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UrologicalICD-10: N39.0Approximately 8-10 million doctor visits per year in the US; affects about 50-60% of women in their lifetime

Urinary Tract Infection

Also known as: UTI, Bladder infection, Cystitis

A urinary tract infection is an infection in any part of the urinary system, including the kidneys, ureters, bladder, and urethra, with most infections affecting the lower tract (bladder and urethra). UTIs are extremely common, especially in women, and are usually caused by bacteria entering the urinary tract. Prompt treatment with antibiotics is effective, and preventive strategies can reduce recurrence.

Symptoms

Strong, persistent urge to urinate
Burning sensation during urination
Passing frequent, small amounts of urine
Cloudy or strong-smelling urine
Blood in the urine (hematuria)
Pelvic pain in women
Fever and chills if the infection has reached the kidneys
Back or flank pain with kidney involvement

Causes

  • Bacterial infection, most commonly by Escherichia coli
  • Bacteria entering the urethra and traveling to the bladder
  • Sexual intercourse increasing bacteria exposure
  • Catheter use introducing bacteria into the urinary tract

Risk Factors

  • Female anatomy with a shorter urethra
  • Sexual activity
  • Menopause due to decreased estrogen
  • Urinary catheter use
  • Urinary tract abnormalities or blockages
  • Suppressed immune system

Diagnosis

  • Urinalysis to detect white blood cells, red blood cells, and bacteria
  • Urine culture to identify the causative bacteria and antibiotic sensitivity
  • Imaging studies for recurrent UTIs or suspected structural abnormalities
  • Cystoscopy for recurrent infections

Treatment

  • Antibiotics such as trimethoprim-sulfamethoxazole, nitrofurantoin, or fosfomycin
  • Increased fluid intake to help flush bacteria
  • Pain relievers for urinary discomfort
  • Intravenous antibiotics for severe kidney infections
  • Low-dose prophylactic antibiotics for recurrent UTIs

Prevention

  • Drinking plenty of water throughout the day
  • Urinating after sexual intercourse
  • Wiping front to back after using the toilet
  • Avoiding irritating feminine products
  • Cranberry products may help prevent some UTIs

When to See a Doctor

  • Painful urination with urgency and frequency
  • Blood in the urine
  • Fever, chills, or back pain suggesting kidney infection
  • UTI symptoms that persist or return despite treatment

Frequently Asked Questions

Related Conditions

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