Kidney stones develop when certain substances in urine become concentrated enough to form crystals. These crystals can gradually combine and grow into a stone.

The substances involved may include calcium, oxalate, phosphorus, uric acid and cystine, depending on the type of stone. Low urine volume can make these substances more concentrated and increase the likelihood of crystal formation.

There is rarely just one reason why someone develops a kidney stone. A combination of fluid intake, diet, urine chemistry, genetics, medical conditions, medications and lifestyle factors may contribute.

Understanding the cause is particularly important for people who develop stones repeatedly because prevention can be tailored according to the individual's stone type and metabolic risk factors.

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides evaluation of kidney stone-related kidney problems and helps patients understand factors that may contribute to recurrent stones.

The Most Common Causes of Kidney Stones

1. Not Drinking Enough Fluids

One of the most important risk factors for kidney stones is producing too little urine.

When fluid intake is inadequate, urine becomes more concentrated. Higher concentrations of stone-forming substances can make crystal formation more likely.

Low fluid intake may become particularly important during:

• Hot weather

• Heavy physical activity

• Excessive sweating

• Fever

• Vomiting or diarrhea

• Long periods without drinking fluids

People who live or work in hot environments may therefore have an increased risk if they do not adequately replace fluid losses.

However, fluid recommendations should be individualized in people with kidney failure, heart failure or prescribed fluid restrictions.

2. Too Much Sodium in the Diet

A diet high in sodium can increase the amount of calcium excreted in urine.

For people prone to calcium stones, this can increase the urinary environment that favors stone formation.

Common sources of excess sodium can include:

• Packaged foods

• Processed snacks

• Pickles

• Instant foods

• Fast foods

• Salty sauces

• Processed meats

• Excess table salt

Reducing excessive sodium can be an important part of stone prevention.

3. High Intake of Certain Animal Proteins

A diet containing large amounts of animal protein can influence urine chemistry.

Depending on the individual, higher animal-protein intake may increase the risk of certain calcium or uric acid stones.

Foods that may contribute when consumed excessively include:

• Red meat

• Organ meat

• Poultry

• Fish

• Shellfish

• Eggs

This does not mean that everyone with kidney stones should completely eliminate protein.

The appropriate amount depends on the stone type, nutritional needs, kidney function and overall health.

4. High Oxalate in the Urine

Oxalate can combine with calcium and contribute to the formation of calcium oxalate stones.

Some foods contain relatively high amounts of oxalate, including:

• Spinach

• Peanuts

• Certain nuts

• Wheat bran

• Rhubarb

However, dietary recommendations should be individualized rather than assuming that every person with kidney stones must avoid all oxalate-containing foods.

Adequate dietary calcium is also important because calcium consumed with meals can bind oxalate in the digestive tract and reduce the amount absorbed.

5. Too Little Calcium in the Diet

An important misconception is that eating calcium automatically causes calcium kidney stones.

For many people with calcium oxalate stones, unnecessarily restricting dietary calcium may actually be counterproductive.

Calcium from food can bind oxalate in the digestive tract and reduce oxalate absorption.

Therefore, patients should not eliminate dairy or other calcium-rich foods simply because their stone contains calcium.

The recommended calcium intake should be individualized.

6. High Uric Acid in the Urine

Uric acid stones can develop when urine contains excessive uric acid and is too acidic.

Dietary patterns containing substantial amounts of purine-rich animal foods can contribute to higher uric acid levels in susceptible individuals.

Uric acid stones are different from calcium stones and may require a different prevention strategy.

In selected patients, treatment may include medicines that modify uric acid levels or urine chemistry.

7. Family History and Genetic Factors

Some people are naturally more likely to develop kidney stones because of their genetic background.

A person with a family history of kidney stones has a greater likelihood of developing them.

Certain inherited disorders can also directly increase stone formation.

For example, cystinuria is an inherited condition in which excessive cystine can enter the urine and form cystine stones.

Repeated stones at a young age or multiple affected family members may warrant a more detailed evaluation.

