Obstruction of the ureteropelvic junction causes symptoms and treatment

Imagine that your kidneys are working normally, but in complete silence a small blockage is forming in the pathway where urine exits the kidney… a mild obstruction at a point called the ureteropelvic junction. Over time, this seemingly minor issue can develop into a serious condition that may threaten kidney function without causing any obvious symptoms in the early stages.Ureteropelvic junction obstruction (UPJ obstruction) is one of the hidden kidney problems that is often discovered accidentally during routine medical examinations. However, in some cases, it may lead to severe pain, recurrent infections, or gradual deterioration of kidney function if left untreated.The challenge with this condition is that it is often silent in its early stages, which makes it potentially dangerous. The good news is that early diagnosis and proper treatment can preserve kidney function and prevent future complications.In this article from Delili Medical, we will explore everything you need to know about ureteropelvic junction obstruction: its causes, symptoms, diagnostic methods, and the latest treatment options in a simple and easy-to-understand way, so you can fully understand the condition and feel reassured about your health.

❓ What is ureteropelvic junction (UPJ) obstruction?

Ureteropelvic junction obstruction is a condition that occurs at the point where the ureter (the tube that carries urine from the kidney to the bladder) connects to the renal pelvis (the area inside the kidney that collects urine).

This obstruction prevents normal urine flow from the kidney to the bladder, causing urine to build up inside the kidney. This condition is known as hydronephrosis (kidney swelling). If left untreated, it may eventually lead to damage of kidney tissue over time.

The condition may affect one kidney or both kidneys. It can be congenital (present at birth) or acquired later in life due to different causes.

❓ Is UPJ obstruction hereditary?

In some cases, it may have a genetic component, but most cases are congenital without a clear hereditary cause.

❓ Does UPJ obstruction affect pregnancy in women?

In mild and stable cases that are regularly monitored, it usually does not affect pregnancy.
However, in severe cases, close medical monitoring is recommended to check kidney function during pregnancy.

❓ Can exercise affect the condition?

Light to moderate exercise usually does not affect the condition.
However, intense or high-impact sports may increase discomfort in some cases.

❓ Can UPJ obstruction be detected in adults?

Yes. It can be detected in adults, often accidentally during ultrasound or imaging tests done for other reasons such as pain or urinary tract infections.

❓ Why does pain increase after drinking water?

Drinking large amounts of water increases urine production. If there is an obstruction in urine drainage, pressure builds up inside the kidney, causing pain in the flank or back.

❓ Can routine lab tests detect UPJ obstruction?

No ❌
Urine and blood tests are usually normal and are not enough to diagnose the condition.
Accurate diagnosis depends on imaging tests such as ultrasound and nuclear kidney scans.

❓ Does kidney swelling mean immediate surgery?

Not necessarily.
The decision depends on:

Kidney function
Severity of obstruction
Presence of symptoms such as pain or recurrent infections

❓ Can UPJ obstruction occur in only one kidney?

Yes. It most commonly affects one kidney, while the other kidney remains normal.

❓ Are stents a permanent treatment?

No ❌
JJ stents are temporary and are used before or after surgery or to relieve obstruction for a limited time.

❓ Does delaying treatment cause complications?

Yes. In some cases, delay may lead to:

Gradual decline in kidney function
Recurrent urinary tract infections

Early medical follow-up is very important.

❓ Is UPJ obstruction dangerous?

Not always.
Mild cases may remain stable without complications.
Danger appears when there is:

Severe kidney swelling
Decline in kidney function over time

❓ Can UPJ obstruction disappear without treatment?

In some mild cases, especially in children, it may remain stable or improve.
However, most moderate and severe cases do not resolve on their own and require monitoring or treatment.

❓ Do all cases require surgery?

No ❌
Surgery is needed only in cases with:

Severe or recurrent pain
Declining kidney function
Recurrent urinary infections

❓ Does UPJ obstruction affect the kidney?

Yes, if untreated, it may lead to:

Kidney swelling (hydronephrosis)
Gradual loss of kidney function

❓ Is surgery dangerous?

No, it is generally safe, especially with modern techniques.
Success rates are very high, particularly with laparoscopic and robotic surgery.

❓ Can the obstruction return after surgery?

This is rare. Most surgeries have high long-term success rates, especially when performed by specialists.

❓ Can patients live a normal life?

Yes ????
Most patients can return to a normal life after treatment or proper monitoring, with no major impact on daily activities.

???? Stages of UPJ obstruction

Stages are based on the degree of kidney swelling (hydronephrosis) and kidney function.

???? Stage 1 (very mild)

Mild dilation of the renal pelvis
Normal kidney function
Usually no symptoms
Often discovered accidentally

???? Stage 2 (mild to moderate)

More visible dilation
Early urine accumulation
Mild flank pain
Normal kidney function in most cases

???? Stage 3 (moderate to severe)

Significant dilation
Beginning thinning of kidney tissue
Recurrent flank pain
Possible urinary tract infections

???? Stage 4 (severe)

Severe kidney dilation
Marked thinning of kidney tissue
Reduced kidney function
Strong pain, vomiting, and recurrent infections

⚠️ Causes of UPJ obstruction

1. Congenital causes (most common)

Narrowing at the junction
Improper development of muscles in the area
Twisting or abnormal structure of the ureter

2. Abnormal blood vessels

Extra artery or vein compressing the ureter
Causes blockage, especially with kidney movement

3. Recurrent urinary tract infections

Chronic infections may lead to scarring or narrowing over time

4. Kidney stones

Kidney stones may directly cause blockage or put pressure on the ureteropelvic junction (UPJ), leading to obstruction.

