Kidney Stones: Symptoms, Causes, and How They Are Diagnosed

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, urinary symptoms, and sometimes infection, but effective diagnosis and treatment are available.

Overview

Kidney stones are hard deposits that form when substances in the urine, such as calcium, oxalate, or uric acid, become concentrated and crystallize. These crystals can grow into stones inside the kidneys and may stay there or move into the ureter, the tube that carries urine from the kidney to the bladder.

Some kidney stones are very small and pass without being noticed. Others can become large enough to block urine flow and cause significant pain. The symptoms and urgency of treatment often depend on the stone’s size, its location, and whether it is causing obstruction or infection.

Several types of kidney stones exist, including calcium stones, uric acid stones, struvite stones, and cystine stones. Knowing the stone type is important because it helps guide prevention strategies and may influence treatment choices after the immediate problem has been managed.

Symptoms of Kidney Stones

The classic symptom of kidney stones is sudden, intense pain that may begin in the side or back below the ribs and move toward the lower abdomen or groin. This pain often comes in waves and may change in intensity as the stone moves through the urinary tract. Many people describe it as one of the more severe kinds of pain they have experienced.

Other common symptoms include pain or burning during urination, frequent urination, a feeling of urgency, nausea, and vomiting. Blood in the urine may make the urine look pink, red, or brown. Sometimes the urine may appear cloudy or have an unpleasant odor, especially if infection is also present.

Not all kidney stones cause obvious symptoms. Small stones that remain in the kidney may be silent and found only during imaging done for another reason. However, if a stone blocks urine flow or irritates the urinary tract, symptoms usually develop.

• Sharp pain in the side, back, lower abdomen, or groin
• Blood in the urine
• Painful urination
• Nausea and vomiting
• Frequent or urgent urination
• Cloudy or foul-smelling urine

Causes and Risk Factors

Kidney stones form when the urine contains more crystal-forming substances than the fluid can dilute. At the same time, the urine may lack enough substances that normally prevent crystals from sticking together. This combination makes stone formation more likely.

Dehydration is one of the most important risk factors. When a person does not drink enough fluids or loses too much fluid through sweating, vomiting, or diarrhea, the urine becomes more concentrated. Diet can also play a role. Depending on the stone type, a high intake of salt, animal protein, or foods rich in oxalate may increase risk in some people.

Other risk factors include a personal or family history of stones, obesity, recurrent urinary tract infections, and certain digestive or metabolic conditions. Some medications and supplements may also contribute to stone formation in susceptible individuals. People with disorders that affect calcium, uric acid, or cystine handling may be especially prone to repeated stones.

Sometimes kidney stones are linked to an underlying health issue such as gout, hyperparathyroidism, inflammatory bowel disease, or a structural problem in the urinary tract. When stones recur, doctors often look more closely for these contributing factors to help prevent future episodes.

How Kidney Stones Are Diagnosed

Diagnosis usually begins with a medical history and physical examination. A doctor asks about the pattern of pain, urinary symptoms, past stone episodes, family history, diet, and fluid intake. If a stone is suspected, tests help confirm the diagnosis, find the stone’s location, and check for complications such as infection or reduced kidney function.

Urine tests may show blood, crystals, or signs of infection. Blood tests can help assess kidney function and measure levels of substances linked to stone formation, such as calcium or uric acid. If a stone has already passed, analyzing it can provide valuable information about its composition.

Imaging is often central to diagnosis. Ultrasound is commonly used because it is safe and does not use radiation. In many cases, especially when the diagnosis is uncertain or a detailed view is needed, a CT scan can identify stones very accurately. X-rays may be useful in selected situations, particularly for follow-up of certain stone types.

For people with recurrent stones, doctors may recommend a 24-hour urine collection after the acute episode has settled. This test measures urine volume and the amount of minerals and compounds involved in stone formation. It can help create a more personalized prevention plan.

Treatment Options

Treatment depends on the size and type of the stone, where it is located, how much pain it is causing, and whether there is infection or blockage. Many small stones pass on their own with time, fluids, and symptom relief. Doctors may recommend pain control and monitoring while the stone moves through the urinary tract.