8. Previous Kidney Stones

Having had a kidney stone once does not necessarily mean the problem is permanently solved.

People who have formed a stone previously are more likely to develop another stone in the future.

This is why stone analysis and, in selected patients, metabolic evaluation can be useful.

Simply removing a stone does not necessarily eliminate the factors that caused it.

9. Obesity and Metabolic Factors

Being overweight or having obesity is associated with a higher risk of kidney stones.

Metabolic factors can influence urine composition and may particularly contribute to uric acid stone formation.

A gradual, sustainable approach to healthy weight management may therefore be beneficial for people at risk.

Extreme crash diets or rapid weight-loss programs should be avoided without appropriate medical guidance.

10. Gout and High Uric Acid

People with gout may have abnormalities in uric acid metabolism that increase the risk of uric acid stones.

High uric acid levels in the blood do not automatically mean that a person will develop kidney stones, but gout and urinary uric acid abnormalities can be relevant risk factors.

A doctor may recommend blood and urine testing when clinically appropriate.

11. Hypercalciuria

Hypercalciuria means that an unusually large amount of calcium is present in the urine.

It is one of the important metabolic abnormalities found in people who form calcium stones.

It may occur because of inherited tendencies, dietary factors or other medical conditions.

A 24-hour urine evaluation may help identify excessive urinary calcium in selected recurrent stone formers.

12. Hyperoxaluria

Hyperoxaluria occurs when excessive oxalate is present in the urine.

It can contribute to calcium oxalate stone formation.

Causes may include dietary factors, intestinal conditions, genetic disorders or changes in oxalate absorption and metabolism.

People with recurrent calcium oxalate stones may require a more detailed metabolic assessment to determine whether hyperoxaluria is contributing.

13. Hyperparathyroidism

The parathyroid glands help regulate calcium levels in the body.

In hyperparathyroidism, excessive parathyroid hormone can increase blood calcium and contribute to calcium stone formation in susceptible patients.

If kidney stones repeatedly occur together with abnormal calcium levels, a doctor may consider evaluating parathyroid function.

Treating the underlying disorder can be important for preventing further stones.

14. Recurrent Urinary Tract Infections

Some kidney stones, particularly struvite stones, are associated with urinary tract infections caused by certain bacteria.

These stones can sometimes grow quickly and become large.

People who repeatedly develop UTIs and stones may require evaluation for both infection and urinary tract abnormalities.

A stone associated with infection should not be managed only by increasing water intake.

15. Certain Digestive Diseases

Some gastrointestinal conditions can increase kidney stone risk.

Long-standing intestinal inflammation, certain digestive disorders and previous gastrointestinal surgery can affect the absorption and excretion of substances involved in stone formation.

This can be particularly relevant in people who develop recurrent calcium oxalate stones.

16. Renal Tubular Acidosis

Certain disorders affecting the kidney's ability to regulate acid-base balance can increase the risk of kidney stones.

Renal tubular acidosis is one condition associated with stone formation.

Patients with recurrent stones, abnormal blood chemistry or certain electrolyte disturbances may require specialized evaluation.

17. Urinary Tract Abnormalities or Obstruction

Problems affecting the normal flow of urine can contribute to urinary stone complications.

A blockage may interfere with urine drainage and, depending on the situation, may increase the risk of infection or other stone-related problems.

Imaging can help identify urinary tract abnormalities when they are suspected.

18. Certain Medicines and Supplements

Some medicines can increase the risk of kidney stones in susceptible people.

Examples identified by NIDDK include long-term use of certain diuretics, calcium-based antacids, topiramate and indinavir.

This does not mean that people should stop prescribed medicines on their own.

If you have recurrent stones, tell your doctor about all prescription medicines, over-the-counter products and supplements you use.

What Are the Different Types of Kidney Stones?

Understanding the stone type can help explain why it formed.

Calcium Stones

Calcium stones are the most common type and include:

• Calcium oxalate stones

• Calcium phosphate stones

They may be associated with abnormalities such as high urinary calcium, high oxalate, low urinary citrate and other metabolic factors.

