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Published on: 8/20/2026
Pus in the urine, medically known as pyuria, typically indicates a urinary tract infection (UTI) caused by bacteria such as E. coli. Other possible causes include kidney infections, bladder inflammation, sexually transmitted infections, or, less commonly, sterile pyuria from conditions like kidney stones or tuberculosis.
Because pyuria can stem from several different conditions—some mild, others requiring urgent care—identifying the underlying cause quickly matters. A free, instant, online symptom check can help you clarify what may be driving your symptoms, suggest possible conditions to discuss with a doctor, and guide your next steps with confidence.
Reviewed for medical accuracy: 07/15/2026
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Pus in urine, or pyuria, occurs when there are white blood cells in the urine. This is often a sign of an infection, especially in the urinary tract. According to the study by Rahman et al., pyuria is important for diagnosing urinary tract infections (UTIs), as it shows the body's response to bacteria in the urinary system.
One common cause of these infections is the bacteria E. coli, as discussed in the research by Mathieu et al. E. coli is a type of bacteria that can cause infections in the lower urinary tract, leading to symptoms like burning during urination, frequent urges to urinate, and cloudy or strong-smelling urine.
Both studies highlight the link between pus in urine and bacterial infections, emphasizing the importance of recognizing these symptoms for proper diagnosis and treatment. If you're experiencing symptoms of a UTI, you can check your symptoms with Ubie's free AI-powered tool to better understand what might be causing them and determine if you need to see a healthcare provider for evaluation and appropriate care.
(References)
Rahman AJ, Naz F, & Ashraf S. (2011). Significance of pyuria in the diagnosis of urinary tract .... JPMA. The Journal of the Pakistan Medical Association, 22368908.
Mathieu D, Jacques L, Auer J, & Bizzini B. (1988). E. coli infections of the lower urinary tract and their .... Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie, 3056533.
Kori R, Bains L, & Jain SK. (2019). Intravesical gossypiboma: our experience and the need for .... BMJ case reports, 30709885.
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