{"id":4916,"date":"2025-11-22T18:26:35","date_gmt":"2025-11-22T23:26:35","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/?post_type=chapter&p=4916"},"modified":"2025-12-07T23:14:02","modified_gmt":"2025-12-08T04:14:02","slug":"urinary-tract-infections-utis-causes-types-and-risk-factors","status":"web-only","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/chapter\/urinary-tract-infections-utis-causes-types-and-risk-factors\/","title":{"raw":"8p9 Urinary Tract Infections (UTIs)\u2013 Causes, Types, and Risk Factors","rendered":"8p9 Urinary Tract Infections (UTIs)\u2013 Causes, Types, and Risk Factors"},"content":{"raw":"Urinary Tract Infections (UTIs) \u2013 Causes, Types, and Risk Factors<\/strong>\r\n

Categories of UTIs based on Location:<\/strong><\/h1>\r\n
    \r\n \t
  • Cystitis:<\/strong>\u00a0Infection of the\u00a0bladder<\/strong>.<\/li>\r\n \t
  • Urethritis:<\/strong>\u00a0Infection of the\u00a0urethra<\/strong>.<\/li>\r\n \t
  • Pyelonephritis:<\/strong>\u00a0Infection of the\u00a0kidneys<\/strong>\u00a0(upper urinary tract).<\/li>\r\n<\/ul>\r\n

    Pathogenesis and Spread:<\/strong><\/h1>\r\n
      \r\n \t
    • Most often caused by\u00a0Escherichia coli (E. coli)<\/strong><\/em>, which normally reside in the large intestine.<\/li>\r\n \t
    • E. coli<\/em>\u00a0ascends<\/strong>\u00a0through the urethra to infect the bladder (cystitis<\/strong>) or up further into the ureters and kidneys (pyelonephritis<\/strong>).<\/li>\r\n<\/ul>\r\n

      Pathways of Infection:<\/strong><\/h1>\r\n
        \r\n \t
      • Infection from bacteria in feces:<\/strong>\r\n
          \r\n \t
        • Females are advised to wipe front to back <\/strong>to prevent bacteria from spreading from the anus to the urethra.<\/li>\r\n \t
        • Females are more susceptible because of shorter urethra<\/strong>, making it easier for bacteria to reach the bladder.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t
        • Prostate hypertrophy in males:<\/strong>\r\n
            \r\n \t
          • Causes urinary retention<\/strong>. Residual urine creates a warm, moist environment conducive to bacterial growth.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

            Predisposing Factors:<\/strong><\/h1>\r\n
              \r\n \t
            • Age: <\/strong>\u00a0Decreased bladder mucus and IgA production with aging reduces the protective layer against bacteria.<\/li>\r\n \t
            • Incontinence:<\/strong>\u00a0 Increases the potential for bacterial entry and colonization.<\/li>\r\n \t
            • Retention:<\/strong>\u00a0 Urine stasis provides a breeding ground for bacteria.<\/li>\r\n \t
            • Diabetes mellitus:<\/strong>\u00a0 Glucosuria (glucose in urine) provides nutrition for bacteria, increasing risk.\u00a0 Vascular impairments can also increase risk of infection.<\/li>\r\n \t
            • Structural abnormalities such as: <\/strong>improper valve function at ureter-bladder junction\r\n
                \r\n \t
              • Allows urine, and bacteria, to flow back into the ureters and kidneys, causing pyelonephritis (vesicoureteral reflux).<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t
              • Recurrent or prolonged catheterization:<\/strong>\u00a0 Introduces bacteria directly into the urinary tract.<\/li>\r\n \t
              • Bloodstream infection:\u00a0 <\/strong>Bacteria can seed kidneys via hematogenous spread.<\/li>\r\n<\/ul>\r\n

                Symptoms & Signs:<\/strong><\/h1>\r\n
                  \r\n \t
                • Bladder\/urethral infection:<\/strong>\u00a0 Burning sensation during urination (dysuria<\/strong>), increased frequency (often caused by hyperactive bladder from irritation), urgency, nocturia<\/strong> (waking up at night to urinate).<\/li>\r\n \t
                • Kidney infection:<\/strong>\u00a0 Fever, flank pain, malaise, nausea, and vomiting.<\/li>\r\n \t
                • Signs of infection:<\/strong>\u00a0 Redness, warmth, swelling in affected areas.\u00a0 Edema in the zone of infection. Fever, feeling tired or generally unwell, nausea.<\/li>\r\n<\/ul>\r\n

