Urinary tract infection

Disease Description (Causes and Symptoms)

• Definition: A urinary tract infection (UTI) is a disease in which microorganisms invade the urinary tract, including the kidneys, ureters, bladder, urethra, and prostate, causing inflammation.
• Causes/Pathophysiology: Approximately 85% of cases are caused by Escherichia coli, and in most cases, the main route is an ascending infection that travels from the urethra to the bladder. Risk factors include anatomical or functional abnormalities of the urinary system, urethral catheterization, urinary tract procedures or surgery, sexual intercourse, and difficulty urinating.
• Main symptoms: Lower urinary tract infections (cystitis) commonly cause painful urination, frequent urination, urinary urgency, a feeling of incomplete bladder emptying, and a burning sensation during urination. Upper urinary tract infections (pyelonephritis) are accompanied by high fever and chills, flank pain, nausea and vomiting, and general malaise. Hematuria or urethral discharge (urethritis) may sometimes occur, and there may also be no symptoms.

Treatment Methods

• First-line treatment: Antibiotic therapy is standard. An appropriate antibiotic is selected based on the results of urine testing, culture, and antibiotic susceptibility testing. For uncomplicated cystitis, a short course of oral antibiotics (e.g., 3 to 5 days) is common, but the duration may vary depending on the clinical presentation and guidelines.
• Upper urinary tract infection (pyelonephritis): Depending on the severity, hospitalization and intravenous (IV) antibiotics may be necessary, and oral antibiotics may be prescribed for 7–14 days (or for the duration specified by guidelines). The provided RAG information lists the treatment duration for uncomplicated pyelonephritis as 1 to 2 weeks.
• Procedures/surgery: If urinary tract obstruction (such as urinary stones or strictures) or an abscess (such as a renal abscess) is present, drainage (stent placement, nephrostomy, or percutaneous drainage) or surgical treatment may be necessary.
• Additional tests/treatment: If there is no improvement with antibiotic treatment or infections recur, imaging tests such as ultrasound or CT and evaluation for urinary tract abnormalities or obstruction are necessary.
• Lifestyle management (self-care): Adequate fluid intake, avoiding delayed urination, urinating immediately after sexual intercourse, hygiene management (wiping from front to back), proper urinary catheter care, and removal of unnecessary catheters are recommended.
• Precautions: When antibiotics are prescribed, be sure to confirm the duration, dosage, and any allergies, and do not stop taking the prescribed medication on your own. Treatment strategies differ for pregnant patients and patients with impaired kidney function or weakened immunity, so they should consult a healthcare professional.

Checklist Before an Outpatient Visit (Items to Bring and Sample Questions)

• Items to bring (useful information to provide)
  • A list of medications currently being taken (including prescription drugs, OTC medications, and supplements)
  • A history of medication allergies (especially antibiotics)
  • Recent urinalysis and culture results (if available)
  • A history of previous urinary tract infections and treatment details (antibiotics used and whether infections recurred)
  • When recent symptoms began and how they have progressed (fever, flank pain, changes in urination, etc.)
  • If urine can be collected, a clean-catch midstream urine sample (as instructed by the clinic)
  • Possibility of pregnancy or whether you are pregnant
  • Whether a catheter is being used or a history of recent urinary tract procedures or surgery
• Important information to discuss at the outpatient visit (useful for patients to organize in advance)
  • When the symptoms began and patterns of worsening or improvement
  • Whether there is fever, chills, vomiting, or altered consciousness
  • The severity of pain during urination and whether there is bleeding
  • Recent sexual activity, contraception method, and menstrual cycle (women)
  • Whether there are urination problems (urinary urgency, difficulty urinating, or a feeling of incomplete bladder emptying)

General Sample Questions to Ask the Doctor

• What are the expected side effects of this medication (the prescribed antibiotic)? What should I be careful about while taking it?
• How long will the antibiotic treatment last? Do I need to finish the medication even if my symptoms improve?
• If my symptoms worsen or get worse, what symptoms mean that I should go to the emergency room?
• What lifestyle changes should I make to reduce the risk of recurrence?
• If I am pregnant, how will the treatment plan change?

Sample Condition-Specific Questions

• If I have recurrent urinary tract infections, are imaging tests such as computed tomography (CT) or a renal ultrasound necessary?
• In male patients or patients aged 65 or older, how are the possibilities of prostatitis or urinary tract obstruction evaluated?

(If necessary, showing these questions directly during the appointment may make the visit more efficient.)