated with kidney stones, urinary tract infections, medicines, diet, or metabolic conditions.

What looks like sediment may also consist of crystals, mucus, cells, or other material. A laboratory examination is more reliable than appearance alone for determining what is actually present.

Kidney stones

Kidney stones can occur with cloudy or bad-smelling urine. When a stone causes symptoms, there may also be sharp or severe pain in the back, side, lower abdomen, or groin, blood in the urine, painful urination, nausea, or vomiting.

See Kidney Stones for more information.

Mucus, cells, and sample contamination

Mucus and different types of cells may be seen during microscopic examination of urine and can contribute to an abnormal-looking sample.

Material from the skin or genital area can also contaminate a urine specimen during collection. When accurate testing is important, a healthcare professional may recommend a clean-catch urine sample to reduce this contamination.

Concentrated urine and low fluid intake

Low fluid intake usually makes urine more concentrated and darker in color. Not drinking enough fluids may also contribute to higher concentrations of some substances that can form urinary crystals.

However, persistent or recurrent cloudy urine should not automatically be attributed to dehydration, especially when burning, pain, fever, blood, or other urinary symptoms are present.

Other urinary tract conditions

Inflammation or other problems involving the urinary tract can sometimes change the appearance of urine. In these situations, associated symptoms and urine test results are usually more useful than cloudiness alone for identifying the likely cause.

What Other Symptoms May Mean

A useful way to think about cloudy urine is to look at the symptoms that occur with it.

These patterns can help guide evaluation, but they are not diagnoses. Different conditions can cause similar combinations of symptoms.

Common Cloudy Urine Situations

Cloudy urine with burning

Cloudy urine together with burning during urination, urgency, or frequent urination can occur with a bladder infection. But infection is not the only possible explanation for burning.

If painful or burning urination is your main concern, see Painful Urination.

Cloudy urine with sediment or particles

Particles in urine may be crystals, mucus, cells, or other material. Their appearance cannot reliably show what they are.

If sediment continues to appear or occurs with pain, blood, fever, or other urinary symptoms, a urinalysis can help clarify the cause.

Cloudy urine with a strong odor

Cloudy, strong-smelling urine can occur with a bladder infection, but odor alone is not specific enough to diagnose one.

Odor becomes more meaningful when it occurs with symptoms such as burning, urgency, frequent urination, lower abdominal discomfort, fever, or flank pain.

Cloudy urine without pain

Cloudy urine does not have to be painful. Crystals, mucus, cells, or other material can affect urine clarity without causing discomfort.

A lack of pain does not by itself show whether the change is important. Persistent or recurrent cloudiness, visible blood, fever, or new urinary symptoms should be discussed with a healthcare professional.

See Cloudy Urine With No Pain for more detail.

Cloudy urine in the morning

Morning urine is often more concentrated because several hours have passed without fluid intake. This can make changes in color or clarity easier to notice.

If cloudiness repeatedly occurs in the morning, persists during the day, or is accompanied by urinary symptoms, it should not automatically be assumed to be from overnight concentration.

See Cloudy Urine in the Morning.

Cloudy urine but no infection is found

A negative test for infection does not mean the urine could not have looked cloudy. Crystals, mucus, cells, kidney stones, specimen contamination, and other noninfectious explanations may still be possible.

If symptoms continue despite negative UTI testing, further evaluation should be based on the symptoms, medical history, and urine test findings rather than appearance alone.

See Cloudy Urine but No Infection.

How Cloudy Urine Is Evaluated

A brief change in urine appearance does not always require extensive testing. Whether evaluation is needed depends on how long the change lasts, whether it returns, and what other symptoms are present.

Medical history and symptoms

A healthcare professional may ask when the cloudiness began, whether it happens repeatedly, and whether you have burning, urinary urgency, frequent urination, fever, pain in the back or side, visible blood, nausea, vomiting, or other symptoms.

Previous UTIs, kidney stones, medications, recent urinary procedures, and other medical history may also be relevant.

Urinalysis

Urinalysis examines the physical, chemical, and microscopic characteristics of urine. It can assess whether the sample is clear or cloudy and can help identify findings such as blood, white blood cells, bacteria, crystals, mucus, and other substances.

Urine culture

When a bacterial urinary tract infection is suspected, a urine culture may be used to look for bacteria in the urine and help guide treatment decisions.

Additional testing

Additional tests are chosen according to the suspected cause rather than cloudiness itself. For example, imaging may be appropriate when symptoms suggest a kidney stone or another urinary tract problem.

Blood tests may be used when there is concern about a more serious infection or kidney function.

When to Seek Medical Care

A single change in urine appearance without other symptoms may not tell you much by itself. Medical evaluation becomes more important when cloudiness persists, keeps returning, or occurs with other urinary or systemic symptoms.

Contact a healthcare professional if:

• Cloudy urine persists or repeatedly returns
• You have burning or pain during urination
• You develop frequent or urgent urination
• You see blood in your urine
• You have persistent lower abdominal or pelvic discomfort
• An unusual urine odor occurs together with other urinary symptoms
• Your symptoms continue even though testing has not shown a UTI

If blood is visible, see our guide to Blood in Urine.

Seek prompt medical care if:

• You have fever or chills with pain in your back, side, or groin
• You have nausea or repeated vomiting along with urinary symptoms
• You develop severe back, side, abdominal, or groin pain
• You are unable to urinate or can pass only a very small amount of urine
• You feel seriously unwell or develop confusion, shortness of breath, or rapidly worsening symptoms

If you think you may be experiencing a medical emergency, contact local emergency services.

Common Questions About Cloudy Urine

Why is my urine cloudy?

Urine can appear cloudy when it contains bacteria, cells, crystals, mucus, or other material. A UTI and kidney stones are possible causes, but appearance alone cannot determine the reason.

Does cloudy urine always mean a UTI?

No. A UTI is one possible cause, especially when cloudy urine occurs with burning, frequent or urgent urination, lower abdominal discomfort, or a strong odor. Cloudiness by itself does not diagnose an infection.

Can dehydration cause cloudy urine?

Low fluid intake primarily makes urine more concentrated and darker. Not drinking enough fluids can also contribute to higher concentrations of some urinary crystals. Persistent cloudy urine should not automatically be blamed on dehydration, particularly when other symptoms are present.

What does “turbid” or “slightly turbid urine” mean?

“Turbid” means that the urine sample appears cloudy or less transparent than expected. “Slightly turbid” describes the degree of cloudiness; neither term identifies the cause.

Microscopic and chemical testing may be needed to determine whether cells, crystals, bacteria, mucus, or other substances are present.

What if my urine is cloudy but my UTI test is negative?

Not every case of cloudy urine is caused by infection. Crystals, mucus, cells, kidney stones, specimen contamination, and other causes may affect urine clarity. If symptoms continue, further evaluation depends on the overall clinical picture and test results.

Should I worry about cloudy urine in the morning?

Morning urine is often more concentrated, which can make changes in appearance more noticeable. Repeated cloudiness or cloudiness accompanied by burning, frequency, pain, blood, fever, or other symptoms deserves more attention.

Medical Sources and References

• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Symptoms & Causes of Bladder Infection in Adults.
• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Diagnosis of Bladder Infection in Adults.
• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Symptoms & Causes of Kidney Stones.
• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Symptoms & Causes of Kidney Infection (Pyelonephritis).
• MedlinePlus, U.S. National Library of Medicine. Urinalysis.
• MedlinePlus, U.S. National Library of Medicine. Crystals in Urine.

Medical Disclaimer

The information on this page is provided for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

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