Kidney stones can be painful, confusing, and stressful. Many people have questions about what causes them, how they are diagnosed, how they are treated, and whether they can be prevented. Others hear conflicting advice about water, calcium, diet, medications, supplements, or home remedies.
At Florida Kidney Physicians, our goal is to help patients understand kidney stones in a clear and practical way, consistent with patient-education guidance from recognized kidney and urology organizations such as the National Kidney Foundation and the American Urological Association. This guide answers common questions, clarifies frequent myths, and explains when it is important to seek medical care.
What Are Kidney Stones?
Kidney stones are hard deposits that form inside the kidneys when minerals and salts in the urine become concentrated and crystallize. These stones can vary in size. Some remain in the kidney, while others move into the ureter, the tube that carries urine from the kidney to the bladder.
A kidney stone may pass on its own, but some stones can cause severe pain, block urine flow, trigger infection, or require medical treatment. The best approach depends on the stone’s size, location, composition, symptoms, and the patient’s overall health.
The main types of kidney stones include:
- Calcium oxalate or calcium phosphate stones: These are among the most common types. They may be related to urine calcium, oxalate, sodium intake, hydration, and other metabolic factors.
- Uric acid stones: These may form when urine is too acidic and can be associated with gout, certain dietary patterns, or metabolic conditions.
- Struvite stones: These can develop in connection with certain urinary tract infections and may grow quickly.
- Cystine stones: These are less common and are related to a rare inherited condition that causes cystine to build up in the urine.
Knowing the type of stone is important because prevention strategies are not the same for every patient.
Stone Type and Common Prevention Focus
This table is a general overview. A patient’s prevention plan should be based on their stone type, urine chemistry, kidney function, medical history, and clinician recommendations.
| Stone Type | Often Related To | Prevention May Focus On |
|---|---|---|
| Calcium oxalate or calcium phosphate | Calcium, oxalate, sodium, urine volume, urine chemistry | Fluids, sodium reduction, appropriate dietary calcium, oxalate guidance when indicated |
| Uric acid | Acidic urine, gout, metabolic factors, certain dietary patterns | Urine pH, uric acid management, diet adjustments, medications when needed |
| Struvite | Certain urinary tract infections | Infection treatment, follow-up imaging, and stone removal when needed |
| Cystine | Inherited cystinuria | Higher fluid goals, specialized medical care, urine chemistry management |
What Causes Kidney Stones?
Kidney stones can form for several reasons. In many cases, more than one factor is involved.
Common contributors include:
- Not drinking enough fluid, which can make urine more concentrated.
- Low urine volume, which allows minerals and salts to become more concentrated and more likely to crystallize.
- High levels of certain minerals or salts in the urine, such as calcium, oxalate, uric acid, or phosphate.
- High sodium intake, which may increase urinary calcium excretion in some patients. More calcium in the urine can increase the risk of certain calcium-based stones.
- Certain dietary patterns, including high intake of animal protein for some stone types.
- Family history, which may increase a person’s risk.
- Medical conditions, such as gout, recurrent urinary tract infections, obesity, digestive conditions, or parathyroid disease.
- Certain medications or high-dose supplements, such as vitamin C, which the body can convert into oxalate, depending on the patient’s clinical history.
Because the cause can vary, prevention is most effective when it follows a clear sequence: stone type → urine chemistry → prevention plan.
How Do I Know If I Have Kidney Stones?
Kidney stones do not always cause symptoms. Some small stones may be found during imaging tests for another reason. When symptoms do occur, they can be intense.
Possible symptoms include:
- Sharp pain in the back, side, lower abdomen, or groin.
- Pain that comes in waves.
- Blood in the urine, which may look pink, red, or brown.
- Pain or burning with urination.
- A frequent or urgent need to urinate.
- Nausea or vomiting.
- Cloudy or foul-smelling urine.
- Difficulty urinating or passing only a small amount of urine.
Back or side pain can have many causes. Imaging and urine testing may be needed to confirm whether a kidney stone is present.
How Are Kidney Stones Diagnosed?
Kidney stones are usually diagnosed through a combination of symptoms, medical history, physical evaluation, and testing. A clinician may recommend:
- Urinalysis: A urine test can look for blood, minerals that may form stones, signs of infection, and other abnormalities.
- Blood tests: Bloodwork may help evaluate kidney function, calcium levels, uric acid, infection markers, or other metabolic factors.
- Imaging tests: Ultrasound, X-ray, or CT imaging may be used to locate a stone, estimate its size, and identify whether it is blocking urine flow.
- Stone analysis: If a stone is passed or removed, laboratory analysis can identify its composition.
- 24-hour urine collection: For recurrent stones or higher-risk patients, this test can measure urine volume, calcium, oxalate, citrate, uric acid, sodium, and other factors that guide prevention.
Diagnosis matters because treatment and prevention depend on the stone’s size, location, type, and whether infection or obstruction is present.
When Should I Seek Medical Care?
