What are the visual characteristics of pus in urine?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Pus in the urine, a condition called pyuria, often causes urine to appear cloudy, milky, or murky. This cloudiness is caused by white blood cells (WBCs), which the body sends to fight infection. Pyuria is most commonly linked to urinary tract infections (UTIs), but it can also signal kidney infections, sexually transmitted infections, or other underlying issues that need medical attention.

Because cloudy urine can point to several possible causes—some minor, some serious—it's important not to guess. Taking a free, instant, online symptom check can help you quickly identify possible causes based on your specific symptoms and guide you on the right next steps, whether that's home care or seeing a doctor. It only takes a few minutes and could save you time, worry, and unnecessary complications.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Pus in urine, also known as pyuria, can cause the urine to appear cloudy or milky. This cloudiness is due to the presence of white blood cells, which are often there because of an infection in the urinary tract.

Visual Characteristics:

Cloudy or Milky Appearance: The urine may not be as clear as normal and can look like it has a white or murky tint.
Possible Sediment: Sometimes, you might notice small particles or sediment in the urine.

Possible Causes:

Infections: Infections in the urinary tract, such as a bladder infection, are common reasons for pus in urine.

These characteristics are important because they can help in identifying a potential infection that might need medical attention. If you notice these changes in your urine, you can use this free AI symptom checker to help understand your symptoms better, and consult with a healthcare provider for further evaluation.

(References)

Fazil Marickar YM, Salim A, & Vijay A. (2010). Stone symptoms and urinary deposits. Urological research, 19888570.
HOUSTON IB. (1963). PUS CELL AND BACTERIAL COUNTS IN THE .... Archives of disease in childhood, 14085891.
Ditchburn RK, & Ditchburn JS. (1990). A study of microscopical and chemical tests for the rapid .... The British journal of general practice : the journal of the Royal College of General Practitioners, 2271260.

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