A urinary obstruction refers to anything that blocks, slows, or
disrupts the normal flow of urine through the
urinary tract. Obstructions can occur at any point in
the urinary tract. They can be present at birth
(congenital) or develop later.
Causes of urinary obstructions in children include:
Kidney stones. Kidney stones are caused
by the buildup of minerals in the kidneys.
An abnormality of the
point where the
ureter joins the kidney.
A sagging or
bulging of the ureter into the bladder, called a
An abnormality in which the
ureter opens into an area other than the bladder. The ureter may open into the
urethra or the
vagina in girls or the
vas deferens in boys.
narrowed, or widened ureters or urethra.
Urinary obstructions disrupt normal urine flow and allow bacteria to
grow in the urinary tract. This increases the risk of bladder and kidney
Primary Medical Reviewer
William H. Blahd, Jr., MD, FACEP - Emergency Medicine
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