Uric Acid Stones

These stones are associated with acidic urine and increased urinary uric acid.

Diet, obesity, gout and metabolic factors may contribute in susceptible individuals.

Struvite Stones

Struvite stones are associated with certain urinary infections.

They can sometimes enlarge rapidly and may form large branching stones.

Cystine Stones

Cystine stones occur because of the inherited condition cystinuria.

They are less common than calcium stones but can cause recurrent stone formation.

Why Knowing the Stone Type Matters

Two people can both have kidney stones but need completely different prevention strategies.

For example:

• A calcium oxalate stone may require attention to sodium, oxalate, calcium intake and urinary chemistry.

• A uric acid stone may require attention to urine acidity and uric acid metabolism.

• A struvite stone requires attention to infection.

• A cystine stone may require specialized long-term prevention.

When a stone is passed or removed, laboratory stone analysis can help identify its composition. A doctor may also recommend urine testing, including a 24-hour urine collection, for selected patients.

What Tests Can Identify the Cause of Recurrent Kidney Stones?

If stones are recurring, a doctor may investigate more than just the stone visible on imaging.

Evaluation can include:

Urine Examination

Urinalysis can identify blood, infection and other abnormalities.

Blood Tests

Depending on the situation, testing may include:

• Calcium

• Uric acid

• Creatinine

• Electrolytes

• Bicarbonate

• Other relevant metabolic tests

Stone Analysis

If a stone is passed or removed, laboratory analysis can determine its composition.

24-Hour Urine Testing

This can provide information about:

• Urine volume

• Calcium

• Oxalate

• Uric acid

• Citrate

• Sodium

• Other stone-forming factors

The exact evaluation depends on the patient's history and recurrence risk.

Can Kidney Stones Be Prevented?

In many people, the risk of future stones can be reduced by identifying and addressing contributing factors.

General measures may include:

• Maintain appropriate fluid intake.

• Reduce excessive dietary sodium.

• Follow an individualized eating plan.

• Avoid excessive animal protein when advised.

• Maintain appropriate dietary calcium.

• Maintain a healthy body weight.

• Treat recurrent urinary infections.

• Take prescribed preventive medicines correctly.

• Complete metabolic testing when recommended.

Adequate fluid intake is particularly important because it helps dilute urine and reduce the concentration of stone-forming substances.

However, people with kidney failure, heart failure or prescribed fluid restrictions should follow their healthcare professional's individualized fluid plan rather than automatically increasing water intake.

Does Drinking More Water Prevent All Kidney Stones?

No.

Adequate hydration is one of the most important general preventive measures, but kidney stones can develop for many different reasons.

A person with a genetic condition, severe metabolic abnormality, recurrent infection or another strong risk factor may require additional treatment.

The goal is usually to maintain sufficient urine volume while addressing the specific abnormality responsible for stone formation.

Can Kidney Stones Be Caused by Food Alone?

Usually, kidney stone formation is more complicated than simply eating one particular food.

Diet can influence urine chemistry, but genetics, fluid intake, medical conditions, medications and metabolic abnormalities also matter.

For this reason, extremely restrictive diets are not appropriate for everyone with kidney stones.

A prevention plan should be based on the individual's stone composition and metabolic evaluation when indicated.

When Should Recurrent Kidney Stones Be Evaluated by a Specialist?

Specialist assessment is particularly useful when stones:

• Occur repeatedly

• Begin at a young age

• Affect both kidneys

• Are unusually large

• Occur with recurrent UTIs

• Cause urinary obstruction

• Are associated with reduced kidney function

• Occur despite preventive measures

• Occur in several family members

A nephrologist can evaluate kidney function and metabolic risk factors, while a urologist may be needed when a stone requires a surgical or endoscopic procedure.

When Can a Kidney Stone Become Urgent?

A kidney stone requires prompt medical attention when it is associated with concerning symptoms such as:

• Fever or chills

• Severe or worsening pain

• Persistent vomiting

• Very little or no urine

• Blood in urine with worsening symptoms

• Signs of urinary obstruction

• Sudden deterioration in health

A stone that blocks urine flow can cause serious complications, particularly when infection is also present.

