Urinary Tract Infections

A urinary tract infection is a bacterial infection of any part of the urinary system — the urethra, bladder, ureters or kidneys — and it becomes a matter for an infectious disease specialist when it keeps returning, stops responding to the usual antibiotics, or reaches the kidneys.

A single uncomplicated bladder infection is common and usually straightforward. This page is about the other kind: the infection that comes back for the fourth time this year, or the culture that reports an organism resistant to nearly everything on the list.

Symptoms of urinary tract infections

• Burning or pain when passing urine
• Needing to pass urine frequently, or urgently, often with little result
• Cloudy, strong-smelling, or blood-stained urine
• Pain low in the abdomen or pelvis
• Fever with pain in the flank or back — suggesting the kidneys are involved
• In older adults, new confusion or unsteadiness may be the only sign

When should you see a specialist for a urinary tract infection?

• Three or more infections in a year, or two within six months
• Infection returning within weeks of finishing a course of antibiotics
• A urine culture reporting a multidrug-resistant organism, such as an ESBL-producing or carbapenem-resistant bacterium
• Fever with flank pain, nausea or vomiting — this needs prompt assessment
• Infection associated with a urinary catheter, a stone, or a urinary tract abnormality
• Urinary infection in a man, in pregnancy, or after a kidney transplant

Frequently asked questions about urinary tract infections

Why do my urinary infections keep coming back?

Recurrence has several possible explanations — an organism never fully cleared, a resistant bacterium, a stone or structural issue holding infection, or factors affecting the bladder’s normal defences. Distinguishing between them is the point of a specialist assessment.

Do I need a urine culture every time?

Not for every simple episode, but culture becomes important once infections recur or fail to respond, because it identifies the organism and shows which antibiotics remain effective. Treating repeatedly without culture is how resistance goes unnoticed.

What does a “resistant” result actually mean?

It means the bacterium is no longer affected by one or more antibiotics that would normally work. It does not mean the infection is untreatable — it means the choice of treatment has to be guided by laboratory results rather than by the usual first options.

Can a urinary infection damage my kidneys?

An infection that reaches the kidneys is more serious than a bladder infection and needs prompt treatment. Repeated or untreated kidney infections carry a risk of lasting damage, which is why fever with back pain should not be managed at home.

Do cranberry products help?

Evidence is mixed and they are not a treatment for an active infection. They may be discussed as part of a prevention plan for some people, but they do not replace identifying why infections keep returning.

Conditions related to urinary tract infections

Where recurrent fever is the main complaint and no source is apparent, see Fever of Unknown Origin. Urinary infection after a kidney transplant is managed differently — see Transplant Related Infections. Some infections affecting the genital tract are sexually transmitted rather than urinary; see Sexually Transmitted Infections.

Our infectious disease specialist follows a comprehensive diagnostic approach using detailed history, clinical examination, and advanced investigations to identify the root cause and provide effective treatment.