Signs and Symptoms of Kidney Stones: 7 Warning Signs You Shouldn’t Ignore

A sudden pain in your side can interrupt your work, disturb your sleep, or make even walking uncomfortable. You might wonder whether it comes from a muscle, a digestive problem, or something affecting your kidneys. Recognizing the signs and symptoms of kidney stones can help you understand when medical evaluation matters.

Kidney stones do not always cause noticeable problems while they remain inside the kidneys. Symptoms often develop when a stone moves into the ureter, the narrow tube carrying urine toward the bladder. The resulting discomfort can range from mild pressure to severe, fluctuating pain.

Understanding these warning signs is only part of the picture. Knowing what creates kidney stones, how doctors identify them, and what helps prevent recurrence can also guide your next steps.

What Are Kidney Stones, and Why Do They Form?

Kidney stones are hard deposits made from minerals and other substances in urine. They form when urine contains more stone-forming substances than its fluid can dilute. These substances may gradually crystallize and join together into a larger stone.

People often ask what produces kidney stones or what triggers kidney stones in the first place. Dehydration can increase the concentration of minerals in urine, but it is not the only factor. Family history, certain medical conditions, dietary patterns, and previous stones can also influence risk.

The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) explains how these deposits form and which factors may contribute. Understanding your stone type can help a healthcare professional recommend more specific prevention measures.

7 Signs and Symptoms of Kidney Stones to Recognize

1. Sharp Pain in the Side or Back

One of the most recognizable renal stones symptoms is sharp pain in the back or side, usually below the ribs. The pain may begin suddenly and become intense enough to interrupt ordinary activities. It can also spread toward the lower abdomen or groin.

This discomfort often occurs when a stone moves into the ureter or obstructs urine flow. The ureter may contract around the stone, creating significant pressure and pain. However, back pain alone does not confirm a kidney stone.

Muscle strain, spinal problems, and other abdominal conditions can produce similar discomfort. Seek medical assessment when pain is severe, persistent, or unexplained, rather than assuming the kidneys are responsible.

2. Pain That Comes and Goes in Waves

Kidney stone pain does not always remain at the same intensity. You may experience periods of severe discomfort followed by temporary relief. These fluctuations can make it difficult to predict when the pain will return.

The changing intensity may reflect contractions and pressure within the urinary tract as the stone moves. Some people find it difficult to sit still or discover a comfortable position. Others experience pain that travels toward the groin as the stone progresses.

Even when the pain temporarily disappears, the underlying problem may remain. A reduction in discomfort does not prove that the stone has passed or that an obstruction has resolved.

3. Blood in the Urine

Blood in the urine is another important sign of kidney stones. Your urine may look pink, red, or brown, although the blood may be invisible without laboratory testing. A stone can irritate the lining of the urinary tract as it moves.

Not everyone with a kidney stone notices visible blood. Conversely, blood in the urine can have causes other than stones, including infections and other urinary conditions. Therefore, unexplained blood deserves medical evaluation even when it causes no pain.

Do not dismiss this symptom simply because it disappears. A healthcare professional can determine whether urine testing, imaging, or another investigation is appropriate.

4. Frequent Urination, Burning, or Urinary Urgency

Some kidney stones and symptoms become more noticeable when a stone reaches the lower part of the ureter. You may feel an urgent need to urinate, visit the bathroom more frequently, or experience discomfort while passing urine. These symptoms can resemble a urinary tract infection.

A stone near the bladder can irritate the urinary tract without causing the classic severe back pain. You might also feel pressure in the lower abdomen. However, burning and urgency can occur with infections and other conditions, so symptoms alone cannot establish the cause.

Difficulty passing urine or producing only a small amount requires particular attention. Seek prompt medical advice, especially when urinary changes accompany significant pain or a known stone.

5. Nausea or Vomiting

Kidney stones can trigger nausea, and some people vomit during intense episodes of pain. This response can occur because nerves serving the kidneys and digestive system interact. Severe pain may also make it difficult to eat or drink normally.

Occasional nausea does not necessarily indicate a dangerous complication. However, repeated vomiting can cause dehydration and make it harder to keep fluids or prescribed medication down. Dehydration may further complicate an already painful episode.

Seek urgent medical care if you cannot keep fluids down or develop severe pain with repeated vomiting. A clinician can assess dehydration, control symptoms, and determine whether the stone needs treatment.

6. Cloudy or Bad-Smelling Urine

Cloudy urine or an unusual smell can sometimes accompany urinary tract problems. These changes may occur alongside kidney stones, but they do not specifically identify a stone. Concentrated urine, dietary factors, and infections can also affect urine appearance or odor.

A stone that obstructs urine flow can increase concern about infection. An infected, obstructed urinary system may become dangerous and requires urgent medical treatment. Fever, chills, or feeling seriously unwell alongside urinary symptoms are particularly concerning.

Do not rely on urine color or smell alone to decide whether an infection exists. A urine test and clinical assessment can help distinguish infection from other explanations.

