UTIs Explained: Causes, Symptoms and Treatment Options

What is a urinary tract infection?

A urinary tract infection (UTI) is an infection in any part of the urinary system — the bladder, urethra, ureters or kidneys. Most infections involve the lower tract (the bladder and urethra) and are commonly caused by bacteria, most often Escherichia coli normally found in the bowel.

UTIs are very common, particularly in women, partly because the female urethra is shorter, making it easier for bacteria to reach the bladder.

Common causes and risk factors

Several everyday factors can increase the chance of developing a UTI:

• Sexual activity, which can introduce bacteria near the urethra
• Not drinking enough fluids
• Holding in urine for long periods
• Wiping back to front after using the toilet
• Use of certain contraceptives such as diaphragms
• Menopause and the related hormonal changes
• An enlarged prostate in men, or conditions that block urine flow

Recognising the symptoms

Typical lower-tract symptoms include:

• A burning or stinging feeling when passing urine
• Needing to urinate more often or urgently
• Cloudy, dark or strong-smelling urine
• Pain low down in the tummy
• Feeling generally unwell or tired

If an infection spreads to the kidneys it can become more serious. Warning signs include a high temperature, shivering, pain in the lower back or sides, nausea and confusion. These need prompt medical attention.

How UTIs are treated

Mild bladder infections sometimes settle on their own with rest and plenty of fluids. When treatment is needed, a healthcare professional may recommend a short course of antibiotics. Because UTIs are caused by bacteria rather than viruses, antibiotics can be effective — but they are not a cure for viral illnesses, and using them unnecessarily contributes to resistance.

A few important principles apply to any antibiotic course:

• Always complete the full course your doctor prescribes, even if you feel better quickly
• Never share antibiotics or use leftovers from a previous illness
• Tell your prescriber about any allergies, especially to penicillin or sulfa medicines
• Report side effects and read the patient information leaflet carefully

You can browse our antibiotics range to understand the common options, and read more about how bacteria cause illness in our overview of bacterial infections explained.

Self-care and prevention

Alongside any prescribed treatment, simple steps may help reduce discomfort and lower the risk of recurrence:

• Drink water regularly so urine stays pale
• Urinate when you feel the need rather than holding on
• Wipe front to back
• Empty your bladder after sex
• Avoid heavily perfumed products around the genital area

Pain relief such as paracetamol may ease discomfort while an infection clears. A pharmacist can advise on suitable options.

When to see a doctor

You should seek medical advice if symptoms are severe, do not improve within a couple of days, keep coming back, or if you are pregnant, male, or caring for a child with suspected UTI. Recurrent infections sometimes point to an underlying cause that needs investigation.

Because antibiotic overuse drives resistance, professionals increasingly confirm an infection before prescribing. Learn why this matters in our piece on antibiotic resistance explained.

Key takeaways

UTIs are common and usually treatable. Recognising symptoms early, staying well hydrated and following professional advice on antibiotics all help you recover safely while protecting the wider effectiveness of these medicines.

General information only — not medical advice. Always read the patient information leaflet and consult a doctor or pharmacist before starting any medication.