Learn About what Causes VUR

What causes VUR?

A child can be born with VUR, or it can develop over time

There are two forms of vesicoureteral reflux (VUR), primary and secondary.

Primary VUR

When a child has primary VUR, it means that one or both of the child’s ureters, the tubes that carry urine from the kidneys to the bladder, didn’t develop properly. The ureter is too short, so the valve between the bladder and ureter that normally closes to prevent urine from flowing backward doesn’t shut the way it should.

Primary VUR is the most common kind of VUR and tends to run in families. A child may outgrow it when the ureters lengthen and straighten during the growth process.

Secondary VUR

Secondary VUR is often the result of a urinary blockage of some kind. Sometimes this happens after your child has had numerous urinary tract infections (UTIs), which can cause the ureter to swell and prevent the normal elimination of urine. This is why it’s important to alert your doctor immediately if you suspect your child has a UTI.