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Published on: 8/20/2026

How is pus in the urine related to urinary tract infections?

Yoshinori Abe

Reviewed by Yoshinori Abe, MD

Internal Medicine

Pyuria, or pus in the urine, is most often caused by a urinary tract infection (UTI). UTIs are among the most common infections in both children and adults, but pyuria can also signal other underlying conditions such as kidney infections, sexually transmitted infections, or bladder inflammation.

Common causes of pus in urine include:

  • Urinary tract infections (UTIs)
  • Kidney infections (pyelonephritis)
  • Sexually transmitted infections (STIs)
  • Bladder or kidney stones
  • Interstitial cystitis

When to seek care: Symptoms like burning during urination, cloudy urine, pelvic pain, or fever alongside pyuria should not be ignored, as untreated infections can spread to the kidneys.

Because pyuria has many possible causes—some mild, some serious—identifying the right next step matters. Taking a free, instant, online symptom check can help you understand what may be behind your symptoms, how urgent they are, and which type of care to seek. It's a quick, private way to make informed decisions before booking an appointment or heading to urgent care.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Pyuria, or pus in the urine, is a common indicator of a urinary tract infection (UTI). UTIs occur when bacteria enter the urinary tract, leading to symptoms such as pain, frequent urination, and cloudy urine.

What is Pyuria?

  • Pyuria is the presence of white blood cells or pus in the urine.
  • It often indicates an infection or inflammation in the urinary tract.

How is it Related to UTIs?

  1. Infections: Pyuria is commonly seen in UTIs because the body sends white blood cells to fight off the infection.
  2. Symptoms: UTIs can cause symptoms like pain during urination, frequent urges to urinate, and cloudy or smelly urine due to pyuria.

Importance of Diagnosis

  • Children and Adults: Both children and adults can get UTIs, and pyuria is a useful sign for doctors to diagnose these infections.
  • Treatment: Identifying pyuria helps in starting the right treatment, usually antibiotics, to clear the infection.

Understanding the presence of pus in the urine is important for diagnosing and treating UTIs effectively. If you're experiencing symptoms like painful urination, frequent urges, or cloudy urine, you can check your symptoms with Ubie's free AI-powered tool to better understand your condition before seeking medical 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.

  • Brown DC, & Yang K. (1972). Childhood urinary tract infections in family practice. Canadian family physician Medecin de famille canadien, 20468715.

  • Chowdhary SK, Kolar M, & Yeung CK. (2004). Urinary tract infection: the urological perspective. Indian journal of pediatrics, 15630321.

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