Recurrent UTI in Children: A Kidney Problem?

Dr. Tanmay Motiwala
Pediatric Surgeon, Raipur · Updated 30 Sep 2026 · 6 min read

One urine infection (UTI) in a child is worrying enough. But recurrent UTI in children is even more stressful. It comes back every few months, with the same fever, the same crying and the same antibiotics. So most parents start to ask a question their child doctor may not have answered yet: “Is there something wrong with my child’s kidneys or bladder?”

Often, the answer is yes. But the good news is that it is treatable. Let me explain what to look for and what to do.

First — what is a UTI in a child?

A UTI (urinary tract infection) is an infection of the urine system. It starts when germs get in. Most often, the germ is E. coli from the gut. The infection can be in the bladder (lower UTI). Or it can reach the kidneys (upper UTI, also called pyelonephritis).

However, the signs change with age:

In babies and toddlers:

High fever with no clear cause
Crying a lot, poor feeding
Bad-smelling urine
Vomiting

In older children:

Burning or pain when passing urine
Needing to pass urine often and in a hurry
Bedwetting after being dry
Pain in the lower tummy or back

A boy of any age with even one UTI always needs more tests. So does a girl under 2 with a UTI and fever. These are warning signs. They tell us there may be a problem in how the urine system formed.

Why does recurrent UTI in children happen?

Doctors usually call it recurrent UTI when a child has 2 or more infections within 6 months. It often means there is a hidden problem in the urine system. These are the most common causes:

1. Backflow of urine (Vesicoureteral Reflux, VUR)

This is the most common cause. Normally, urine flows one way. It goes from the kidneys, down two thin tubes (ureters), into the bladder and out. In VUR, urine flows backward from the bladder up toward the kidneys when the child passes urine. So germs travel upward and cause repeated kidney infections. Over time, these infections can scar the kidneys for life.

VUR affects about 1 in 100 children. But doctors find it in 30–40% of children tested after a UTI with fever.

2. A blocked kidney outlet (PUJ obstruction)

This is a blockage where the ureter joins the kidney. Urine collects and stays still, so germs grow easily. A scan during pregnancy often picks it up. But sometimes doctors miss it.

3. Extra flaps in the urine pipe (posterior urethral valves, in boys)

These are extra flaps of tissue in the urine pipe (urethra). As a result, they partly block the flow of urine. So they can cause repeated UTIs. In severe cases, they can also damage the kidneys from birth.

4. A bladder that does not work well

Some children hold urine for too long, have constipation, or have an overactive bladder. These children are also at higher risk.

What tests does recurrent UTI in children need?

After the doctor confirms a UTI, they should arrange these tests:

Urine culture — a lab test that proves the infection and finds the germ
Ultrasound of the kidneys and bladder — the first scan; it checks the shape of the kidneys and bladder
MCUG — a special X-ray of the bladder that shows VUR (advised after a UTI with fever in children under 2, or after repeated UTIs)
DMSA scan — a nuclear scan that checks for kidney scars

Many families in Chhattisgarh stop at the ultrasound. But this is often not enough. An ultrasound can look normal even when the child has VUR.

When does recurrent UTI in children need surgery?

Not always — but often.

Doctors treat VUR based on its grade (I–V). Low-grade VUR often goes away on its own. But high-grade VUR (grades IV–V) usually needs a procedure. So does VUR that stays even with preventive antibiotics (prophylaxis). The options are:

Injection through a camera (endoscopic STING/HIT procedure) — a small day-care procedure. The surgeon injects a gel-like filler at the opening of the ureter
Re-joining the ureter (ureteric reimplantation) — an operation that fixes the ureter to the bladder again at the right angle

A PUJ block that causes symptoms or kidney damage needs an operation. The surgeon does a keyhole or robotic repair (pyeloplasty). Also, it works very well.

For these valves in boys, the surgeon removes them with a thin camera (endoscopic valve ablation). The camera goes in through the urine pipe, so there are no cuts.

Recurrent UTI in children and kidney scars

So acting early matters. Each kidney infection can leave a small scar on the kidney. Many scars over time can lead to:

High blood pressure (hypertension) in childhood or adult life
Weaker kidney function
Rarely, kidney failure in severe cases

But you can prevent scarring if doctors find and treat the cause early.

What should you do?

So, if your child has had more than one UTI with fever, or any UTI in a boy, do this:

Ask your child doctor to refer you to a pediatric urologist (a children’s urine surgeon)
Also, do not stop at an ultrasound. Ask about MCUG
Keep a record of every UTI, the germ found, and the treatment

Early tests + the right treatment = healthy kidneys for life.

Dr. Tanmay Motiwala is a Pediatric Surgeon and Urologist at Raipur, trained at AIIMS Jodhpur. He evaluates and treats recurrent UTI in children, VUR, and kidney abnormalities across Raipur, Jagdalpur, and Rajim. Book an appointment: +91 8319084711 or visit drmotiwalapediatricsurgeonraipur.com

📋 This article is part of Dr. Motiwala’s Pediatric Urology in Raipur services — see the full range of conditions treated, what to expect, and when to see a pediatric surgeon.

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My Child Keeps Getting Urine Infections — Is There a Hidden Kidney Problem?