Kidney stones can be surprisingly unpredictable. Some people describe them as a dull ache that comes and goes. Others experience sudden, intense pain that starts in the side or back and seems to move toward the lower abdomen or groin. The experience can be frightening, particularly when the pain arrives without much warning.
Fortunately, not every kidney stone requires surgery. The right treatment depends on several things, including the stone’s size, location, composition, whether it is blocking urine flow, and whether it is causing infection or affecting kidney function.
Doctors may recommend simply waiting for a small stone to pass on its own. Larger or more difficult stones, however, may need to be removed using a procedure.
There are 4 methods for kidney stone removal that are commonly considered in clinical practice: extracorporeal shock wave lithotripsy, ureteroscopy, percutaneous nephrolithotomy, and, in selected situations, surgical stone removal. Each has a different role.
- Extracorporeal Shock Wave Lithotripsy (ESWL)
Extracorporeal shock wave lithotripsy, usually shortened to ESWL or SWL, is one of the better-known treatments for kidney stones.
The basic idea is fairly straightforward. Instead of making an incision to reach the stone, a specialised machine generates shock waves from outside the body. These waves are directed toward the stone and break it into smaller pieces.
Those smaller fragments can then pass through the urinary tract naturally.
ESWL is generally considered for selected stones, particularly when they are not too large and are located in a position that allows the shock waves to reach them effectively. Imaging is usually performed beforehand to determine the stone's size and exact location.
The procedure itself does not involve cutting into the kidney. Depending on the circumstances and local practice, pain relief or sedation may be provided.
After treatment, patients may notice blood in the urine, some discomfort, or pain as stone fragments pass. Drinking an appropriate amount of fluid may be recommended, although the exact advice depends on the patient's medical situation.
One important point is that ESWL does not always remove a stone in a single session. Larger or harder stones may require additional treatment. Stone fragments can also occasionally become lodged in the ureter, causing further discomfort or obstruction.
So while ESWL can be a useful option, it is not automatically the right treatment for every stone.
- Ureteroscopy
Ureteroscopy is another common approach, particularly when a stone is located in the ureter or in a part of the kidney that can be reached with a flexible scope.
Here, the doctor passes a thin instrument called a ureteroscope through the natural urinary passage. No external incision is usually needed.
Once the stone is located, the doctor can either remove it using specialised instruments or break it into smaller pieces, often with laser energy. The fragments can then be removed or allowed to pass naturally, depending on their size and the circumstances.
Ureteroscopy can be useful for stones that may not be suitable for ESWL. It can also provide a more direct approach because the doctor can see the stone rather than relying on shock waves from outside the body.
In some cases, a temporary ureteral stent may be placed after the procedure. A stent is a thin tube that helps urine drain from the kidney to the bladder while the urinary tract settles.
Some patients find stents uncomfortable. They may experience urinary frequency, urgency, bladder discomfort, or pain in the side, particularly during urination. These symptoms usually improve after the stent is removed.
Recovery varies depending on the procedure and the individual. Many patients can return to normal activities relatively quickly, but the treating team will provide specific instructions.
Ureteroscopy has become an important part of modern stone treatment because it can address stones in locations that are difficult to treat effectively with external shock waves.
- Percutaneous Nephrolithotomy (PCNL)
When a kidney stone is particularly large or complex, a more direct procedure may be necessary. This is where percutaneous nephrolithotomy, commonly called PCNL, may be considered.
PCNL is generally used for larger kidney stones, including stones that occupy a substantial portion of the kidney's collecting system.
Unlike ESWL and ureteroscopy, PCNL involves making a small opening through the skin of the back to access the kidney directly.
Through this opening, specialised instruments are introduced into the kidney. The stone can then be broken into pieces and removed.
It sounds considerably more invasive than the other options, and it is. But for large stones, trying to treat them with repeated less-invasive procedures may not always be the most practical approach. PCNL allows the surgeon to directly access and remove a significant amount of stone material.
It is also commonly considered for complex or branching stones, sometimes called staghorn stones, which can occupy multiple parts of the kidney's collecting system.
Because PCNL involves access through the skin and kidney tissue, patients generally require anaesthesia and a period of recovery. There are potential risks, including bleeding, infection, injury to surrounding structures, and the possibility that additional treatment may be needed.
The decision is therefore made after assessing the stone and the patient's overall health rather than simply choosing the most aggressive treatment available.