                  Lab Tests:<\/strong><\/h1>\r\n
                    \r\n \t
                  • Urinalysis findings:<\/strong>\r\n
                      \r\n \t
                    • White blood cells (WBCs):<\/strong>\u00a0Indicates immune response.<\/li>\r\n \t
                    • Bacteriuria:<\/strong>\u00a0Sign of infection.<\/li>\r\n \t
                    • Pus\/Cloudy urine:<\/strong>\u00a0Related to infection and inflammatory exudate.<\/li>\r\n \t
                    • Hematuria:<\/strong>\u00a0Blood in urine, indicating glomerular or urinary tract damage.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

                      Pathology and Damage:<\/strong><\/h1>\r\n
                        \r\n \t
                      • Infection causes inflammation<\/strong>, increased WBC proliferation and changes in WBC counts (e.g., neutrophilia, leukocytosis ), tissue necrosis, formation of abscesses.<\/li>\r\n \t
                      • Chronic infections<\/strong>\u00a0can lead to scarring and\u00a0loss of kidney function<\/strong>.<\/li>\r\n<\/ul>\r\n

                        Risk Factors:<\/strong><\/h1>\r\n
                          \r\n \t
                        • Incomplete bladder emptying<\/strong>\u00a0due to weak detrusor muscle or flaccid neurogenic bladder or prostatic hypertrophy or urethral strictures\/obstructions.<\/li>\r\n \t
                        • Menopause<\/strong> due to decreased levels of mucus and protective normal flora (e.g., lactobacillus)<\/li>\r\n \t
                        • Impaired blood supply:<\/strong>\r\n
                            \r\n \t
                          • Weak immune response to infection.<\/li>\r\n \t
                          • Lower white blood cell proliferation.<\/li>\r\n \t
                          • Often\u00a0immunosuppressed<\/strong>\u00a0due to\u00a0comorbidities<\/strong>\u00a0like HIV.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t
                          • Other risk factors:<\/strong>\r\n
                              \r\n \t
                            • Immobility:<\/strong>\u00a0Bedridden patients.<\/li>\r\n \t
                            • Use of catheters:<\/strong>\u00a0Most common Iatrogenic cause of UTIs in Canada.<\/li>\r\n \t
                            • Diabetes:<\/strong>\u00a0Promotes bacterial growth via glucosuria.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

                              Treatment & Prevention:<\/strong><\/h1>\r\n
                                \r\n \t
                              • Antibiotics:<\/strong>\u00a0 Target bacteria and clear the infection.<\/li>\r\n \t
                              • Good hygiene:<\/strong>\u00a0 Proper wiping, hydration, and avoiding irritants.<\/li>\r\n \t
                              • Treat structural abnormalities:<\/strong>\u00a0 Surgical correction if needed.<\/li>\r\n \t
                              • Cranberry & Blueberry Juice:<\/strong>\u00a0 Tannins are thought to reduce capability of E. coli<\/em> adhering to bladder mucosa<\/li>\r\n \t
                              • Address underlying conditions that are risk factors:<\/strong><\/li>\r\n<\/ul>\r\nControl diabetes, avoid catheters when possible, and manage prostatic hypertrophy to prevent recurrent infections.\r\n

                                Summary:<\/strong><\/h1>\r\nUTIs, most commonly caused by E. coli<\/em>, often ascend from the urethra to the bladder and potentially the kidneys, especially with risk factors such as short urethra, retention, or structural issues. UTIs present with symptoms of dysuria, urgency, frequency, and systemic signs like fever and malaise. In elderly or immunocompromised individuals, response may be blunted, and risk factors like retention, immobility, and catheter use increase the likelihood of infection. Good hygiene, prompt treatment, and managing predisposing factors are essential for prevention of complications and recurrent UTIs as well as ensuring long-term health.","rendered":"

