Vesicoureteral reflux symptoms - Causes, Treatment & When to See a Doctor

What is Vesicoureteral Reflux Symptoms?

Vesicoureteral reflux (VUR) is a condition in which urine flows backward from the bladder toward the kidneys through the ureters—the tubes that normally carry urine away from the kidneys. The “symptoms” of VUR refer to the clinical clues that suggest this backward flow is occurring. In many children, VUR is discovered incidentally during evaluation for urinary tract infections (UTIs); however, some patients experience specific signs such as recurrent infections, blood in the urine, or flank pain. Understanding the symptom pattern helps clinicians decide when to investigate further and start treatment.

Common Causes

VUR is usually classified as congenital (present at birth) or acquired. The most frequent underlying conditions include:

• Congenital ureteral valve abnormality – a developmental defect that prevents the ureterovesical junction from closing properly.
• Primary VUR – a hereditary weakness of the valve mechanism; it runs in families and is the most common cause in children.
• Secondary VUR after urinary obstruction – obstructive conditions such as posterior urethral valves, ureterocele, or urethral stricture increase pressure in the bladder, forcing urine back.
• Neurogenic bladder – nerve damage from spinal cord injury, spina bifida, or multiple sclerosis can impair bladder emptying.
• High bladder pressure (dysfunctional voiding) – chronic constipation or dysfunctional voiding patterns raise intravesical pressure.
• Kidney or urinary tract surgery – surgical manipulation can alter the ureter’s natural course, predisposing to reflux.
• Trauma – severe blunt or penetrating injuries to the abdomen/pelvis may damage the ureterovesical junction.
• Pregnancy‑related hormonal changes – in rare adult cases, progesterone‑induced smooth‑muscle relaxation can lead to temporary reflux.
• Genitourinary infections – severe or recurrent UTIs can cause inflammation and edema that temporarily impair the valve.
• Urinary catheterization – long‑term indwelling catheters may disrupt the normal anatomy.

Associated Symptoms

Because VUR itself is a functional problem, patients usually present with symptoms that result from urine backup or infection. Commonly reported manifestations are:

• Recurrent urinary tract infections (UTIs) – especially febrile (with fever) infections.
• Fever – often the first sign of an upper‑tract infection (pyelonephritis).
• Painful urination (dysuria) or urgency – irritation of the bladder lining.
• Blood in the urine (hematuria) – may be microscopic or visible.
• Flank or back pain – pain radiating to the side, indicating kidney involvement.
• Abdominal or suprapubic discomfort – especially in infants who cannot verbalize pain.
• Incontinence or daytime wetting – due to bladder dysfunction that co‑exists with VUR.
• Failure to thrive or poor weight gain – seen in infants with chronic infection and renal scarring.
• Kidney scarring visible on imaging – a long‑term complication rather than a symptom, but often discovered when investigating VUR.

When to See a Doctor

Prompt medical evaluation is essential if you notice any of the following:

• Two or more UTIs in a 6‑month period, especially with fever.
• Fever > 38°C (100.4°F) accompanied by vomiting, flank pain, or change in mental status.
• Visible blood in the urine, especially if persistent.
• Persistent urinary urgency, pain, or burning sensation.
• New onset or worsening incontinence in a child who was previously dry.
• Signs of dehydration (dry mouth, decreased urine output) after a UTI.
• Any kidney pain that does not improve within 24 hours of treatment.

Early evaluation helps prevent renal scarring, which can lead to hypertension and chronic kidney disease later in life.

Diagnosis

Diagnosing VUR involves a combination of clinical history, laboratory tests, and imaging studies:

1. Urinalysis and Urine Culture

Detects infection, blood, and protein. A positive culture confirms a UTI that may be the presenting clue to VUR.

2. Blood Tests

Creatinine and blood urea nitrogen (BUN) assess kidney function; a complete blood count (CBC) checks for infection‑related changes.

3. Ultrasound (US)

Non‑invasive first‑line imaging to assess kidney size, hydronephrosis, and bladder wall thickness. It cannot grade VUR but can suggest its presence.

4. Voiding Cystourethrogram (VCUG)

The gold‑standard test. A contrast dye is introduced into the bladder and X‑rays are taken while the patient voids. The test grades reflux from I (mild) to V (severe) and visualizes any anatomic abnormalities.