5. Rare causes (such as tumors)

Tumors in the kidney or surrounding tissues may compress the ureter, leading to obstruction at the UPJ.

6. Post-surgical or traumatic causes

Previous surgeries or injuries may result in scarring or fibrosis, which can cause narrowing of the UPJ over time.

❗ Symptoms of Ureteropelvic Junction (UPJ) Obstruction

Symptoms vary depending on the severity and speed of progression. In some cases, the condition may be obvious, while in others it is discovered accidentally during routine examinations.

???? Main symptoms:

1. Flank or lower back pain

One of the most common symptoms
May worsen after drinking large amounts of fluids
Can appear as recurrent episodes that come and go

2. Kidney enlargement

Clearly visible on ultrasound
May occur without noticeable symptoms in some cases

3. Recurrent urinary tract infections

Burning sensation during urination
Fever or chills
Increased frequency of urination

4. Nausea or vomiting

Usually occurs in severe cases or during pain episodes

5. Blood in urine (in some cases)

Urine may appear pink or dark in color

6. Decreased kidney function (advanced cases)

Detected through blood tests or nuclear kidney scans

???? Diagnosis of UPJ Obstruction

The condition is diagnosed using several medical tests to determine the severity of the obstruction and its effect on kidney function.

???? Diagnostic steps:

1. Ultrasound (Sonography)

The first and most important diagnostic tool
Shows dilation of the renal pelvis (hydronephrosis)
May detect kidney enlargement

2. Contrast imaging (IVU or CT Urogram)

Provides detailed images of the kidneys and ureters
Helps locate the exact site of obstruction
Determines whether the obstruction is partial or complete

3. Nuclear renal scan (MAG3 or DTPA)

The most important test for assessing kidney function
Measures how well each kidney works
Evaluates urine drainage efficiency
Determines the functional impact of the obstruction

4. Urine analysis

Helps detect infections
May show blood in urine
Does not directly diagnose the obstruction

5. CT scan (in selected cases)

Used in complex cases
Helps detect external causes such as stones or tumors

⚠️ Complications of UPJ Obstruction

Complications occur when the obstruction persists for a long time without treatment.

1. Hydronephrosis (kidney swelling)

Occurs due to urine buildup inside the kidney
Increases pressure inside the kidney over time

2. Reduced or loss of kidney function

Continuous pressure damages kidney tissue gradually
May lead to partial or significant loss of function

3. Recurrent urinary tract infections

Urine stagnation promotes bacterial growth
Can lead to frequent and sometimes severe infections

4. Kidney stone formation

Slow urine flow increases salt deposition
Raises the risk of stone formation in the kidney

5. Chronic flank pain

Caused by increased pressure inside the kidney
May be persistent or recurrent

6. Severe complications in advanced untreated cases

Significant decline in kidney function
Partial atrophy (shrinkage) of kidney tissue may occur

???? Medical treatment of Ureteropelvic Junction (UPJ) obstruction

Medical treatment for ureteropelvic junction obstruction is considered symptomatic treatment only. It aims to relieve symptoms and control complications, but it does not treat the underlying cause of the obstruction. The condition is medically known as Ureteropelvic junction obstruction (UPJ obstruction).

1. ???? Pain relievers

Used to reduce flank pain episodes, including:

Paracetamol (Acetaminophen)
Non-steroidal anti-inflammatory drugs (NSAIDs) such as Ibuprofen

???? Purpose:

Relieve flank or lower back pain
Reduce pain-related spasms

⚠️ These medications should be used under medical supervision, especially in cases of impaired kidney function.

2. ???? Antibiotics (if infection is present)

Used in cases of active or recurrent urinary tract infections, such as:

Amoxicillin / Clavulanic acid
Cephalosporins
Stronger antibiotics depending on urine culture results

???? Purpose:

Treat urinary tract infections
Prevent spread of infection to the kidney (pyelonephritis)

3. ???? Antispasmodic drugs

May be used in some cases, such as:

Antispasmodic medications

???? Purpose:

Reduce colicky pain
Improve patient comfort during pain episodes

4. ???? Kidney-supportive medications

Used depending on the patient’s condition, such as:

Regulation of fluids and electrolytes
Management of kidney function abnormalities or elevated creatinine levels

⚠️ Note:
These medications do not treat the obstruction itself; they only support overall kidney function.

⚠️ Important note:

There is no medication that can:

Permanently open the obstruction ❌
Treat the root cause of the disease ❌

If the obstruction affects kidney function, the real management includes:

Close monitoring
Surgical or endoscopic intervention when needed

???? Surgical treatment of UPJ obstruction

Surgery is the main treatment option for moderate to severe cases of ureteropelvic junction obstruction or when kidney function is affected. The condition is medically known as UPJ obstruction.

The goal of surgery is to remove the narrowed segment and reconnect the ureter to the renal pelvis to restore normal urine flow.