If a stone is too large to pass, causes severe symptoms, blocks urine flow, or is associated with infection, a procedure may be needed. Common options include shock wave treatment to break the stone into smaller pieces, endoscopic procedures through the urinary tract, or in selected cases surgery. Someone with fever, chills, and an obstructing stone may need urgent treatment to drain the urinary system.

After the immediate episode, prevention becomes an important part of care. This may include increasing fluid intake, making dietary changes, and treating underlying metabolic issues. Some people also benefit from medicines that reduce the risk of certain stone types. A tailored plan is especially helpful for recurrent stones or stones linked to medical conditions.

In more complex or repeated cases, a urologist may discuss options such as kidney stone treatment, including ureteroscopy or percutaneous nephrolithotomy when these are appropriate. The most suitable approach is based on imaging findings, symptoms, and overall health.

Prevention and Self-care

For many people, the most effective prevention step is to drink enough fluids to produce adequately diluted urine. Water is usually the best choice. A doctor may suggest a daily fluid goal based on climate, activity level, and the person’s medical history. People who have had stones before often need to be especially mindful of hydration.

Dietary advice depends on the type of stone, so broad restrictions are not always helpful. In general, reducing excess salt and avoiding dehydration can be beneficial. Some people may be advised to moderate animal protein or oxalate-rich foods, while still maintaining a balanced diet. It is important not to stop calcium intake without medical advice, because normal dietary calcium can actually help lower the risk of some stones.

Self-care during a stone episode may include drinking fluids if tolerated, using prescribed pain relief, and straining the urine to catch the stone for analysis. Resting and monitoring symptoms can also help. However, self-care should not replace medical evaluation if pain is severe, symptoms persist, or warning signs are present.

People with repeated stones may need a longer-term plan that includes follow-up testing and management of related conditions such as urinary tract infection or hydronephrosis if these develop as complications. Near the end of the care pathway, centers such as Acibadem International can support international patients through multidisciplinary evaluation and treatment in JCI-accredited hospitals.

When to See a Doctor

A person should seek medical attention if they have severe pain in the side or back, visible blood in the urine, persistent vomiting, or difficulty passing urine. These symptoms may suggest a stone that needs medical assessment. Even if the pain improves, follow-up can still be important to confirm that the stone has passed and that the kidney is not blocked.

Urgent care is especially important if kidney stone symptoms occur with fever, chills, confusion, or marked weakness. These may be signs of infection in a blocked urinary tract, which can become serious without prompt treatment. Reduced urine output or pain in someone with a single kidney also needs urgent evaluation.

Anyone with repeated stone episodes, a family history of stones, or an underlying condition that raises the risk of stone formation should discuss prevention with a doctor. A personalized evaluation can reduce the likelihood of future episodes and help protect long-term kidney health.

Frequently asked questions

Can kidney stones go away on their own?

Yes, many small kidney stones can pass naturally through the urinary tract without a procedure. Whether this is likely depends on the stone’s size, location, and the person’s symptoms. A doctor can advise whether watchful waiting is reasonable and safe.

What does kidney stone pain feel like?

Kidney stone pain often starts suddenly and may be felt in the side, back, lower abdomen, or groin. It is commonly described as sharp, severe, and wave-like, with intensity that can change as the stone moves. Some people also have nausea or pain during urination.

Are kidney stones caused by drinking too little water?

Dehydration is one of the most common contributors to kidney stones because it makes urine more concentrated. However, stones usually develop from a combination of factors, including diet, genetics, medical conditions, and sometimes medications. Drinking enough water is an important preventive step, but it is not the only factor.

How are kidney stones diagnosed?

Doctors diagnose kidney stones using a combination of medical history, examination, urine and blood tests, and imaging. Ultrasound and CT scans are commonly used to locate the stone and assess whether it is blocking urine flow. If the stone passes, laboratory analysis can help identify its type.

Do all kidney stones need surgery?

No, many kidney stones do not require surgery and can be managed with fluids, pain relief, and observation. Procedures are more likely to be needed when a stone is large, causes severe pain, leads to blockage, or is linked to infection. The treatment plan is individualized.

Can kidney stones come back?

Yes, kidney stones can recur, especially if the underlying cause is not addressed. Preventive steps may include better hydration, dietary changes, and tests to look for metabolic risk factors. A doctor can recommend a plan based on the type of stone and the person’s history.

References

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

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.