                                Urinary Tract Infections (UTIs) \u2013 Causes, Types, and Risk Factors<\/strong><\/p>\n

                                Categories of UTIs based on Location:<\/strong><\/h1>\n
                                  \n
                                • Cystitis:<\/strong>\u00a0Infection of the\u00a0bladder<\/strong>.<\/li>\n
                                • Urethritis:<\/strong>\u00a0Infection of the\u00a0urethra<\/strong>.<\/li>\n
                                • Pyelonephritis:<\/strong>\u00a0Infection of the\u00a0kidneys<\/strong>\u00a0(upper urinary tract).<\/li>\n<\/ul>\n

                                  Pathogenesis and Spread:<\/strong><\/h1>\n
                                    \n
                                  • Most often caused by\u00a0Escherichia coli (E. coli)<\/strong><\/em>, which normally reside in the large intestine.<\/li>\n
                                  • E. coli<\/em>\u00a0ascends<\/strong>\u00a0through the urethra to infect the bladder (cystitis<\/strong>) or up further into the ureters and kidneys (pyelonephritis<\/strong>).<\/li>\n<\/ul>\n

                                    Pathways of Infection:<\/strong><\/h1>\n
                                      \n
                                    • Infection from bacteria in feces:<\/strong>\n
                                        \n
                                      • Females are advised to wipe front to back <\/strong>to prevent bacteria from spreading from the anus to the urethra.<\/li>\n
                                      • Females are more susceptible because of shorter urethra<\/strong>, making it easier for bacteria to reach the bladder.<\/li>\n<\/ul>\n<\/li>\n
                                      • Prostate hypertrophy in males:<\/strong>\n
                                          \n
                                        • Causes urinary retention<\/strong>. Residual urine creates a warm, moist environment conducive to bacterial growth.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                          Predisposing Factors:<\/strong><\/h1>\n
                                            \n
                                          • Age: <\/strong>\u00a0Decreased bladder mucus and IgA production with aging reduces the protective layer against bacteria.<\/li>\n
                                          • Incontinence:<\/strong>\u00a0 Increases the potential for bacterial entry and colonization.<\/li>\n
                                          • Retention:<\/strong>\u00a0 Urine stasis provides a breeding ground for bacteria.<\/li>\n
                                          • Diabetes mellitus:<\/strong>\u00a0 Glucosuria (glucose in urine) provides nutrition for bacteria, increasing risk.\u00a0 Vascular impairments can also increase risk of infection.<\/li>\n
                                          • Structural abnormalities such as: <\/strong>improper valve function at ureter-bladder junction\n
                                              \n
                                            • Allows urine, and bacteria, to flow back into the ureters and kidneys, causing pyelonephritis (vesicoureteral reflux).<\/li>\n<\/ul>\n<\/li>\n
                                            • Recurrent or prolonged catheterization:<\/strong>\u00a0 Introduces bacteria directly into the urinary tract.<\/li>\n
                                            • Bloodstream infection:\u00a0 <\/strong>Bacteria can seed kidneys via hematogenous spread.<\/li>\n<\/ul>\n

                                              Symptoms & Signs:<\/strong><\/h1>\n
                                                \n
                                              • Bladder\/urethral infection:<\/strong>\u00a0 Burning sensation during urination (dysuria<\/strong>), increased frequency (often caused by hyperactive bladder from irritation), urgency, nocturia<\/strong> (waking up at night to urinate).<\/li>\n
                                              • Kidney infection:<\/strong>\u00a0 Fever, flank pain, malaise, nausea, and vomiting.<\/li>\n
                                              • Signs of infection:<\/strong>\u00a0 Redness, warmth, swelling in affected areas.\u00a0 Edema in the zone of infection. Fever, feeling tired or generally unwell, nausea.<\/li>\n<\/ul>\n

