Kidney Stones: Causes, Symptoms, and Treatment Options Explained

Kidney stones are hard deposits made of minerals and salts that form in the kidneys and may travel through the urinary tract. They can cause sudden pain and urinary symptoms, but diagnosis and treatment are often straightforward, especially when care is sought early.

Overview

Kidney stones are solid, pebble-like deposits that develop when certain substances in the urine become concentrated and form crystals. Over time, these crystals can join together and grow into stones. They may remain in the kidney or move into the ureter, the tube that carries urine from the kidney to the bladder.

Stones vary in size, number, and composition. Some are as small as grains of sand and pass without being noticed, while others become larger and block the flow of urine. This blockage is often what causes the classic severe pain associated with kidney stones.

Several types of kidney stones exist, including calcium stones, uric acid stones, struvite stones, and cystine stones. Knowing the type matters because it can help guide prevention and lower the chance of future episodes. In some people, kidney stones happen only once, while in others they may recur over time.

Symptoms of Kidney Stones

Kidney stones do not always cause symptoms right away. A stone may remain silent while it stays in the kidney. Symptoms usually begin when the stone moves or causes blockage in the urinary tract.

The most common symptom is sudden, intense pain in the side, back, or lower abdomen. This pain may come in waves and change location as the stone moves. Some people also feel pain during urination, urgency to urinate more often, or the feeling that the bladder is not emptying fully.

Other possible symptoms include blood in the urine, cloudy or foul-smelling urine, nausea, and vomiting. If infection develops along with the blockage, fever and chills may occur. These symptoms need prompt medical attention because they can signal a more serious problem.

• Sharp pain in the back, side, groin, or lower abdomen
• Blood in the urine
• Nausea and vomiting
• Burning or pain with urination
• Frequent urination or urgent need to urinate
• Fever and chills if infection is present

Causes and Risk Factors

Kidney stones form when urine contains more crystal-forming substances than it can dilute. These substances may include calcium, oxalate, uric acid, or cystine. At the same time, urine may lack enough fluids or protective compounds that normally help prevent crystals from sticking together.

Dehydration is one of the most common risk factors. Not drinking enough water makes urine more concentrated and increases the chance of stone formation. Diet can also play a role. High salt intake, large amounts of animal protein, and certain foods rich in oxalate may contribute in some people, depending on the stone type.

Other risk factors include a family history of stones, obesity, digestive disorders, recurrent urinary tract infections, and certain medical conditions that affect calcium or uric acid balance. Some medications and supplements may also increase risk. In people with repeat stones, doctors may investigate whether an underlying metabolic or structural issue is involved, including related kidney conditions or persistent urinary tract infections when symptoms overlap.

How Kidney Stones Are Diagnosed

Doctors diagnose kidney stones by combining the person’s symptoms, medical history, physical examination, and imaging tests. The pattern of pain and urinary symptoms often raises suspicion, but imaging is usually needed to confirm the diagnosis and show the size and location of the stone.

Common tests include urine analysis to look for blood, crystals, or signs of infection, and blood tests to assess kidney function and check levels of certain minerals. Imaging studies may include ultrasound or computed tomography. These tests help determine whether the stone is causing obstruction and whether urgent treatment is needed.

If a stone passes, it may be collected and analyzed to identify its chemical makeup. For people with recurrent stones, doctors may recommend additional testing, such as a 24-hour urine collection, to better understand why stones are forming. This information can support a more personalized prevention plan.

Treatment Options

Treatment depends on the size, location, and type of stone, as well as the severity of symptoms and whether there is infection or blockage. Small stones often pass on their own with time, hydration, pain relief, and medical guidance. Doctors may also prescribe medicines that relax the ureter and make passage easier in selected cases.

Larger stones, ongoing pain, repeated vomiting, infection, or reduced kidney function may require procedural treatment. One common option is shock wave lithotripsy, which uses focused sound waves to break the stone into smaller fragments. Another option is ureteroscopy, in which a thin instrument is passed through the urinary tract to locate and remove or break the stone.

Very large or complex stones may need percutaneous nephrolithotomy, a procedure performed through a small incision in the back to remove stone material directly. If a stone is causing severe blockage, a temporary stent or drainage tube may be needed to protect kidney function. Treatment plans are tailored to the individual, and the goal is both to relieve symptoms and to help prevent recurrence.

Prevention and Self-care

Prevention is an important part of kidney stone care, especially for people who have had more than one stone. Drinking enough fluids is one of the most effective steps. In general, the aim is to produce urine that stays pale in color throughout most of the day, although exact fluid needs vary from person to person.

Dietary changes may also help, depending on the stone type. Reducing excess salt, avoiding dehydration, and moderating animal protein can be useful for many people. It is usually better not to make major restrictions without medical advice, because recommendations differ for calcium, uric acid, and other stone types. For example, some people need to limit specific foods, while others may benefit from maintaining normal dietary calcium rather than cutting it too low.

Doctors may recommend medications to reduce recurrence in people at higher risk. Regular follow-up can be helpful to monitor kidney health and adjust prevention strategies over time. Near the end of the care journey, some patients also benefit from specialist review in centers that treat complex kidney stones and related urinary tract problems. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat kidney stones for international patients.

When to See a Doctor

Anyone with symptoms that may suggest a kidney stone should seek medical advice, especially if the pain is severe or persistent. Prompt assessment helps confirm the diagnosis, control discomfort, and detect complications such as blockage or infection.

Urgent care is especially important if symptoms occur together with fever, chills, repeated vomiting, very little urine output, or inability to pass urine. These signs may point to an obstructed or infected urinary system, which needs fast treatment.

People with a single kidney, known kidney disease, pregnancy, or repeated stone episodes should also contact a doctor early. Timely treatment can protect kidney function and reduce the risk of future problems.

Frequently asked questions

Can kidney stones go away on their own?

Yes, many small kidney stones can pass on their own, especially if they are not causing major blockage. A doctor may recommend fluids, pain relief, and monitoring, but medical review is still important to make sure there is no infection or damage to the kidney.

What does kidney stone pain feel like?

Kidney stone pain is often described as sudden, sharp, and severe. It commonly starts in the side or back and may move toward the lower abdomen or groin as the stone travels through the urinary tract.

Do all kidney stones need surgery?

No, not all kidney stones need surgery or a procedure. Small stones may pass naturally, while larger stones or stones causing persistent symptoms, infection, or blockage may need treatments such as lithotripsy or ureteroscopy.

How are kidney stones prevented?

Prevention often begins with drinking enough fluids and making targeted diet changes based on the type of stone. Some people also need medications or further evaluation if stones happen repeatedly.

Are kidney stones a sign of kidney disease?

Not always. Many people with kidney stones do not have chronic kidney disease, but repeated stones or untreated obstruction can affect kidney health over time. That is why proper evaluation and follow-up matter.

When is a kidney stone an emergency?

A kidney stone can become an emergency if it causes fever, chills, severe vomiting, inability to urinate, or uncontrolled pain. These symptoms may suggest infection or significant blockage and should be assessed urgently.

References

• National Institute of Diabetes and Digestive and Kidney Diseases
• American Urological Association
• European Association of Urology
• 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.