Kidney stones are more common than most people realise. In India, around 12% of the population is affected by urinary stones at some point in their lives, and approximately two million new cases are diagnosed every year. Globally, kidney stone disease is one of the three most common urological conditions after infections and prostate disease, and its prevalence has been rising steadily across all age groups and both sexes.
The challenging part is that early signs of kidney stones can be easy to miss or confuse with other conditions. A dull ache in the back, a sudden need to urinate, or a slight change in urine colour might not immediately suggest a kidney stone. But catching these signs early makes a real difference. Small stones that are identified before they grow or cause a blockage are far easier to treat.
This guide explains what the early warning signs look like, what causes kidney stones, who is at higher risk, and when it is time to see a urologist.
Early Signs of Kidney Stones: The Short Answer
The earliest signs of kidney stones include pain in the side or back that comes and goes in waves, pain or burning during urination, a frequent and urgent need to urinate, blood in the urine, and urine that looks cloudy or smells unusually strong. Nausea alongside back or flank pain is also a common early indicator. These symptoms often appear when a stone begins moving through the urinary tract.
What is a Kidney Stone?
A kidney stone is a hard deposit that forms inside the kidney when certain minerals and salts in the urine become too concentrated. Instead of being flushed out naturally, these minerals crystallise and clump together over time. Stones can range from the size of a grain of sand to several centimetres across.
Most kidney stones are made of calcium oxalate. Others are made of uric acid, struvite, or cystine, each with slightly different causes and risk factors. The type of stone matters for treatment and prevention planning.
Small stones often pass through the urinary tract on their own without causing significant symptoms. Larger stones can get stuck, causing pain and blocking the flow of urine, which requires medical treatment.
Warning Signs of Kidney Stones to Watch For
Pain in the Side, Back, or Below the Ribs
This is usually the first and most noticeable symptom. The pain from a kidney stone is often described as one of the most intense a person can experience. It typically starts suddenly, without warning, and can feel sharp, cramping, or wave-like.
The pain usually begins in the side or back, just below the ribs. As the stone moves down the ureter toward the bladder, the pain can shift to the lower abdomen or groin. It tends to come in waves, intensifying and then easing, which reflects the movement of the stone.
This type of pain is called renal colic. It does not improve with rest or position changes, which helps distinguish it from muscle pain.
Pain or Burning During Urination
When a stone moves into the lower part of the ureter, close to the bladder, urination becomes painful. You may feel a sharp burning sensation when passing urine. This is sometimes mistaken for a urinary tract infection, and the two conditions can sometimes occur together.
If burning during urination comes on suddenly alongside back or flank pain, a kidney stone should be considered.
Frequent or Urgent Need to Urinate
Needing to urinate more often than usual, or feeling a sudden strong urge to go, is a common early sign when a stone sits near the bladder. You may rush to the toilet but pass only a small amount of urine each time.
This symptom is easy to dismiss as a minor bladder issue, but when it occurs alongside any discomfort in the back or side, it deserves attention.
Blood in the Urine
Blood in the urine, called haematuria, is one of the most important early signs of kidney stones. The urine may appear pink, red, or brownish. In some cases the blood is only detectable through a urine test, not visible to the naked eye.
Blood in the urine occurs because the stone scrapes against the lining of the urinary tract as it moves. Even a single episode of blood in the urine should be evaluated by a doctor without delay, as it can indicate kidney stones, infection, or in some cases, other conditions that need ruling out.
Cloudy or Foul-Smelling Urine
Urine that looks cloudy or has a strong, unpleasant smell often points to an infection in the urinary tract. Kidney stones can cause or trigger infections by obstructing urine flow and allowing bacteria to accumulate.
If your urine looks or smells different from usual, especially alongside any back or abdominal discomfort, a urine test is a good first step.
Passing Urine in Small Amounts
If a stone is partially blocking the ureter or the entry to the bladder, you may feel a constant urge to urinate but only manage to pass a few drops at a time. This incomplete emptying can be uncomfortable and frustrating. It typically resolves once the stone moves or is treated.
Nausea and Vomiting
It may seem surprising, but kidney pain frequently causes nausea. This happens because the kidneys and the digestive system share nerve pathways. When kidney pain is intense, the body’s response can include nausea and sometimes vomiting.
If you experience nausea alongside flank or back pain, and there is no obvious digestive cause, a kidney stone is worth considering.
Fever and Chills
Fever and chills are not early signs of an uncomplicated kidney stone. If you develop these symptoms alongside back pain, painful urination, or blood in the urine, it suggests that an infection has developed, possibly a kidney infection (pyelonephritis).
This combination requires urgent medical attention. A kidney infection that is not treated promptly can become serious and affect kidney function.
Types of Kidney Stones
Understanding the type of stone matters for both treatment and prevention.
Calcium oxalate stones are the most common, making up around 75 to 80% of all kidney stones. They form when calcium combines with oxalate in the urine. A diet high in oxalate-rich foods such as spinach, nuts, tea, and chocolate, combined with low fluid intake, increases the risk.
Uric acid stones form when urine is persistently acidic. They are more common in people with gout, diabetes, or those who eat a high-protein diet. Unlike calcium stones, uric acid stones sometimes respond to medical treatment to dissolve them.
Struvite stones are linked to recurrent urinary tract infections. They can grow quickly and become quite large. They are more common in women.
Cystine stones are rare and caused by a genetic condition called cystinuria, which causes the kidneys to excrete too much of a particular amino acid.
What Causes Kidney Stones?
Kidney stones form when the urine contains more crystal-forming substances than the fluid can dilute. Several factors contribute to this imbalance.
Low fluid intake is the single most common contributing factor. When you do not drink enough water, urine becomes concentrated and minerals are more likely to crystallise. This is particularly relevant in a warm climate like Bengaluru, where dehydration can happen more easily.