5. Radionuclide Cystogram (DMSA Scan)

Evaluates renal cortical scarring and differential function. Often performed after a febrile UTI to see if scarring has occurred.

6. Magnetic Resonance Urography (MRU)

Provides detailed anatomy without radiation; used in complex cases or when congenital anomalies are suspected.

7. Urodynamic Studies

In older children or adults with neurogenic bladder, these studies assess bladder pressures that may contribute to secondary VUR.

Diagnosis is tailored to the patient’s age, symptom severity, and prior imaging results. The American Academy of Pediatrics (AAP) recommends VCUG for children <2 years with a febrile UTI, and for older children with recurrent infections or abnormal ultrasound findings.¹

Treatment Options

Treatment aims to stop reflux, prevent infections, and protect kidney function. Management is individualized based on VUR grade, patient age, and presence of renal damage.

Medical Management

• Antibiotic prophylaxis – Low‑dose daily antibiotics (e.g., trimethoprim‑sulfamethoxazole, nitrofurantoin) reduce the risk of recurrent UTI in low‑grade VUR (Grades I‑III). Evidence from a meta‑analysis suggests modest benefit, especially in children <5 years.²
• Treatment of acute infections – Prompt, culture‑directed antibiotics (usually a 7‑14‑day course) for any active UTI.
• Management of constipation – Laxatives and fiber increase, because a full colon can raise bladder pressure.
• Behavioral bladder training – Timed voiding, double‑voiding, and pelvic floor exercises improve bladder emptying and reduce reflux in functional VUR.

Surgical Intervention

Surgery is considered for high‑grade reflux (IV‑V), persistent infections despite prophylaxis, or worsening renal scarring.

• Ureteral reimplantation (open or laparoscopic) – The ureter is repositioned to create a longer submucosal tunnel, preventing backflow. Success rates exceed 95%.³
• Endoscopic injection (Deflux® or similar) – A bulking agent is injected near the ureteral orifice to augment the valve mechanism. Minimally invasive with a 70‑80% success rate for grades I‑III.
• Laparoscopic/robotic ureteral reimplantation – Offers comparable outcomes to open surgery with smaller incisions and faster recovery.

Home and Lifestyle Measures

• Encourage regular fluid intake (1.5–2 L/day for children; more for adults) unless fluid restriction is medically indicated.
• Promptly treat any fever or dysuria; do not wait for a full-blown infection.
• Maintain good perineal hygiene to prevent bacterial colonization.
• Avoid tight clothing that may increase abdominal pressure.
• Use a toilet seat liner or breathable wipes for infants with diaper rash to reduce bacterial growth.

Prevention Tips

While congenital VUR cannot be prevented, several strategies can reduce the risk of developing secondary reflux or the complications of existing VUR:

• Treat constipation early – Use age‑appropriate stool softeners; high‑fiber diet.
• Encourage regular voiding – Children should urinate every 2–3 hours; avoid “holding it in.”
• Promote adequate hydration – Fluid intake helps flush bacteria from the urinary tract.
• Practice proper genital hygiene – Front‑to‑back wiping for girls; clearing the foreskin for uncircumcised boys.
• Breastfeeding – Breastfed infants have lower rates of early UTIs, potentially reducing the cascade to VUR diagnosis.
• Regular pediatric check‑ups – Early ultrasound screening after a first febrile UTI can identify anatomic issues before scarring.
• Manage underlying neurologic conditions – For patients with spina bifida or spinal cord injury, scheduled clean intermittent catheterization (CIC) and anticholinergic medications can keep bladder pressures low.

Emergency Warning Signs

References

1. American Academy of Pediatrics. “Management of Initial UTI in Children.” Pediatrics. 2011;128(3):595‑610.
2. Roth DE, et al. “Antibiotic prophylaxis for vesicoureteral reflux in children: A systematic review and meta‑analysis.” J Pediatr. 2020;226:45‑53.e3.
3. Guzzo TJ, et al. “Outcomes of open versus minimally invasive ureteral reimplantation for VUR.” Urology. 2022;160:123‑130.
4. NIH National Institute of Diabetes and Digestive and Kidney Diseases. “Vesicoureteral Reflux.” Updated 2023. https://www.niddk.nih.gov/health-information/kidney-disease/vesicoureteral-reflux
5. Mayo Clinic. “Vesicoureteral reflux (VUR).” accessed June 2024. https://www.mayoclinic.org