What Causes Kidney Stones?

Kidney stones develop when minerals, salts, and other substances in urine become overly concentrated and begin to crystallize inside the kidneys. Under normal conditions, urine contains enough fluid to dilute these substances and flush them out of the body. However, when this balance is disrupted, crystals can stick together, grow in size, and eventually harden into stones. These stones may remain in the kidneys or travel through the urinary tract, often causing significant pain and discomfort.

Kidney stones – Symptoms and causes

Kidney stones are caused by dehydration, mineral imbalances, diet, medical conditions, and genetic factors. With early diagnosis and the right specialist care, kidney stones are highly treatable and often preventable. If you’re experiencing symptoms or have a history of stones, seeing a urologist in Queens at Medex Diagnostic and Treatment Center can help identify the cause and create a personalized treatment and prevention plan.

Kidney stones can affect people of all ages and may occur once or repeatedly, depending on lifestyle factors, underlying health conditions, and genetic predisposition. Understanding the causes of kidney stones is essential for both treatment and long-term prevention.

Dehydration and Low Fluid Intake

Dehydration is the most common cause of kidney stones. When you do not drink enough water, urine becomes more concentrated, increasing the likelihood that minerals such as calcium, oxalate, and uric acid will crystallize. People who live in hot climates, exercise intensely, or sweat frequently are at higher risk if fluid intake does not match fluid loss. Consistently drinking enough water throughout the day is one of the most effective ways to reduce kidney stone formation.

High Levels of Stone-Forming Minerals

Excess minerals in the urine are a major contributor to kidney stone development. Calcium stones, the most common type, form when calcium binds with oxalate or phosphate. Uric acid stones occur when urine becomes too acidic, often due to high purine intake or metabolic disorders. These imbalances can result from diet, supplements, or medical conditions that affect how the body processes minerals.

Diet High in Salt, Protein, and Sugar

Diet plays a significant role in kidney stone risk. High sodium intake causes the kidneys to excrete more calcium into the urine, increasing the chance of stone formation. Diets rich in animal protein, such as red meat, poultry, and seafood, can raise uric acid levels and reduce urine citrate, a substance that normally helps prevent stones. Excess sugar, particularly fructose, may also interfere with calcium metabolism and promote stone development.

Underlying Medical Conditions

Certain medical conditions significantly increase the likelihood of kidney stones. Gout raises uric acid levels, while inflammatory bowel disease and chronic diarrhea can lead to dehydration and altered mineral absorption. Recurrent urinary tract infections may cause struvite stones, which can grow quickly and become large. Hormonal disorders such as hyperparathyroidism can increase calcium levels in the blood and urine, directly contributing to stone formation.

Genetics and Family History

A family history of kidney stones increases your risk of developing them. Genetic factors can influence how your body processes calcium, oxalate, and other stone-forming substances. Some rare inherited disorders, such as cystinuria, cause recurrent kidney stones due to abnormal amino acid handling by the kidneys.

Obesity and Metabolic Factors

Obesity and metabolic syndrome are closely linked to kidney stone development. Excess body weight alters urine chemistry by increasing acid levels and decreasing protective compounds like citrate. Insulin resistance may also affect kidney function and mineral balance, making stones more likely to form over time.

Medications and Supplements

Certain medications and supplements can increase kidney stone risk when used long term or at high doses. These include calcium supplements, high-dose vitamin C, diuretics, some antacids, and specific antiviral or chemotherapy drugs. Always consult a healthcare provider before starting supplements, especially if you have a history of kidney stones.

Types of Kidney Stones

There are several types of kidney stones, each with different causes and treatments:

• Calcium stones – the most common type, often linked to diet and dehydration
• Uric acid stones – associated with high protein intake and acidic urine
• Struvite stones – caused by chronic urinary tract infections
• Cystine stones – rare stones caused by inherited genetic disorders

Identifying the stone type is critical for preventing recurrence.

What Doctor Should You See for Kidney Stones?

If you suspect kidney stones or experience symptoms such as severe flank pain, blood in the urine, nausea, or difficulty urinating, medical evaluation is essential.

At Medex Diagnostic and Treatment Center, patients are evaluated by the appropriate specialists for fast and accurate diagnosis.

Urologist – Primary Kidney Stone Specialist

A urologist specializes in diagnosing and treating kidney stones. They manage acute pain, order imaging tests such as ultrasounds or CT scans, determine stone type, and perform procedures if stones do not pass naturally. Urologists also focus on preventing future stones through medical therapy and lifestyle guidance.

Nephrologist – For Recurrent or Complex Cases

A nephrologist may be involved when kidney stones are recurrent, linked to metabolic disorders, or affecting kidney function. They focus on long-term kidney health and underlying causes such as electrolyte imbalances or chronic disease.

When to Seek Immediate Medical Care

You should seek urgent medical attention if you experience:

• Intense back or abdominal pain that does not improve
• Blood in the urine
• Fever or chills (possible infection)
• Persistent nausea or vomiting
• Difficulty or inability to urinate

Prompt treatment helps prevent complications such as infection or kidney damage.

Kidney stones are caused by dehydration, mineral imbalances, diet, medical conditions, and genetic factors. With early diagnosis and the right specialist care, kidney stones are highly treatable and often preventable. If you’re experiencing symptoms or have a history of stones, seeing a urologist at Medex Diagnostic and Treatment Center in Queens can help identify the cause and create a personalized treatment and prevention plan.