Kidney Stone Treatment: Which Treatment Is Right for Different Stone Sizes?
A kidney stone can be tiny and still cause considerable pain. Some stones pass naturally, while others get stuck in the urinary tract and need medical attention. The treatment depends on the stone’s size, location and whether it is blocking the flow of urine.
Our kidney stone treatment in Chennai begins with understanding these factors. Not every stone needs surgery, and not every large stone can be treated in the same way.
What Are Kidney Stones?
Kidney stones are hard deposits formed when minerals and salts in the urine crystallise. They can range from tiny particles to larger stones that may obstruct the urinary tract.
Some stones are discovered during a scan for an unrelated problem. Others cause symptoms when they move from the kidney into the ureter, the tube that carries urine to the bladder
Common symptoms include:
- Sharp pain in the back, side or lower abdomen.
- Pain that spreads towards the groin.
- Blood in the urine.
- Nausea or vomiting.
- Pain or discomfort while passing urine.
- A frequent or urgent need to urinate.
If you have severe pain, fever, chills or difficulty passing urine, seek prompt medical attention. A stone associated with infection or urinary obstruction may need urgent treatment.
Does Kidney Stone Size Determine the Treatment?
Stone size is an important factor, but it is not the only one. A small stone may pass naturally, while another of the same size may become stuck and cause a blockage.
Before recommending treatment, the doctor considers:
- The size and location of the stone.
- Whether urine flow is obstructed.
- The severity of pain and other symptoms.
- Whether an infection is present.
- Kidney function and the patient’s overall health.
These findings help determine which kidney stone treatment options are appropriate, from observation and medication to procedures that break up or remove the stone.
Kidney Stone Treatment Based on Size
The following size ranges are general guides. The final treatment decision depends on the individual case.
1. Small Stones: Less Than 5 mm
Small stones have a better chance of passing naturally, particularly when they are located in the ureter and are not causing complications.
The doctor may recommend:
- Observation to see whether the stone passes.
- Appropriate pain relief.
- Medication in selected cases to help the stone pass.
- Follow-up imaging when needed to confirm that the stone has cleared.
Drinking enough fluids is important, but forcing excessive amounts of water will not necessarily make a stone pass faster. Follow your doctor’s advice, especially if you have another condition that affects fluid intake.
2. Medium-Sized Stones: Around 5 to 10 mm
Stones in this range may pass naturally, but the chances are lower than for smaller stones. Their location also matters.
If the stone does not pass or causes persistent pain or obstruction, the doctor may consider:
- Shock wave lithotripsy (SWL): Shock waves are directed at the stone from outside the body to break it into smaller fragments.
- Ureteroscopy: A thin scope is passed through the urinary tract to reach the stone. The surgeon may break it with a laser and remove the fragments.
- Medication: In selected cases, medicines may help a ureteric stone pass.
The choice depends on the stone’s size, location, density and the patient’s symptoms.
3. Larger Stones: Around 10 to 20 mm
Larger stones are less likely to pass naturally and may require a procedure. A stone in the kidney may need a different treatment from one lodged in the ureter.
Possible options include:
- Shock wave lithotripsy: May be suitable for selected stones, although more than one session may be required.
- Ureteroscopy with laser treatment: Allows the surgeon to reach and break up stones in the ureter and selected kidney stones.
- Percutaneous nephrolithotomy (PCNL): May be considered for larger or complex kidney stones. The surgeon accesses the kidney through a small incision in the back to break up and remove the stone.
The doctor will recommend a procedure based on the scan findings and the likelihood of clearing the stone safely.
4. Very Large Stones: More Than 20 mm
Very large kidney stones are unlikely to pass naturally. For many kidney stones larger than 20 mm, PCNL is a commonly recommended treatment.
During the procedure, the surgeon makes a small incision in the back and passes specialised instruments into the kidney to break up and remove the stone.
Some complex stones may occupy several parts of the kidney and require a carefully planned approach. The treatment plan may also depend on the patient’s overall health and whether an infection is present.
Remember, these size categories are not strict rules. A smaller stone can still require urgent intervention if it causes infection or blocks urine flow.
What Are the Different Kidney Stone Removal Procedures?
When a stone is unlikely to pass naturally or is causing complications, kidney stone removal may be recommended. The procedure depends on where the stone is located and how large or complex it is.
Shock Wave Lithotripsy
- Uses shock waves generated outside the body to break the stone into smaller pieces.
- The fragments pass out through the urine.
- It may be suitable for selected stones, depending on their size, location and other factors.
Ureteroscopy with Laser Lithotripsy
- A thin scope is passed through the urethra and bladder into the urinary tract.
- The surgeon locates the stone and uses a laser to break it into smaller fragments.
- The fragments may be removed using a small basket or allowed to pass naturally.
Percutaneous Nephrolithotomy
- Often considered for larger or complex kidney stones.
- A small incision is made in the back to access the kidney.
- Specialised instruments are used to break up and remove the stone.
Some patients may need a temporary ureteral stent after treatment to help urine drain. Your doctor will explain whether this is necessary and when it should be removed.
How Are Kidney Stones Diagnosed?
Before deciding on treatment, the doctor needs to understand the stone’s size, location and effect on the urinary tract.
Investigations may include:
- Ultrasound: Helps identify stones and assess the urinary tract.
- CT scan: Provides detailed information about the stone’s size and location when needed.
- Urine tests: Help check for infection and other abnormalities.
- Blood tests: May be used to assess kidney function and related factors.
The results help the doctor decide whether the stone can be monitored or requires treatment. If you have had kidney stones before, further testing may also help identify why they keep forming.
Can Kidney Stones Be Prevented?
Having one kidney stone can increase the risk of developing another. A few changes may help reduce that risk, although prevention depends partly on the type of stone.
Here are some practical steps:
- Drink enough water throughout the day, unless your doctor has advised you to restrict fluids.
- Reduce excess salt in your diet.
- Follow dietary advice based on the type of stone you have had.
- Take prescribed medication as directed.
- Attend follow-up appointments if you have recurrent stones.
If possible, your doctor may recommend analysing a passed or removed stone. Knowing its composition can help guide dietary changes and preventive treatment.
Frequently Asked Questions
Yes, many stones of this size pass naturally. However, the likelihood depends on where the stone is located and whether it is causing complications. Your doctor can advise whether observation is appropriate.
There is no single size at which every stone requires surgery. Larger stones are more likely to need a procedure, but even a small stone may need urgent treatment if it causes infection or obstructs urine flow.
Neither treatment is best for every patient. Laser treatment through ureteroscopy and shock wave lithotripsy are suitable for different situations. The stone's size, location and other clinical factors guide the decision.
Recovery depends on the procedure and your overall health. Some patients return home on the same day after minimally invasive treatment, while others may need a longer hospital stay or additional recovery time.
Yes. Removing a stone does not eliminate the factors that caused it to form. Adequate fluid intake, appropriate dietary changes and follow-up care can help reduce the risk of recurrence.
Seek medical advice if you have recurring pain in your side or back, blood in your urine or difficulty passing urine. A kidney stone specialist in Chennai can assess your symptoms, review your investigations and recommend a treatment plan suited to your condition.
Medical References
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Treatment for Kidney Stones
- Cleveland Clinic. Kidney Stones: Causes, Symptoms, Diagnosis and Treatment
- National Institute for Health and Care Excellence (NICE). Renal and Ureteric Stones: Assessment and Management
- NHS. Kidney Stones