How is cloudy smelly urine associated with pus in the urethra?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Cloudy, smelly urine along with pus discharge from the urethra is often a sign of a urinary tract infection (UTI) or urethritis. These symptoms occur when the body's immune system fights off bacteria or other pathogens, producing pus and altering the urine's color and odor. Common causes include bacterial UTIs, sexually transmitted infections (STIs) like gonorrhea or chlamydia, and prostatitis in men. Left untreated, these infections can spread to the kidneys or bloodstream, so identifying the cause early is important.

Because symptoms like these can stem from several different conditions, it's smart to get a clearer picture before deciding on next steps. Take a free, instant, online symptom check to better understand what may be causing your symptoms and how to move forward with confidence.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Cloudy, smelly urine and pus in the urethra often mean there is an infection in the urinary tract. When the body fights germs, it sends white blood cells to the area, which can lead to pus. This pus can mix with urine, making it look cloudy and smell bad.

Key Points:

Urinary Tract Infection (UTI): This is a common cause of cloudy and smelly urine. Infections can occur in different parts of the urinary system, like the bladder or urethra.
Pus Formation: The presence of pus indicates that white blood cells are trying to fight off an infection. This is a natural response by the body to protect itself.
Changes in Urine: When pus forms in urine, it can change the color and smell. This is why urine may appear cloudy and have a strong odor.

Understanding these changes can help in recognizing signs of a possible infection. If you're experiencing these symptoms, try our free AI symptom checker to better understand what might be causing your discomfort and whether you should seek medical attention for proper treatment.

(References)

Simerville JA, Maxted WC, & Pahira JJ. (2005). Urinalysis: a comprehensive review. American family physician, 15791892.
Farrelly E, Lindbo L, Wijkström H, & Seiger Å. (2020). The Stockholm Spinal Cord Uro Study: 2. Urinary tract .... Scandinavian journal of urology, 32148149.
Nisheljeet S, Azizi AB, Palaniandy K, Ganesan D, Ong TA, Alias A, et al. (2022). Survey on Untethering of the Spinal Cord and Urological .... Children (Basel, Switzerland), 35884073.

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