Symptoms and diagnosis
- Lower UTI/cystitis: burning when passing urine, new frequency or urgency, suprapubic discomfort, cloudy urine or visible blood. Smell or cloudiness alone does not prove infection.
- Upper UTI/pyelonephritis: fever, chills, pain in the side/back below the ribs, nausea or vomiting, sometimes with bladder symptoms.
- A clinician considers pregnancy, sex, age, kidney function, diabetes/immunosuppression, catheter, stones/obstruction, prior cultures, recent antibiotics and local resistance. Vaginal discharge/irritation, urethritis or STI symptoms may point to another diagnosis.
- Urinalysis can support the diagnosis; urine culture identifies the organism and susceptibility. Culture is particularly important in pregnancy, men, children, recurrent/complicated infection, pyelonephritis, treatment failure and resistant-infection risk.
- Repeated infections or suspected obstruction may require ultrasound/other imaging and urology review. Cystoscopy is not routinely needed for every simple UTI.