Why does urinary tract infection cause blood in urine?

Bacteria can inflame the lining of the bladder, urethra, or other parts of the urinary tract. Inflamed tissue is more fragile, and small amounts of blood may enter the urine. It can appear pink, red, brownish, or be detected only by testing. Blood in Urine is a very common presentation of Urinary Tract Infection. However, urinary infection is only one possible cause; stones, injury, kidney disease, medicines, and other conditions can also cause bleeding.

Tell a clinician about visible blood in urine, even when burning or urgency suggests an infection and even if the colour returns to normal. A urine sample can check for blood and signs of infection, while your history guides whether further tests are needed. Follow the treatment plan if medicine is prescribed. Keep track of clots, pain location, fever, and whether the bleeding recurs.

Seek urgent medical care if you cannot urinate, pass clots, have severe abdominal, back, or side pain, or feel faint. Fever, shaking chills, vomiting, or confusion with urinary symptoms also require urgent assessment. These signs may indicate obstruction, a more severe infection, or another problem that needs prompt treatment.

Ask whether the urine test supports infection, whether a culture is needed, and when you should expect symptoms to improve. Ask what follow-up is appropriate if blood remains visible after treatment, or if it returns after seeming to settle.