                                                Lab Tests:<\/strong><\/h1>\n
                                                  \n
                                                • Urinalysis findings:<\/strong>\n
                                                    \n
                                                  • White blood cells (WBCs):<\/strong>\u00a0Indicates immune response.<\/li>\n
                                                  • Bacteriuria:<\/strong>\u00a0Sign of infection.<\/li>\n
                                                  • Pus\/Cloudy urine:<\/strong>\u00a0Related to infection and inflammatory exudate.<\/li>\n
                                                  • Hematuria:<\/strong>\u00a0Blood in urine, indicating glomerular or urinary tract damage.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                    Pathology and Damage:<\/strong><\/h1>\n
                                                      \n
                                                    • Infection causes inflammation<\/strong>, increased WBC proliferation and changes in WBC counts (e.g., neutrophilia, leukocytosis ), tissue necrosis, formation of abscesses.<\/li>\n
                                                    • Chronic infections<\/strong>\u00a0can lead to scarring and\u00a0loss of kidney function<\/strong>.<\/li>\n<\/ul>\n

                                                      Risk Factors:<\/strong><\/h1>\n
                                                        \n
                                                      • Incomplete bladder emptying<\/strong>\u00a0due to weak detrusor muscle or flaccid neurogenic bladder or prostatic hypertrophy or urethral strictures\/obstructions.<\/li>\n
                                                      • Menopause<\/strong> due to decreased levels of mucus and protective normal flora (e.g., lactobacillus)<\/li>\n
                                                      • Impaired blood supply:<\/strong>\n
                                                          \n
                                                        • Weak immune response to infection.<\/li>\n
                                                        • Lower white blood cell proliferation.<\/li>\n
                                                        • Often\u00a0immunosuppressed<\/strong>\u00a0due to\u00a0comorbidities<\/strong>\u00a0like HIV.<\/li>\n<\/ul>\n<\/li>\n
                                                        • Other risk factors:<\/strong>\n
                                                            \n
                                                          • Immobility:<\/strong>\u00a0Bedridden patients.<\/li>\n
                                                          • Use of catheters:<\/strong>\u00a0Most common Iatrogenic cause of UTIs in Canada.<\/li>\n
                                                          • Diabetes:<\/strong>\u00a0Promotes bacterial growth via glucosuria.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                            Treatment & Prevention:<\/strong><\/h1>\n
                                                              \n
                                                            • Antibiotics:<\/strong>\u00a0 Target bacteria and clear the infection.<\/li>\n
                                                            • Good hygiene:<\/strong>\u00a0 Proper wiping, hydration, and avoiding irritants.<\/li>\n
                                                            • Treat structural abnormalities:<\/strong>\u00a0 Surgical correction if needed.<\/li>\n
                                                            • Cranberry & Blueberry Juice:<\/strong>\u00a0 Tannins are thought to reduce capability of E. coli<\/em> adhering to bladder mucosa<\/li>\n
                                                            • Address underlying conditions that are risk factors:<\/strong><\/li>\n<\/ul>\n

                                                              Control diabetes, avoid catheters when possible, and manage prostatic hypertrophy to prevent recurrent infections.<\/p>\n

                                                              Summary:<\/strong><\/h1>\n

                                                              UTIs, most commonly caused by E. coli<\/em>, often ascend from the urethra to the bladder and potentially the kidneys, especially with risk factors such as short urethra, retention, or structural issues. UTIs present with symptoms of dysuria, urgency, frequency, and systemic signs like fever and malaise. In elderly or immunocompromised individuals, response may be blunted, and risk factors like retention, immobility, and catheter use increase the likelihood of infection. Good hygiene, prompt treatment, and managing predisposing factors are essential for prevention of complications and recurrent UTIs as well as ensuring long-term health.<\/p>\n","protected":false},"author":1370,"menu_order":12,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["zoe-soon"],"pb_section_license":"cc-by-nc-sa"},"chapter-type":[],"contributor":[60],"license":[57],"class_list":["post-4916","chapter","type-chapter","status-web-only","hentry","contributor-zoe-soon","license-cc-by-nc-sa"],"part":59,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4916","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/users\/1370"}],"version-history":[{"count":7,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4916\/revisions"}],"predecessor-version":[{"id":5270,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4916\/revisions\/5270"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/parts\/59"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4916\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/media?parent=4916"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapter-type?post=4916"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/contributor?post=4916"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/license?post=4916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}