UTI and fever: what to know

A urinary tract infection can affect the bladder or travel upwards to the kidneys. Fever, chills, feeling unusually weak, or pain in the side or back are more concerning for infection beyond the bladder. Burning urine, needing to pass urine often, urgency, or cloudy urine can occur with a lower UTI, but fever changes the urgency of the assessment.

Fever can also come from another illness, such as acute bronchitis, a common cold, or COVID-19. The pattern of symptoms helps a clinician decide whether urine testing, examination, or another test is needed.

Arrange medical advice promptly rather than relying on leftover antibiotics. A clinician may ask when the fever began, whether you have pain near the ribs or back, and whether you are passing urine normally. Drink fluids if you can do so comfortably, rest, and use only fever medicine that is suitable for you and taken according to its label or professional advice.

Do not share antibiotics or stop a prescribed course early without checking with the prescriber. Tell the clinician about pregnancy, kidney problems, allergies, and medicines you already take.

Seek urgent medical help for confusion, faintness, severe weakness, trouble breathing, repeated vomiting, severe side or back pain, very little urine, or a rapidly worsening fever. These signs can indicate a serious infection or dehydration. Children, older adults, pregnant people, and people with diabetes or reduced immunity should seek advice promptly when fever accompanies urinary symptoms.

Ask whether your symptoms fit a bladder infection or kidney infection, whether a urine sample is needed before treatment, which warning signs should bring you back, and how to manage fever safely with your other medicines.