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What Causes Urinary Tract Infections?

Jan 08, 2022 Source: Cainiu Health
Dr. Ding Feng
Introduction
1. Congenital factors may impair the urinary tract’s natural defense mechanisms against bacteria, thereby increasing the risk of urinary tract infection (UTI). 2. A weakened immune system significantly reduces the body’s ability to resist infection, allowing pathogens to invade and cause UTI. 3. Iatrogenic factors—such as urethral dilation—may also contribute to UTI development.

Urinary tract infection (UTI) is a common condition among urological diseases. Symptoms typically include urinary frequency, dysuria (painful urination), and urinary urgency. If left untreated, UTIs can lead to additional systemic inflammation and pose serious threats to overall health. The consequences of UTIs are significant—they can interfere with daily work and life, and in severe cases, may even impair future fertility. Therefore, prompt and active treatment is essential upon diagnosis of a UTI. So, what causes urinary tract infections? Below, we address this question.

What Causes Urinary Tract Infections?

1. Congenital Factors

Congenital abnormalities such as urinary or genital stones or urethral strictures can easily cause urinary stasis. This impairs the urinary tract’s natural defense mechanisms against bacterial invasion, thereby increasing susceptibility to UTIs.

2. Weakened Immune Resistance

Chronic conditions—including diabetes mellitus, other chronic illnesses, or malignancies—as well as prolonged use of immunosuppressive agents, can severely compromise the body’s immune defenses. This weakened immunity creates opportunities for pathogenic bacteria to invade and cause UTIs.

3. Iatrogenic Factors

Certain medical procedures may predispose individuals to UTIs—for example, long-term indwelling urinary catheterization, urethral dilation, or frequent transrectal prostate biopsies. These interventions may cause mucosal trauma, allowing pathogenic bacteria to enter the urinary tract and trigger infection.

4. Urinary Tract Anomalies

Individuals with congenital urinary tract malformations or abnormal voiding function—such as renal hypoplasia or vesicoureteral reflux—are at markedly increased risk for developing UTIs.

The above outlines the primary causes of urinary tract infections. We hope this information is helpful to you.

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