Patients should seek prompt medical attention if they have symptoms that may suggest a kidney stone, especially if pain is severe or does not improve.
A kidney stone with fever, chills, or inability to urinate can be serious because it may involve infection, blockage, or both.
| Call Your Doctor | Seek Urgent Care |
|---|---|
| Mild symptoms that are improving | Fever or chills |
| Questions about kidney stone prevention | Vomiting or inability to keep fluids down |
| History of recurrent stones | Severe or worsening pain |
| Questions about diet, fluids, calcium, oxalate, sodium, or supplements | Blood in the urine with significant pain or other symptoms |
| Follow-up after passing a stone | Inability to urinate or passing only a very small amount |
| Review of imaging, urine testing, or 24-hour urine results | Symptoms in a patient with one kidney, pregnancy, chronic kidney disease, or a history of complicated stones |
These symptoms may indicate a stone, infection, blockage, or another condition that needs timely care.
Can Kidney Stones Be Prevented?
In many cases, the risk of future kidney stones can be reduced. However, prevention should be individualized. The most useful prevention plan is often based on stone analysis and/or a 24-hour urine collection, especially for patients with recurrent stones.
A prevention plan may include:
- Drinking enough fluids to keep urine diluted, if safe for the patient.
- For many stone formers, clinicians may recommend enough fluid intake to produce at least 2.5 liters of urine per day, when safe for the patient.
- Reducing sodium intake when recommended.
- Adjusting animal protein intake for certain stone types.
- Getting the right amount of dietary calcium.
- Limiting specific high-oxalate foods only when urine testing or stone type suggests it may help, under professional guidance, especially for patients with concurrent kidney disease who must also monitor potassium intake.
- Managing uric acid, citrate, calcium, or other urine chemistry findings.
- Reviewing medications and supplements, including high-dose vitamin C, with a healthcare professional.
- Treating underlying medical conditions that increase stone risk.
- Using medications when recommended by a physician.
Patients should not make extreme diet changes without medical guidance. This is especially important for people with chronic kidney disease, heart failure, diabetes, gout, recurrent urinary tract infections, or fluid restrictions.
What Are the Treatment Options for Kidney Stones?
Treatment depends on the stone’s size, location, type, symptoms, and whether there is infection or blockage.
Treatment for a current stone is not the same as prevention of future stones. A patient may need short-term care to manage pain, infection risk, or obstruction, and a separate long-term prevention plan to reduce recurrence.
Common treatment approaches include:
Observation and Symptom Management
Small stones may pass on their own. A physician may recommend fluids if safe, pain control, and monitoring. In some cases, medication may be prescribed to help the ureter relax and allow the stone to pass more easily, sometimes called medical expulsive therapy.
Medications to Help Prevent Recurrence
Medications do not dissolve all kidney stones. Some medicines may help prevent new stones or reduce recurrence, depending on the stone type and urine chemistry. For example, certain patients may benefit from medications that affect urine citrate, uric acid, calcium levels, or urine pH.
A physician can determine whether medication is appropriate based on testing, stone type, kidney function, and clinical history.
Procedures to Remove or Break Stones
Larger stones, stones that block urine flow, stones associated with infection, or stones causing severe symptoms may require a procedure. Options may include shock wave lithotripsy, ureteroscopy, or percutaneous nephrolithotomy. The right option depends on the stone and the patient’s overall health.
Are Kidney Stones Hereditary?
Family history can increase the risk of kidney stones, but genetics is only one part of the picture. Hydration, diet, medical conditions, medications, body weight, urine chemistry, and lifestyle factors may also contribute.
Patients with a strong family history or repeated stones may benefit from a more detailed evaluation. Understanding the pattern can help the care team recommend prevention strategies that are more specific than general advice.
Myth: Drinking Less Water Prevents Kidney Stones
This is false. For many people, not drinking enough fluid can increase the risk of kidney stones because urine becomes more concentrated. Concentrated urine allows minerals and salts to crystallize more easily.
For many stone formers, clinicians may recommend enough fluid intake to produce at least 2.5 liters of urine per day, when safe for the patient.
However, fluid advice is not the same for everyone. Patients with kidney failure, heart failure, fluid restrictions, or certain medical conditions should ask their care team how much fluid is safe.
Myth: Avoiding Calcium Prevents Kidney Stones
This is one of the most common misconceptions. Although many kidney stones contain calcium, avoiding calcium in the diet is not usually recommended unless a physician gives specific instructions.
For many patients, getting the right amount of calcium from food can actually help reduce the risk of calcium oxalate stones. When calcium binds with oxalate in the digestive tract, it forms a complex that the body cannot absorb. This prevents the oxalate from entering the bloodstream and reaching the kidneys, which may reduce the amount of oxalate excreted in the urine.
Patients should not start or stop calcium supplements without medical guidance, especially if they have a history of kidney stones.
Myth: Only Older Adults Get Kidney Stones
Kidney stones can occur at many ages. While risk may change over time, stones are not limited to older adults. Younger adults can develop stones, and some patients may have risk factors related to family history, diet, hydration, body weight, medical conditions, or medications.
