Pediatric vesicoureteral reflux (VUR) is a condition in which urine flows backward from the bladder into one or both ureters and sometimes up to the kidneys. Normally, urine travels in a one-way direction from the kidneys to the bladder, aided by a valve-like mechanism at the junction of the ureter and bladder. In children with VUR, this mechanism is impaired, allowing urine to reflux. VUR is most commonly diagnosed in infancy and early childhood and is often discovered after a child experiences a urinary tract infection (UTI).

VUR is typically classified into five grades, ranging from mild (Grade I) to severe (Grade V), based on how far urine refluxes and whether it causes dilation of the ureters or kidneys. Lower grades may resolve on their own as the child grows and the urinary tract matures, while higher grades carry a greater risk of kidney damage. The primary concern with VUR is recurrent UTIs, which can lead to renal scarring, reduced kidney function, and, in rare cases, long-term complications such as hypertension or chronic kidney disease.

Symptoms of VUR itself are often absent, especially in infants. Instead, signs may include fever, irritability, poor feeding, abdominal pain, or foul-smelling urine related to UTIs. Diagnosis is usually made through imaging studies, most commonly a voiding cystourethrogram (VCUG), which visualizes urine flow during bladder filling and emptying. Renal ultrasound and nuclear scans may also be used to assess kidney structure and function.

Management of pediatric VUR depends on the child’s age, reflux grade, history of infections, and kidney health. Treatment options range from observation and preventive antibiotics to surgical or endoscopic correction in more severe or persistent cases. With appropriate monitoring and management, most children with VUR achieve good outcomes and maintain normal kidney function into adulthood.