Diet plays a significant role. High intake of salt raises calcium levels in the urine. A diet high in animal protein increases uric acid. Excessive consumption of oxalate-rich foods combined with low calcium intake can also increase risk.
Obesity changes the way the body processes minerals and increases the likelihood of stone-forming conditions.
Family history is a meaningful risk factor. If a parent or sibling has had kidney stones, your risk is higher than average.
Certain medical conditions increase susceptibility, including hyperparathyroidism, gout, inflammatory bowel disease, and recurrent urinary tract infections.
Some medications can increase stone risk as a side effect, including certain diuretics, calcium-based antacids, and some medications used for HIV treatment. Always inform your doctor about all medications you take if you have a history of kidney stones.
Who is at Higher Risk?
Research shows that the risk of kidney stones varies significantly by region, ranging from 1 to 5% in parts of Asia to 10 to 15% in North America and as high as 20 to 25% in parts of the Middle East. In India, around 12% of the population is prone to urinary stones, with dehydration from the country’s hot climate identified as a major contributing factor.
Men are more commonly affected than women, though recent data shows the gap between men and women has been narrowing, with stone rates among women rising notably over the past two decades.
People most at risk include those who:
- Do not drink enough water daily
- Have a family history of kidney stones
- Eat a diet high in salt, protein, or oxalate-rich foods
- Are overweight or obese
- Have diabetes, gout, or inflammatory bowel disease
- Have had a kidney stone before. Recurrence rates are significant, with studies from India showing a recurrence risk of 60 to 90% without preventive measures
- Live or work in hot environments where dehydration is more likely
How are Kidney Stones Diagnosed?
If your doctor suspects a kidney stone, the evaluation usually includes:
- Urine test: Checks for blood, infection, and crystal-forming minerals in the urine.
- Blood test: Measures kidney function and levels of calcium, uric acid, and other relevant markers.
- Imaging: A CT scan of the abdomen and pelvis is the most accurate way to confirm the presence, size, and location of a kidney stone. Ultrasound is also used, particularly as a first-line test, and is safe for pregnant women and children.
- Stone analysis: If a stone is passed and collected, it can be analysed to determine its exact composition, which guides prevention advice.
Treatment Options for Kidney Stones
Treatment depends on the size and location of the stone and the severity of symptoms.
Watchful waiting with increased hydration is appropriate for small stones under 5 mm. Most of these pass on their own within a few weeks. Pain relief medication is prescribed to manage discomfort during this time.
Medical expulsion therapy using alpha-blocker medications can help relax the ureter and speed up the passage of small to medium stones.
Ureteroscopy with laser lithotripsy is a minimally invasive procedure in which a thin telescope is passed into the urinary tract and a laser is used to break the stone into fragments. It is highly effective for stones in the ureter and kidney and is one of the most commonly performed stone treatments.
Extracorporeal Shock Wave Lithotripsy (ESWL) uses sound waves from outside the body to break stones into smaller pieces. It works best for certain stone types and locations.
Percutaneous Nephrolithotomy (PCNL) is used for very large or complex stones and involves a small incision in the back to access the kidney directly.
How to Reduce Your Risk of Kidney Stones
Prevention is genuinely possible for most people. The steps are straightforward.
- Drink more water. Aim for at least 2.5 to 3 litres of fluid daily. Your urine should be pale yellow. If it is dark, you are not drinking enough. In Bengaluru’s warm climate, you may need more in summer months or after physical activity.
- Reduce salt intake. High sodium raises calcium levels in the urine, increasing stone risk. Avoid processed foods, canned goods, and adding extra salt at the table.
- Moderate animal protein. Eating large amounts of red meat, poultry, or seafood raises uric acid levels. A balanced diet with adequate plant-based protein is better for stone prevention.
- Do not avoid calcium. Many people with calcium oxalate stones mistakenly cut out dairy, thinking it will help. This can actually increase stone risk. Calcium from food binds oxalate in the gut and prevents it from reaching the kidneys. Speak to your doctor before making significant dietary changes.
- Limit oxalate-rich foods if you have calcium oxalate stones. Spinach, nuts, chocolate, and strong tea are high in oxalate. These do not need to be eliminated, but moderation is advised if you have a history of this stone type.
- Maintain a healthy weight. Obesity increases the risk of several stone types. Regular physical activity and a balanced diet support stone prevention alongside overall health.
When to See a Urologist
Some kidney stone episodes are manageable at home with pain relief and increased fluids. Others need prompt medical attention.
See a doctor without delay if you experience:
- Severe pain that is not controlled by over the counter pain relief
- Blood in the urine, even if it resolves on its own
- Fever or chills alongside back or abdominal pain
- Complete inability to urinate
- Persistent nausea or vomiting that prevents you from staying hydrated
- A history of kidney stones with new or recurring symptoms
Do not wait to see if symptoms pass if fever is present. Fever alongside urinary symptoms can signal a kidney infection that needs urgent treatment.
At Nephro Uro Clinic in Bengaluru, Dr. I. R. Ravish evaluates kidney stone cases with a thorough assessment including imaging and urine analysis, and provides a clear plan for treatment and long-term prevention tailored to each patient.
Conclusion
Most kidney stones give warning signs before they cause a serious problem. Pain in the side or back, burning during urination, blood in the urine, or a frequent urge to go are all signals worth taking seriously.
The earlier a kidney stone is identified, the more treatment options are available and the simpler those options tend to be. A small stone caught early may need nothing more than increased hydration and monitoring. A large stone identified late may need a procedure.
If something feels off with your urinary health, trust that instinct. A simple urine test or scan can provide clarity quickly. Kidney stones are very treatable, and with the right guidance, most people can significantly reduce their risk of recurrence.
