"UTI" frequently refers specifically to<unk> , but may also be used as a general term for all urinary infections; use location-specific diagnosis.
Renal/perirenal
Pyelonephritis
Emphysematous pyelonephritis
Renal abscess
Perinephric abscess
Ureteral
Infected urolithiasis
Bladder<unk>  ("UTI")
Chronic cystitis
Urethra/periurethra
Urethritis
Prostatitis
Pyelonephritis
Emphysematous pyelonephritis
Renal abscess
Perinephric abscess
Emphysematous pyelonephritis
Infected urolithiasis<unk>  ("UTI")
Chronic cystitis
Urethritis
Prostatitis
Relapse
Recurrence of symptoms within month despite treatment
Caused by same organism and represents treatment failure
Reinfection
Development of symptoms 1-6mo after treatment
Usually due to a different organism
If patient has >3 recurrences in 1 yr consider tumor, calculi, diabetes
For menopausal or postmenopausal women with recurrent infection consider empiric treatment for genitourinary syndrome of menopause (GSM)
Recurrence of symptoms within month despite treatment
Caused by same organism and represents treatment failure
Caused by same organism and represents treatment failure
Development of symptoms 1-6mo after treatment
Usually due to a different organism
If patient has >3 recurrences in 1 yr consider tumor, calculi, diabetes
For menopausal or postmenopausal women with recurrent infection consider empiric treatment for genitourinary syndrome of menopause (GSM)
Anatomic abnormality of urinary tract or external drainage system
Indwelling urinary catheter, stent
Nephrolithiasis, neurogenic bladder, polycystic renal disease, recent instrumentation
Recurrent<unk> 
Advanced age in men (BPH, recent instrumentation, recent prostatic biopsy)
Nursing home residency
Neonatal
Comorbidities (DM, sickle cell disease)
Pregnancy
Immunosuppression (AIDS, immunosuppressive drugs)
Advanced neurologic disease (CVA with disability, Spinal Cord Injuries)
Indwelling urinary catheter, stent
Nephrolithiasis, neurogenic bladder, polycystic renal disease, recent instrumentation
Most common pathogen is E. coli
Anaerobic organisms are rarely pathogenic (do not grow well in urine)
Complicated<unk>  is more likely to be caused by pseudomonas or enterococcus
Acute cystitis
Pyelonephritis
Interstitial cystitis
Infected kidney stone
Pelvic origin
Pelvic inflammatory disease
Prostatitis
Ectopic