Kidney Stones: Causes, Risk Factors, and Prevention Tips

Kidney stones are hard deposits made of minerals and salts that form in the kidneys or urinary tract. They are common and often very painful, but many can be treated effectively and some can be prevented with the right lifestyle and medical guidance.

Overview

Kidney stones are solid crystals that develop when substances normally dissolved in urine, such as calcium, oxalate, and uric acid, become too concentrated. These crystals can form in the kidneys and may stay there or move into the ureters, the tubes that carry urine from the kidneys to the bladder. Small stones may pass on their own, while larger stones can block urine flow and cause significant discomfort.

Although kidney stones can affect anyone, they are more common in adults and in people with a personal or family history of stones. Several different types exist, including calcium stones, uric acid stones, struvite stones, and cystine stones. Knowing the type of stone is important because it can help guide treatment and prevention.

Kidney stones are usually treatable, and many people recover fully once the stone passes or is removed. However, stones can return, especially if the underlying cause is not addressed. That is why medical evaluation, hydration, and prevention planning are important parts of care.

Symptoms

A kidney stone may not cause symptoms until it begins to move within the kidney or enters the ureter. When that happens, pain often starts suddenly and may be severe. It is commonly felt in the side, back, lower abdomen, or groin, and it may come in waves as the muscles of the urinary tract try to push the stone forward.

Other symptoms can include pain or burning with urination, an urgent need to urinate, frequent urination, or passing only small amounts of urine. Blood in the urine is also common and may make the urine look pink, red, or brown. Some people notice cloudy or foul-smelling urine.

Nausea and vomiting can happen because pain from the urinary tract can trigger a whole-body response. If a stone causes infection or significant blockage, a person may also develop fever or chills. These symptoms need prompt medical attention because they can signal a more serious problem.

• Severe pain in the back, side, lower abdomen, or groin
• Blood in the urine
• Painful or frequent urination
• Nausea and vomiting
• Cloudy urine or urine with a strong odor
• Fever and chills if infection is present

Causes and Risk Factors

Kidney stones do not always have one single cause. In many cases, they form when urine contains more crystal-forming substances than the fluid can dilute. If there is not enough water in the urine, or if the balance of minerals and protective substances is disrupted, crystals can stick together and gradually grow into stones.

Dehydration is one of the most common risk factors. Not drinking enough fluids, heavy sweating, hot climates, and frequent exercise without replacing lost water can all make urine more concentrated. Diet may also play a role. Depending on the type of stone, a high intake of salt, animal protein, or oxalate-rich foods may contribute.

Some people are more likely to develop stones because of their medical history. Risk can be higher in those with obesity, recurrent urinary tract infections, gout, digestive diseases, bowel surgery, hyperparathyroidism, or inherited disorders that affect how the body handles minerals. Certain medications and supplements may also increase stone risk in some individuals.

A previous kidney stone is one of the strongest predictors of another one in the future. For this reason, doctors may recommend a more detailed evaluation after a first stone, especially if it occurs at a young age, returns often, or is associated with an underlying condition such as a kidney condition that also needs urologic assessment.

Diagnosis

Diagnosis usually begins with a medical history, symptom review, and physical examination. A doctor may ask about the location and pattern of pain, fluid intake, diet, past stones, family history, and any medicines or supplements being used. This information helps estimate the likelihood of a stone and whether other causes of pain should be considered.

Urine tests can check for blood, infection, crystals, and signs of dehydration. Blood tests may evaluate kidney function and levels of substances linked to stone formation, such as calcium or uric acid. If a stone is passed, analyzing its composition can be very useful in planning prevention.

Imaging tests often confirm the diagnosis and show the stone’s size and location. Ultrasound is commonly used, especially in children and during pregnancy, because it avoids radiation. CT scanning may be recommended when more detail is needed or when symptoms are severe. In people with repeated stones, doctors may also order a 24-hour urine collection to look for chemical imbalances that increase risk.

Treatment Options

Treatment depends on the stone’s size, location, type, and whether it is causing obstruction, ongoing pain, or infection. Many small stones can pass naturally with time, fluids, and pain relief. Doctors may also prescribe medication to help relax the ureter and support stone passage in selected cases.

