How is smelly urine associated with pus in the urethra?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Smelly urine can have several possible causes. One potential cause is a bacterial infection by Aerococcus urinae, which may also lead to pus in the urethra. Other common causes include dehydration, urinary tract infections (UTIs), certain foods, medications, and underlying medical conditions such as diabetes or liver disease.

Because foul-smelling urine can signal anything from mild dehydration to a treatable infection, identifying the cause early matters. A fast, free, and private symptom check can help you understand what may be behind your symptoms and guide your next steps—whether that's a simple lifestyle adjustment or a timely visit to your doctor.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Smelly urine and pus in the urethra can be signs of an infection. One possible cause of these symptoms is an infection with a bacteria called Aerococcus urinae. This bacteria can cause infections in the urinary tract, which includes the urethra, bladder, and kidneys.

How It Happens

Bacteria Invasion: Aerococcus urinae enters the urinary tract and starts to grow.
Infection Development: As the bacteria multiply, they can cause an infection.
Symptoms: This infection can lead to smelly urine and sometimes pus, which is a thick, white or yellow fluid, in the urethra.

Why It Smells

The bacteria produce substances that produce a strong smell, making the urine malodorous.

If you notice these symptoms, you can use a free symptom checker to help identify potential causes, but it is important to see a healthcare provider who can help determine the cause and the best treatment. Remember, only a healthcare provider can diagnose and treat medical conditions.

(References)

Lenherr N, Berndt A, Ritz N, & Rudin C. (2014). Aerococcus urinae: a possible reason for malodorous urine .... European journal of pediatrics, 24913181.
Dudani R, Qasem A, & Udom K. (2024). Aerococcus Urinae Infection Causing Malodorous Urine in .... Cureus, 38586679.
Skalidis T, Papaparaskevas J, Konstantinou D, Kapolou E, Falagas ME, & Legakis N. (2017). Aerococcus urinae, a cause of cystitis with malodorous .... JMM case reports, 28348806.

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