Conditions & Treatments

UPJ Obstruction

Need help now?


UPJ (Ureteropelvic Junction) obstruction is a medical condition that occurs when there is a blockage or narrowing at the point where the ureter (the tube that carries urine from the kidney to the bladder) connects to the renal pelvis (the part of the kidney where urine collects before entering the ureter). This obstruction can lead to a buildup of urine in the kidney, potentially causing a range of symptoms and complications. UPJ obstruction can occur for various reasons and may manifest differently depending on its severity.

At the University of Kansas Department of Urology, our experienced interdisciplinary team is dedicated to enhancing patient care. We utilize the latest advanced treatments and research findings to improve outcomes while minimizing side effects. Our personalized care plans are tailored to your specific needs, informed by the latest in medical advancements.

Types of UPJ Obstruction

  • Congenital UPJ Obstruction: This is the most common type and is present at birth. It often occurs due to an anatomical abnormality where the junction between the ureter and the renal pelvis is narrow or blocked.
  • Acquired UPJ Obstruction: This type of obstruction can develop later in life and is often the result of conditions such as kidney stones, scarring, or tumors that can block or compress the ureter at the junction with the renal pelvis.



The symptoms of UPJ obstruction can vary in severity and may include:

  • Flank pain: Pain in the side or back, often on one side, is a common symptom. The pain can range from mild to severe.
  • Abdominal pain: Some individuals may experience abdominal discomfort or pain, particularly in the lower abdomen.
  • Nausea and vomiting: The buildup of urine in the kidney can lead to nausea and vomiting.
  • Urinary tract infections (UTIs): Frequent UTIs may occur due to the stagnant urine, which can become a breeding ground for bacteria.
  • Hematuria: Blood in the urine can be present, giving it a pink, red, or brownish color.
  • Decreased urine output: In severe cases, there may be a decrease in urine production.
  • Hypertension (high blood pressure): Chronic or long-standing UPJ obstruction can lead to elevated blood pressure.


The causes of UPJ obstruction can vary depending on the type:

  • Congenital UPJ Obstruction: This is typically caused by a developmental abnormality where the junction between the ureter and renal pelvis does not form properly, resulting in a narrowing or blockage.
  • Acquired UPJ Obstruction: This can be caused by several factors, including:
    • Kidney stones: Stones that become lodged at the UPJ can cause a blockage.
    • Scarring: Inflammation, infection, or previous surgeries in the area can lead to scar tissue formation that narrows the UPJ.
    • Tumors: Tumors in the kidney or nearby structures can compress the UPJ and obstruct urine flow.


  • Physical Examination: A doctor may perform a physical examination to check for tenderness or swelling in the abdominal or flank area.
  • Medical History: Discussing your symptoms and medical history with your healthcare provider can help in the diagnostic process.
  • Imaging Studies: Various imaging tests are commonly used to diagnose UPJ obstruction, including:
    • Ultrasound: This non-invasive imaging technique can provide initial clues about the condition.
    • CT Scan: A computed tomography scan can offer more detailed images of the urinary tract and help determine the severity of the obstruction.
    • Magnetic Resonance Imaging (MRI): An MRI can provide additional information about the anatomy and any obstructions.
  • Urodynamic Studies: These tests evaluate the function of the urinary system and can help determine the extent of the obstruction.
  • Urinalysis: A urinalysis may be performed to check for blood or signs of infection in the urine.


The choice of treatment for UPJ obstruction depends on the severity of the condition and its underlying cause:

  • Observation: In cases of mild or asymptomatic UPJ obstruction, especially in infants, doctors may choose to monitor the condition regularly to see if it resolves on its own.
  • Medications: Antibiotics may be prescribed to treat urinary tract infections associated with UPJ obstruction.
  • Minimally Invasive Procedures: If needed, minimally invasive procedures can be performed to relieve the obstruction. These procedures include:
    • Percutaneous Nephrolithotomy: Used for stone removal.
    • Balloon Dilation: A small balloon can be inserted and inflated at the UPJ to widen the narrowed area.
    • Stent Placement: A stent (a tube) can be inserted to keep the ureter open and allow urine to flow more freely.
  • Surgery: In some cases, open surgical intervention may be necessary to repair or reconstruct the ureteropelvic junction. This is more commonly required for severe or complex obstructions.


The prognosis for UPJ obstruction depends on several factors, including the severity of the condition, its underlying cause, and the timeliness of treatment:

  • Mild Cases: Some cases of UPJ obstruction, particularly in infants, may resolve on their own without the need for intervention. Regular monitoring and follow-up with a healthcare provider are essential in such cases.
  • Treatment Success: Minimally invasive procedures and surgical interventions are often successful in relieving UPJ obstruction. The prognosis is generally favorable when appropriate treatment is provided.
  • Complications: If left untreated, UPJ obstruction can lead to recurrent urinary tract infections, kidney damage, and hypertension. Timely diagnosis and intervention can help prevent these complications.
  • Quality of Life: With successful treatment, individuals with UPJ obstruction can lead normal, healthy lives and maintain kidney function.

It’s crucial to work closely with a healthcare provider to determine the most suitable treatment approach and to ensure regular follow-up care to monitor the condition and its long-term effects on kidney health.

Prevention & Management

Preventing UPJ obstruction is challenging since many cases are congenital or caused by factors beyond one’s control. However, there are some measures that can help manage the condition and reduce the risk of complications:

  • Regular Medical Checkups: Routine healthcare visits can help monitor kidney health and detect any potential issues early.
  • Hydration: Staying well-hydrated can help reduce the risk of kidney stones, a common cause of acquired UPJ obstruction.
  • Healthy Diet: Eating a balanced diet low in sodium and rich in fruits and vegetables can contribute to overall kidney health.
  • Medication Compliance: If you have a known UPJ obstruction and are prescribed medications such as antibiotics or medications to manage blood pressure, it’s essential to take them as directed by your healthcare provider.
  • Lifestyle Modifications: Lifestyle changes such as maintaining a healthy weight, avoiding smoking, and limiting alcohol consumption can support kidney health.
  • Follow Medical Advice: If you have a congenital or acquired UPJ obstruction, follow your healthcare provider’s advice regarding treatment and regular checkups.


UPJ obstruction, whether congenital or acquired, can impact kidney function and overall health. Timely diagnosis and appropriate treatment are crucial in managing the condition and preventing complications. While prevention of UPJ obstruction may not always be possible, a proactive approach to kidney health through lifestyle choices and regular medical checkups can contribute to better outcomes.

If you suspect you have UPJ obstruction or are experiencing symptoms related to this condition, seek prompt medical attention to receive an accurate diagnosis and appropriate treatment to protect your kidney health.

For more information on UPJ Obstruction