- Surgical Stone Removal
Traditional open surgery is now much less common for kidney stones because modern endoscopic and minimally invasive techniques can treat most stones without a large surgical incision.
However, surgical stone removal still has a place in selected and complicated cases.
For example, a person may have an unusual anatomical problem, a particularly complex stone burden, or another condition that makes standard stone procedures unsuitable. In such circumstances, a surgeon may consider a more conventional surgical approach.
The exact technique depends heavily on the patient's anatomy, the size and location of the stone, previous treatments, and whether another urinary tract problem needs to be addressed at the same time.
It is worth stressing that traditional surgery is not usually the first choice for an uncomplicated kidney stone. Advances in endourology have made less-invasive approaches possible for many patients.
Still, having surgery as an option is important when standard treatments are unlikely to provide a safe or effective solution.
Which Kidney Stone Removal Method Is Right for You?
Knowing the 4 methods for kidney stone removal is useful, but it doesn't mean you should try to decide on a procedure based on the number or size of the stone alone.
A 5 mm stone in one location may behave very differently from a similarly sized stone somewhere else.
Doctors usually consider factors such as:
Stone size
Stone location
Whether the stone is blocking urine flow
The number of stones present
Stone composition and hardness
Symptoms and pain severity
Presence of a urinary infection
Kidney function
Previous stone treatments
The patient's general health and medical history
Imaging tests, particularly ultrasound or CT scans when appropriate, can provide important information about the stone's position and size.
Sometimes the best treatment is actually no procedure at all.
Small stones may pass naturally, particularly when they are located in the ureter and are not causing complications. Your doctor may recommend pain management, fluids as appropriate, observation, and follow-up imaging.
That approach is very different from what is required for a large obstructing stone accompanied by infection.
When Is Kidney Stone Removal Urgent?
Most kidney stones are painful but not immediately dangerous. There are situations, however, where medical attention should not be delayed.
Seek urgent medical care if you have severe pain accompanied by:
Fever or chills
Difficulty passing urine
Very little or no urine
Persistent vomiting
Signs of infection
Severe weakness or feeling seriously unwell
Known kidney disease with new urinary obstruction
An infected, obstructed urinary system can become a serious medical emergency. In such situations, doctors may first need to relieve the obstruction and treat the infection before definitive stone removal is performed.
This is one reason it is important not to assume that every episode of kidney stone pain can simply be managed at home.
Can Kidney Stones Be Prevented?
Removing a stone solves the immediate problem, but it does not necessarily prevent another one.
People who have had kidney stones once may develop them again. The prevention plan depends partly on what caused the stone in the first place.
Adequate fluid intake is commonly an important part of prevention. Dietary recommendations may also be suggested depending on the type of stone and the individual's metabolic evaluation.
For recurrent stones, doctors may recommend analysing a passed or removed stone and performing urine or blood tests. This can help identify factors that increase the risk of stone formation.
For example, calcium oxalate stones, uric acid stones, struvite stones, and cystine stones have different underlying associations and may require different preventive strategies.
Simply drinking more water is helpful for many people, but recurrent stone disease deserves a more individualised approach.
Finding Appropriate Kidney Stone Care
If you are experiencing recurrent kidney stones, unexplained urinary pain, or symptoms that suggest a stone may be blocking the urinary tract, seeing a specialist can help clarify what is actually happening.
A Nephrology Hospital in Bahrain can provide assessment of kidney-related conditions and help coordinate appropriate investigations and treatment. Depending on the stone's location and complexity, care may involve nephrology as well as urology, particularly when a procedure is required.
The important thing is not to focus only on removing the stone. The bigger picture matters: why did the stone form, is the kidney functioning normally, is urine flowing properly, and what can be done to reduce the chance of another stone developing?
Final Thoughts
There is no single kidney stone treatment that works for everyone.
The four main approaches discussed here—extracorporeal shock wave lithotripsy, ureteroscopy, percutaneous nephrolithotomy, and selected surgical stone removal—serve different purposes. Smaller stones may sometimes be treated without a procedure, while larger, obstructing, or complex stones may require active removal.
If you have symptoms of a kidney stone, getting the stone properly assessed is the first step. Once its size and location are known, your healthcare team can discuss whether observation, ESWL, ureteroscopy, PCNL, or another approach makes sense for your particular situation.
And if severe pain is accompanied by fever, chills, difficulty urinating, or feeling acutely unwell, don't wait for the stone to pass on its own. Prompt medical assessment is important.
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