Kidney Stone Cause and Prevention Evaluation at Prabhakar Bhurke Clinic

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized kidney evaluation for patients with recurrent or complicated kidney stones.

Depending on the patient's situation, evaluation may include:

• Review of previous stone episodes

• Kidney-function assessment

• Urine examination

• Metabolic risk assessment

• Review of stone-analysis reports

• Evaluation of recurrent urinary infections

• Assessment of dietary and lifestyle factors

• Review of medications and supplements

• Evaluation of kidney stones associated with reduced kidney function

• Preventive kidney-stone planning

• Coordination with appropriate urological specialists when stone removal is required

The purpose is not only to address an existing stone but also to understand why stones are forming and how future episodes may be reduced.

Frequently Asked Questions

What is the most common cause of kidney stones?

Kidney stones form when certain substances become sufficiently concentrated in urine to crystallize. Inadequate fluid intake, high urinary calcium or oxalate, dietary factors, genetics and certain medical conditions can contribute.

Does dehydration cause kidney stones?

Dehydration can increase stone risk because it reduces urine volume and makes urine more concentrated. Maintaining appropriate hydration is an important part of prevention.

Can eating too much salt cause kidney stones?

A high-sodium diet can increase urinary calcium and may raise the risk of calcium stones in susceptible people.

Does calcium cause kidney stones?

Not necessarily. Adequate dietary calcium can actually help reduce oxalate absorption. People with calcium stones should not automatically eliminate calcium from their diet.

Can meat cause kidney stones?

High intake of animal protein may increase the risk of certain kidney stones, particularly in susceptible individuals. The appropriate amount depends on the person's stone type and overall health.

Can kidney stones run in families?

Yes. A family history of kidney stones increases the likelihood of developing them, and some inherited disorders directly cause recurrent stones.

Why do kidney stones keep coming back?

Recurrent stones may result from persistent metabolic abnormalities, inadequate hydration, dietary factors, genetic conditions, recurrent infections or other underlying causes. Stone analysis and metabolic evaluation can help identify the reason.

Can a urinary infection cause kidney stones?

Certain urinary infections can lead to struvite stones. These stones can grow rapidly and may become large.

What tests can find the cause of recurrent kidney stones?

Depending on the situation, doctors may use stone analysis, blood tests, urinalysis and 24-hour urine testing to identify metabolic and dietary risk factors.

Conclusion

There are many common causes of kidney stones, and stone formation is usually the result of several interacting factors rather than one single food or habit.

Low urine volume, high sodium intake, dietary patterns, abnormal urinary calcium or oxalate, high uric acid, obesity, family history, recurrent urinary infections, certain medical conditions and some medicines can all contribute to stone formation.

The type of stone matters because prevention is not the same for everyone. Calcium, uric acid, struvite and cystine stones have different underlying mechanisms and may require different preventive strategies.

If kidney stones keep returning, a specialist evaluation can help identify the metabolic or medical factors responsible. Understanding the cause can make prevention more targeted than simply treating each stone episode individually.

For individualized evaluation of recurrent kidney stones and kidney health, consult Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic.

Medical Disclaimer

This article is intended for general educational and informational purposes only and should not be considered a substitute for medical diagnosis, treatment or individualized medical advice. Kidney stones can have multiple causes, and the appropriate prevention strategy depends on stone composition, kidney function, medical history, diet, medications and metabolic findings. Do not make major dietary changes, restrict calcium or protein, increase fluid intake substantially, or start supplements or preventive medicines without professional guidance. People with kidney failure, heart failure or fluid restrictions should follow their prescribed fluid plan. Seek prompt medical attention for severe or worsening stone pain, fever, chills, persistent vomiting, very little or no urine, or symptoms suggesting urinary obstruction or infection. Consult Dr. Sandip Prabhakar Bhurke or another qualified nephrologist or urology specialist for personalized care.