Why does kidney infection cause fever?

A kidney infection often begins when bacteria travel upward from the bladder into one or both kidneys. Immune cells release signals that can reset the body's temperature control, producing chills, sweating, and a raised temperature. Fever is a very common presentation of Kidney Infection, but fever has many possible causes.

The illness may also bring pain in the side or back, nausea, tiredness, burning when passing urine, or urine that looks or smells different. Symptoms can develop together or at different times.

Arrange a same-day medical assessment if you have fever with urinary symptoms or pain near the kidney area. A clinician may ask about your symptoms, examine you, and test a urine sample. Treatment commonly includes an antibiotic when a bacterial infection is suspected; take it exactly as prescribed and complete the course unless the prescriber changes the plan.

Drink fluids if you can keep them down, rest, and use a fever medicine only if it is suitable for you. Tell the clinician about pregnancy, kidney disease, allergies, or medicines you already take.

Seek urgent medical care now for confusion, fainting, severe weakness, trouble breathing, repeated vomiting, severe pain, or inability to pass urine. Get prompt help if fever occurs during pregnancy, in a young child, or in someone with a weakened immune system. These features need assessment because infection can become more serious or dehydration can develop.

Ask whether a urine test is needed, whether your symptoms suggest infection elsewhere in the urinary tract, and when you should expect improvement after treatment begins. Ask which warning signs mean you should return sooner.