UPJ (Ureteropelvic Junction) obstruction is a blockage that occurs at the point where the urine collecting portion of the kidney meets the ureter, which is the drainage tube down to the bladder. This blockage can prevent urine from flowing freely from the kidney into the bladder, leading to a backup of urine in the kidney. UPJ obstruction can be caused by a variety of factors, including congenital abnormalities, scar tissue, and stones. Symptoms of UPJ obstruction may include pain in the side, nausea, vomiting, and decreased urine output. Treatment options for UPJ obstruction may include observation, endoscopic procedures, or surgery to remove the blockage and restore normal urine flow.
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