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Published on: 8/20/2026

Can pus in the urethra cause smelly urine?

Yoshinori Abe

Reviewed by Yoshinori Abe, MD

Internal Medicine

Pus in the urethra is a common cause of smelly urine and typically signals an underlying infection, such as a urinary tract infection (UTI) or a sexually transmitted infection (STI). These infections trigger inflammation and discharge, which can alter the odor, color, and clarity of urine. Other symptoms may include burning during urination, pelvic discomfort, or increased urgency.

Because pus and foul-smelling urine can point to several different conditions—some requiring prompt treatment—it's important to identify the cause quickly. Taking a free, instant, online symptom check can help you understand your symptoms, narrow down possible causes, and guide your next steps toward the right care.

Reviewed for medical accuracy: 07/15/2026

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Explanation

When pus is present in the urethra, it usually indicates an infection, such as a urinary tract infection (UTI). UTIs can cause urine to have a strong or unpleasant smell. The presence of bacteria and white blood cells in the urine, which are part of the body's response to infection, can alter the typical odor of urine.

Key Points:

  1. Infections: Pus is often a sign of infection. Infections like UTIs can lead to changes in urine smell.
  2. Bacteria: Certain bacteria, like Aerococcus urinae, can be responsible for malodorous urine.
  3. Urinalysis: A urinalysis can help identify the cause of smelly urine by detecting bacteria or other substances in the urine.

If you notice a persistent change in urine odor, you can use Ubie's free AI symptom checker to help identify potential causes and determine whether you should consult a healthcare professional for further evaluation and appropriate treatment.

(References)

  • Midthun SJ, Paur R, & Lindseth G. (2004). Urinary tract infections. Does the smell really tell?. Journal of gerontological nursing, 15227931.

  • Lenherr N, Berndt A, Ritz N, & Rudin C. (2014). Aerococcus urinae: a possible reason for malodorous urine .... European journal of pediatrics, 24913181.

  • Simerville JA, Maxted WC, & Pahira JJ. (2005). Urinalysis: a comprehensive review. American family physician, 15791892.

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