Sharp Side Pain? Why Your Kidneys Are Forming Stones & Medical Next Steps

Sharp, stabbing pain in your side or lower back can be alarming. One common cause is kidney stones—hard mineral deposits that form inside the kidneys and can move into the urinary tract. While kidney stones are common, they should never be ignored.

Understanding why kidney stones form and knowing what to do next can help you act quickly and protect your health.

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What Are Kidney Stones?

Kidney stones are solid, pebble-like clumps made of minerals and salts. They form when substances in your urine—like calcium, oxalate, and uric acid—become too concentrated and crystallize.

Your kidneys normally filter waste and extra fluid from your blood to make urine. When urine becomes overly concentrated, crystals can stick together and grow into stones.

Kidney stones can range in size from a grain of sand to a golf ball. Smaller stones may pass on their own. Larger ones can block the flow of urine and cause intense pain.

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What Does Kidney Stone Pain Feel Like?

The classic symptom of kidney stones is sudden, severe pain. It often:

• Starts in the side or back (below the ribs)
• Radiates toward the lower abdomen or groin
• Comes in waves (called renal colic)
• Changes intensity as the stone moves

Other possible symptoms include:

• Blood in the urine (pink, red, or brown urine)
• Burning or pain with urination
• Frequent urge to urinate
• Nausea or vomiting
• Fever or chills (this can signal infection and is urgent)

Pain from kidney stones is often described as one of the most intense types of pain people experience. However, not every case is dramatic. Some stones cause mild discomfort or no symptoms at all until they move.

If you're experiencing sharp side pain and want to quickly understand what might be causing your symptoms, try Ubie's free AI symptom checker to get personalized insights in just 3 minutes and learn whether you should seek medical care right away.

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Why Are Your Kidneys Forming Stones?

Kidney stones develop for several reasons. Often, it's a combination of factors.

1. Dehydration

Not drinking enough fluids is the most common cause. When you're dehydrated:

• Your urine becomes concentrated
• Minerals are more likely to crystallize
• Stones form more easily

Hot climates, heavy sweating, and low fluid intake all increase risk.

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2. Diet

Certain foods can increase the likelihood of kidney stones, especially in people who are prone to them.

Risk factors include:

• High salt (sodium) intake
• High animal protein consumption
• Excessive oxalate-rich foods (spinach, nuts, chocolate)
• Sugary beverages, especially those with high fructose corn syrup

Contrary to what many people think, completely avoiding calcium is not usually recommended. In fact, normal dietary calcium can help reduce stone risk by binding oxalate in the gut.

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3. Family History

If a parent or sibling has had kidney stones, your risk increases. Genetics play a role in how your body processes minerals.

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4. Medical Conditions

Several health issues increase the risk of kidney stones, including:

• Obesity
• Type 2 diabetes
• Gout
• Hyperparathyroidism
• Recurrent urinary tract infections
• Digestive diseases or bariatric surgery

These conditions may change how your body absorbs or excretes minerals.

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5. Certain Medications

Some medications can contribute to kidney stones, including:

• Certain diuretics
• Calcium-based antacids (in excess)
• Some antiviral or seizure medications

If you've developed kidney stones and take prescription medication, speak with your doctor before making changes.

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Types of Kidney Stones

Understanding the type of kidney stone helps guide prevention.

• Calcium stones (most common)
  • Usually calcium oxalate
• Uric acid stones
  • More common in people with gout or high protein intake
• Struvite stones
  • Often related to urinary infections
• Cystine stones
  • Rare, inherited condition

Your doctor may ask you to strain your urine to catch a stone for testing.

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When Is It an Emergency?

Some kidney stones require urgent care.

Seek immediate medical attention if you experience:

• Fever and chills
• Severe pain that doesn't improve
• Persistent vomiting
• Inability to urinate
• Signs of infection
• Confusion or weakness

A blocked kidney with infection can become life-threatening if not treated promptly.

If you think your symptoms may be serious or life-threatening, speak to a doctor or seek emergency care immediately.

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How Are Kidney Stones Diagnosed?

A healthcare provider may use:

• CT scan (most accurate)
• Ultrasound (common in pregnancy)
• Urine tests (to check for blood, infection, crystals)
• Blood tests (to assess kidney function and mineral levels)

Imaging helps determine:

• Size of the stone
• Location
• Whether there is blockage

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Treatment: What Happens Next?

Treatment depends on the size and location of the kidney stone.

Small Stones (Usually Under 5mm)

These often pass on their own with:

• Increased fluid intake
• Pain medication
• Medications that relax the ureter (like alpha-blockers)

You may be advised to drink enough water to produce clear or light-yellow urine.

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Larger Stones

If a stone cannot pass naturally, procedures may be needed:

• Shock wave lithotripsy (SWL) – uses sound waves to break stones into smaller pieces
• Ureteroscopy – a small scope removes or breaks the stone
• Percutaneous nephrolithotomy – surgery for very large stones

These treatments are common and generally safe, but recovery varies.

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Preventing Future Kidney Stones

If you've had one kidney stone, your risk of another increases. Prevention matters.

Here are evidence-based steps:

✅ Drink More Fluids

• Aim for enough to produce 2–2.5 liters of urine daily
• Water is best

✅ Reduce Sodium

• Limit processed foods
• Check food labels

✅ Eat Moderate Protein

• Especially animal protein
• Balance with fruits and vegetables

✅ Maintain Healthy Weight

• Obesity increases stone risk

✅ Follow Medical Advice

• Your doctor may prescribe medication based on stone type
• You may need a 24-hour urine collection to identify specific risks

Do not self-restrict calcium without medical guidance.

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The Bottom Line

Sharp side pain could be kidney stones—but only proper medical evaluation can confirm that. While many stones pass on their own, some require urgent treatment.

Kidney stones form when urine becomes concentrated and minerals crystallize. Dehydration, diet, genetics, and medical conditions all play a role. The good news: with the right treatment and prevention strategies, most people can significantly reduce their risk of recurrence.

If you're experiencing concerning symptoms and want to better understand what might be happening, check your symptoms with Ubie's free AI-powered tool to receive personalized guidance and help determine your best next steps for care.

Most importantly, speak to a doctor about any symptoms that are severe, persistent, or concerning. Fever, uncontrolled pain, vomiting, or difficulty urinating should never be ignored.

Kidney stones are common—but serious complications are preventable with prompt care and informed next steps.