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The Curious Bag
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The kidney produces urine and the ureter carries urine from the kidney to the bladder. If the junction where these two join at become narrowed, urine flow from the kidney can be obstructed. There are many different reasons urine flow can be obstructed.
Inflammation
The ureter can become inflamed, which will cause the ureter to become compressed, decreasing the flow of urine to the bladder.
Kidney Stones
Kidney stones in the ureter can severely decrease the rate of urine flow through the ureter as it temporarily forms a plug disabling normal urine flow.
Retroperitoneal Fibrosis
Retroperitoneal fibrosis is a condition in which scar tissue forms in the renal cavity. The renal cavity is where urine flows from the kidneys to the ureter. If compressed, it will decrease urine flow.
Scar Tissue
After a surgery has been performed to correct urinary obstruction, scar tissue sometimes forms in the renal cavity or ureter.
Weak Bladder
A weak bladder that cannot push urine out of kidney into the ureter can be caused by certain medications or neurological conditions.
Source:
Children's Specialists of San Diego: Urinary Obstruction
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