Urinary Tract Infection: symptoms, diagnosis and treatment

A urinary tract infection is an infection in the bladder, urethra, kidneys or other urinary structures.

Many infections involve the bladder, while an infection that reaches the kidneys can make a person feel much more unwell. Bacteria are a frequent cause. Assessment matters because similar urinary symptoms can also arise from irritation, stones, sexually transmitted infections, or problems emptying the bladder.

Painful urination, frequent urination and a sudden urge to pass urine are very common presentations of urinary tract infection. Cloudy urine and blood in the urine can also occur. Some people have lower abdominal discomfort or feel that the bladder has not emptied fully.

Fever, chills, flank pain, nausea or vomiting may suggest that the infection is affecting the upper urinary tract and need prompt medical assessment. Children, older adults and people with catheters may show less typical changes, such as new bedwetting or a change in usual continence.

Bacteria can enter through the urethra and multiply in the bladder. If urine remains in the bladder for longer than usual, bacteria have more opportunity to grow. A urinary catheter can provide another route for bacteria, and changes around the genital area may contribute to irritation or infection.

Symptoms may begin over a short period and can range from mild bladder discomfort to illness with fever. With appropriate treatment, uncomplicated bladder infections often settle. Repeated episodes deserve review to look for a pattern, such as incomplete emptying, a stone, pregnancy, catheter use or another underlying cause.

Risk can be higher during pregnancy, after menopause, with diabetes, urinary stones, an enlarged prostate, a catheter, or a condition that affects bladder emptying. Sexual activity and dehydration may be relevant for some people. Having a risk factor does not confirm an infection; a clinician considers the complete symptom pattern.

A clinician asks about symptoms, medicines, pregnancy, previous infections and any fever or back pain. A urine sample may be checked for signs of infection and sometimes sent for culture to identify the organism and guide antibiotic selection. Examination or further tests may be needed when symptoms are severe, recurrent, unusual, or linked with poor urine flow.

Treatment depends on the site of infection, how unwell someone is, pregnancy status, health conditions and urine-test findings. Antibiotics may be prescribed when a bacterial infection is suspected or confirmed; take them exactly as directed and do not save leftover medicine. Drinking fluids when safe for you and using suitable pain relief may ease symptoms while treatment takes effect.

Urgent treatment, intravenous fluids or hospital care may be needed for kidney infection, dehydration, severe illness or inability to take medicines by mouth.

Keep a brief record of symptoms, urine changes, recent medicines and possible triggers before an appointment. Seek a review if symptoms return after treatment, rather than reusing an old prescription. People who have repeated infections can discuss an individual prevention plan with a clinician.

An untreated infection can move from the bladder toward the kidneys. In some cases, infection can spread beyond the urinary tract and cause serious illness. Prompt assessment is particularly important during pregnancy and for people with a weakened immune system, a urinary catheter or known urinary tract obstruction.

Regular fluid intake, not delaying urination for long periods, and gentle genital hygiene may help some people. Emptying the bladder after sex can be useful for those who notice infections around sexual activity. Catheter care should follow the instructions from the treating team. Prevention measures should be tailored when infections recur.

Arrange a GP or telemedicine consultation for new urinary symptoms, especially burning, urgency, visible blood, or repeated episodes. Seek urgent care for fever, chills, flank pain, vomiting, confusion, severe weakness, or trouble passing urine. These warning signs need timely assessment because they can occur when infection or obstruction is more serious.