Urinary tract infection is also known as “urinary tract infection”, often referred to as “urinary tract infection” or “urinary tract infection”. It is caused by the direct invasion of pathogens into the urinary tract, growth and reproduction in the urine, invasion of the mucosa or tissue of the urinary tract and cause damage. Clinically, it is characterized by frequent urination, urgency, painful urination (or crying when urinating), and the presence of white blood cells and/or bacteria in urine tests. However, it is particularly important to note that in infants and young children many cases are characterized by frequent fever as the main symptom and often no symptoms such as frequent and painful urination (crying when urinating), and thus are often misdiagnosed or missed. Urinary tract infections are a relatively common pediatric condition and are among the most common diseases of the urinary tract in children.