Symptoms of urinary tract infection include chills, high fever, pain in the kidney area, frequent urination, urinary urgency and painful urination. Urinary tract infections can be categorized as either upper or lower urinary tract infections depending on where the infection occurs. Upper urinary tract infections are commonly associated with pyelonephritis and lower urinary tract infections are commonly associated with cystitis. When upper urinary tract infection, which is also known as acute pyelonephritis, occurs, patients usually have symptoms such as chills, high fever, pain in the kidney area, frequent urination, urinary urgency, painful urination, and leukocyte tubular pattern in the urine. And when lower urinary tract infection, which is also known as acute cystitis, patients usually do not have obvious chills, high fever and pain in the renal region, and mainly show symptoms such as frequent urination, urgency, and painful urination, and there is no leukocyte tubular pattern in the urine. Patients with symptoms of urinary tract infection should promptly go to the hospital for examination and treatment under the guidance of the doctor.