If a stone is too large to pass, is stuck, or is causing complications, a procedure may be needed. Common options include shock wave treatment to break the stone into smaller pieces, endoscopic removal through the urinary tract, or in some situations surgery. The right approach is based on the stone and the person’s overall health.

When infection and blockage happen together, treatment is urgent because pressure can build in the kidney and bacteria can spread. In these cases, doctors may first drain the urine and treat the infection before removing the stone. People with repeated stones may also benefit from long-term management aimed at the underlying cause.

Depending on the situation, treatment may include ureteroscopy, shock wave lithotripsy, or percutaneous nephrolithotomy for larger or more complex stones. Supportive care may also involve follow-up with specialists in urology to reduce the risk of recurrence.

Prevention and Self-care

Prevention starts with staying well hydrated. For many people, drinking enough water throughout the day is the most effective way to reduce stone risk because it keeps urine diluted. The exact amount varies with age, climate, health status, and activity level, so a doctor may give personalized guidance, especially for people who have had stones before.

Dietary changes may also help, but they should be tailored to the type of stone. In general, reducing excess salt is often recommended because high sodium can increase calcium in the urine. Some people may need to moderate animal protein or limit high-oxalate foods. However, avoiding all calcium is usually not advised, since normal dietary calcium can actually help protect against some stones.

Maintaining a healthy weight and managing related conditions such as gout, digestive disorders, or recurrent urinary infections can also be important. If tests show a specific metabolic reason for stones, a doctor may prescribe medication to change urine chemistry and lower the chance of future stone formation.

Self-care is helpful, but prevention is not one-size-fits-all. A person who has already had a kidney stone should speak with a qualified doctor about a prevention plan based on stone analysis, urine testing, and overall health.

When to See a Doctor

Anyone with intense side or back pain, blood in the urine, or pain that does not improve should seek medical evaluation. It can be difficult to tell the difference between kidney stone pain and other urgent conditions, so persistent or severe symptoms should not be ignored.

Urgent care is especially important if symptoms are accompanied by fever, chills, vomiting, inability to urinate, or signs of dehydration. These may suggest infection, significant blockage, or another serious problem that needs prompt treatment. People with only one kidney, pregnancy, chronic kidney disease, or weakened immunity should also contact a doctor quickly if stone symptoms occur.

Even after the immediate problem has been treated, follow-up matters. Recurrent stones can often be reduced with proper evaluation and prevention. For international patients who need specialized assessment and treatment, Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals provide diagnosis and care for kidney stone disease.

Frequently asked questions

Can kidney stones go away on their own?

Yes, many small kidney stones can pass naturally through the urinary tract. Whether this happens depends on the stone’s size, location, and the person’s symptoms. A doctor can help determine if watchful waiting is safe or if treatment is needed.

What does kidney stone pain feel like?

Kidney stone pain is often described as sudden, severe, and cramping. It commonly starts in the side or back and may move toward the lower abdomen or groin. The pain may come in waves rather than staying constant.

Does drinking water really help prevent kidney stones?

For many people, yes. Drinking enough water helps dilute the urine, making it harder for minerals and salts to form crystals. Hydration is one of the most widely recommended prevention steps, though some people also need diet changes or medication.

Are all kidney stones made of calcium?

No. Calcium stones are the most common, but kidney stones can also be made of uric acid, cystine, or materials linked to infection such as struvite. Identifying the stone type helps guide prevention and treatment.

When is a kidney stone considered an emergency?

A kidney stone may require urgent care if it causes fever, chills, vomiting, severe uncontrolled pain, or inability to pass urine. These symptoms can suggest infection or blockage. Prompt treatment is important to protect kidney health and overall well-being.

Can kidney stones come back after treatment?

Yes, recurrence is common in some people. The risk is higher if the underlying cause is not identified and addressed. Follow-up care, hydration, and personalized prevention strategies can help lower the chance of future stones.

References

• National Institute of Diabetes and Digestive and Kidney Diseases
• American Urological Association
• European Association of Urology
• Mayo Clinic
• National Kidney Foundation

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.