Because kidney stones can affect different age groups, symptoms should not be ignored simply because a person is young or otherwise healthy.
Myth: All Kidney Stones Cause Severe Pain
Many kidney stones cause intense pain, especially when they move into the ureter and block urine flow. However, not all stones cause severe symptoms.
Some stones may cause mild discomfort, urinary symptoms, blood in the urine, or no symptoms at all. This is why imaging, urine testing, and follow-up may be important when a stone is suspected or found incidentally.
Myth: Medications Always Dissolve Kidney Stones
Medications do not dissolve every type of kidney stone. Their role depends on the stone’s composition and the patient’s urine chemistry.
Some medications may help prevent stones from returning. Others may help manage specific stone types, such as uric acid stones, or correct urine abnormalities such as low citrate. A physician can determine whether medication is appropriate based on testing and clinical history.
Myth: Home Remedies Can Safely Dissolve Any Kidney Stone
This is false. Home remedies, supplements, lemon juice, apple cider vinegar, or other “natural” approaches should not replace medical evaluation.
Some diet and hydration changes may help reduce the risk of future stones for certain patients, but they do not safely treat every stone. A stone that causes severe pain, fever, chills, vomiting, blood in the urine, or difficulty urinating needs timely medical evaluation.
Patients should also be cautious with supplements. High-dose vitamin C, for example, may increase oxalate levels in some patients because the body can convert vitamin C into oxalate.
How Can Patients Take an Active Role in Kidney Stone Care?
Patients can support their care by asking questions and keeping track of symptoms, medications, diet changes, supplements, fluid intake, and prior stone episodes.
Helpful questions include:
- What type of kidney stone do I have?
- Should the stone be analyzed?
- Do I need a 24-hour urine collection?
- How much fluid is safe for me?
- Should I aim for a specific urine volume?
- Should I change sodium, calcium, oxalate, potassium, or animal protein intake?
- Should I avoid or adjust any supplements, such as high-dose vitamin C?
- Do I need medication to prevent future stones?
- When should I seek urgent care?
Active participation helps patients understand their risk and make safer decisions with guidance from their care team.
Why Follow-Up Matters
Kidney stones often recur, especially without a prevention plan. Follow-up visits allow the care team to review symptoms, imaging, lab results, urine studies, medications, supplements, and prevention strategies.
Regular communication is especially important for patients with recurrent stones, chronic kidney disease, a single kidney, repeated infections, or a family history of stones.
The goal is not only to treat the current stone, but also to reduce the risk of future stones whenever possible.
Related Kidney Stone Resources
For more information, patients may also find these related Florida Kidney Physicians resources helpful:
- Diagnosing kidney stones with precision
- Treatment options for kidney stones
- Proactive prevention strategies for kidney stones
- Living with kidney stones
Conclusion
Kidney stones are common, but they are not all the same. The cause, symptoms, diagnosis, treatment, and prevention plan can vary from one patient to another.
Accurate information can help patients avoid harmful myths, recognize symptoms earlier, and work with their care team on a safer prevention strategy. At Florida Kidney Physicians, we encourage patients to ask questions, attend follow-up visits, and seek medical guidance before making major changes to fluids, diet, supplements, or medications.
FAQs
What is the most common symptom of kidney stones?
While symptoms vary, the most common sign of a kidney stone is sudden, severe pain that typically radiates through the back, side, lower abdomen, or groin, often occurring in waves.
How are kidney stones diagnosed?
Kidney stones may be diagnosed with urine testing, blood tests, imaging, and stone analysis when a stone is passed or removed. Some patients may also need a 24-hour urine collection to guide prevention.
When is a kidney stone an emergency?
A kidney stone may be an emergency if symptoms include fever, chills, vomiting, severe pain, inability to urinate, or symptoms in a patient with one kidney, pregnancy, chronic kidney disease, or a history of complicated stones.
Can drinking water help prevent kidney stones?
For many people, drinking enough water helps dilute the urine and may reduce the risk of stone formation. Some stone formers may be advised to produce at least 2.5 liters of urine per day, when safe. Patients with kidney disease, heart failure, or fluid restrictions should ask their physician how much fluid is safe.
Should I avoid calcium if I have kidney stones?
Not usually. Many patients with kidney stones should still get the right amount of calcium from food. Avoiding calcium without medical guidance may not prevent stones and can affect bone health.
Can vitamin C supplements increase kidney stone risk?
High-dose vitamin C supplements may increase oxalate levels in some patients because the body can convert vitamin C into oxalate. Patients with a history of kidney stones should review supplements with their healthcare professional.
Do all kidney stones need surgery?
No. Some small stones may pass on their own with medical supervision. Larger stones, stones that block urine flow, stones linked to infection, or stones causing severe symptoms may require a procedure.
Can kidney stones come back?
Yes. Kidney stones can recur. A prevention plan based on stone type, urine testing, diet, hydration, medical history, and follow-up care may help reduce the risk of future stones.