7. Fever, Chills, or Feeling Seriously Unwell

Fever and chills are not symptoms to ignore when kidney stones are suspected. They can indicate a urinary infection, including an infection involving the kidneys. The combination of infection and urinary obstruction can become a medical emergency.

You may also experience marked weakness, worsening pain, or a general sense that something is seriously wrong. Some people develop vomiting or difficulty passing urine at the same time. These symptoms need urgent assessment rather than home observation.

Seek emergency medical care if you have suspected kidney stones with fever or chills, especially alongside severe pain or reduced urine output. Complete inability to urinate also requires emergency evaluation.

Can Kidney Stones Remain Hidden?

Yes. Small stones may stay inside the kidneys without causing noticeable symptoms. Some pass through the urinary tract without producing obvious discomfort, while others appear incidentally during imaging for an unrelated problem.

This explains why the absence of pain does not always mean a person has no stones. The phrase kidney stones in the kidneys describes their location, not whether they are causing symptoms. Their size, position, and effect on urine flow all influence how they behave.

If imaging identifies a stone without symptoms, a clinician may recommend monitoring or treatment depending on its characteristics. The appropriate plan depends on the risk of blockage, infection, growth, and other complications.

What Causes Renal Stones to Develop?

People searching for what causes renal stones should know that several different processes can lead to stone formation. Calcium stones are common, while uric acid, struvite, and cystine stones develop under different conditions. Each type has distinct contributing factors.

Low fluid intake can concentrate urine and increase the likelihood of crystal formation. High sodium intake may increase urinary calcium, while some dietary patterns can influence uric acid or oxalate levels. Certain digestive disorders, metabolic conditions, medications, and inherited factors also affect risk.

It is not accurate to blame every kidney stone on eating too much calcium. Normal dietary calcium can help reduce oxalate absorption in the digestive tract. Restricting calcium without medical advice may therefore be inappropriate for some people.

The NIDDK’s nutrition guidance explains how fluid intake, sodium, calcium, and other dietary factors relate to stone prevention. Recommendations should reflect the stone type and the person’s medical history.

How Doctors Diagnose Kidney Stones

A clinician may review your symptoms, medical history, previous stones, medications, and family history. Urine tests can identify blood, signs of infection, or substances associated with stone formation. Blood tests may reveal kidney function problems or mineral abnormalities.

Imaging helps locate a stone and assess its size and possible obstruction. Depending on the circumstances, a clinician may use ultrasound, CT scanning, or another suitable test. The choice depends on factors such as age, pregnancy status, symptom severity, and clinical findings.

If you pass a stone, collecting it for laboratory analysis may help identify its composition. People with repeated stones may also need additional metabolic testing. The NIDDK diagnostic guide explains common tests used to investigate kidney stones.

Treatment Options and Ways to Prevent Recurrence

Treatment depends on the stone’s size, location, composition, symptoms, and whether it blocks urine flow. Some small stones pass without a procedure, while others require medical assistance. A clinician may recommend pain relief, appropriate fluids, or medication that helps selected stones pass.

Larger stones, persistent obstruction, severe pain, or complications may require a procedure. Options include shock-wave lithotripsy, ureteroscopy, and other interventions chosen for the individual situation. An infected obstruction requires urgent medical treatment rather than waiting for a stone to pass naturally.

Prevention starts with understanding why the stone formed. Drinking enough water is helpful for many people, but fluid targets must account for heart disease, kidney disease, and any medical fluid restrictions. Your clinician may recommend urine testing to guide a more personalized plan.

Dietary changes also depend on the stone type. Some people benefit from reducing sodium, while others need guidance about animal protein or oxalate intake. Do not eliminate calcium-rich foods or begin supplements without discussing your needs with a healthcare professional.

For people with recurrent stones, a stone analysis and sometimes a 24-hour urine test can reveal useful information. A clinician may recommend specific medication when diet and fluid changes alone are insufficient. Tailored prevention is generally more useful than following a restrictive diet designed for someone else’s stone type.

When Should You Seek Medical Help?

Seek prompt medical evaluation for severe or unexplained side pain, blood in your urine, or new urinary difficulties. Fever, chills, repeated vomiting, or feeling seriously unwell require urgent attention when a kidney stone is possible. These signs may indicate infection or another condition needing rapid treatment.

Complete inability to urinate is an emergency. Do not try to force a stone out by rapidly drinking excessive amounts of water. If you have kidney disease, heart disease, or a prescribed fluid restriction, follow your clinician’s fluid advice.

Remember that kidney stone symptoms can overlap with other illnesses. A medical assessment can help establish the diagnosis and identify complications that symptoms alone cannot reveal.

Learn More About Kidney Stones and Their Warning Signs

The signs and symptoms of kidney stones can vary from mild urinary discomfort to severe pain, vomiting, or visible blood. Recognizing these changes matters, but understanding the type of stone and the reason it formed can also help guide future prevention.

If you want to explore this topic further, continue to the next page to watch the related video. It can provide another opportunity to learn about kidney stones, urinary discomfort, and questions worth discussing with your healthcare professional.

Medical disclaimer: This article provides general educational information and does not replace professional medical advice, diagnosis, or treatment.