Can Back Pain Be Caused by Kidney Stones?

Quick Answer

Yes, kidney stones can cause back pain. The pain is typically sharp, severe, and located in the side and back, below the ribs. It often radiates to the lower abdomen and groin. This pain occurs when a stone moves within the kidney or passes into the ureter, the tube connecting the kidney to the bladder.

How Kidney Stones Cause Back Pain

Kidney stones (renal calculi) are hard deposits made of minerals and salts that form inside your kidneys. When these stones move or become lodged in the urinary tract, they can cause significant pain. Here’s how it happens:

Mechanism of Pain

• Obstruction: When a stone blocks the ureter, urine backs up into the kidney, causing pressure and swelling (hydronephrosis). This stretching of the kidney capsule triggers pain.
• Spasms: The ureter tries to push the stone out by contracting, leading to painful spasms.
• Irritation: The stone can irritate or damage the lining of the urinary tract, causing inflammation and pain.

Location of Pain

The pain from kidney stones is usually felt in the flank area—the side of the body between the ribs and hip. It may also radiate to:

• Lower abdomen
• Groin
• Genital area (in men, pain may extend to the testicles)

The pain often comes in waves and can be excruciating, prompting many people to seek emergency care.

Other Symptoms of Kidney Stones

Back pain alone isn’t enough to diagnose kidney stones. Look for these additional symptoms:

• Hematuria (blood in urine): Urine may appear pink, red, or brown.
• Frequent urination: You may feel the need to urinate more often than usual.
• Painful urination: Burning or stinging sensation when urinating.
• Nausea and vomiting: Common due to the severe pain and shared nerve pathways with the digestive system.
• Fever and chills: If an infection is present, you may develop a fever (seek medical attention immediately).
• Cloudy or foul-smelling urine: Signs of infection or urine concentration.

According to the Mayo Clinic, symptoms can vary depending on the size and location of the stone.

How Common Is This?

Kidney stones are a common condition, affecting about 1 in 10 people at some point in their lives, per the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). The prevalence has been increasing in recent decades, possibly due to dietary factors and obesity.

• Men are more likely to develop kidney stones than women.
• The risk increases with age, peaking between 40 and 60 years old.
• Once you’ve had one kidney stone, you have a 50% chance of developing another within 5–10 years.

Differentiating From Other Causes

Back pain can stem from many conditions, not just kidney stones. Here’s how to tell the difference:

Kidney Stone Pain vs. Muscular Back Pain

Other Conditions That Mimic Kidney Stone Pain

• Urinary Tract Infection (UTI): Causes burning with urination, frequent urination, and sometimes back pain, but usually no radiating pain to the groin.
• Appendicitis: Pain starts near the belly button and moves to the lower right abdomen (not typically the back).
• Gallstones: Pain is in the upper right abdomen and may radiate to the back or shoulder.
• Herniated Disc: Back pain that radiates down the leg (sciatica), often with numbness or tingling.
• Pyelo nephritis (kidney infection): Causes fever, chills, and flank pain, but usually no groin radiation.

Getting a Diagnosis

If you suspect kidney stones, see a healthcare provider for a proper diagnosis. Tests may include:

Diagnostic Tests

• Urinalysis: Checks for blood, infection, or crystals in the urine.
• Blood Tests: Evaluates kidney function and checks for signs of infection (e.g., elevated white blood cell count).
• Imaging Tests:
  • CT Scan: The most common test to detect kidney stones. It provides detailed images of the urinary tract.
  • Ultrasound: Used in pregnant women or when CT scans are not available.
  • X-ray: Can detect some stones but may miss smaller ones.
• Analysis of Passed Stones: If you pass a stone, your doctor may ask you to collect it for lab analysis to determine its composition.

The Centers for Disease Control and Prevention (CDC) recommends imaging tests to confirm the diagnosis and rule out other conditions.

Treatment Options

Treatment depends on the size, location, and type of kidney stone, as well as the severity of symptoms.

Small Stones (Less than 5 mm)

Most small stones pass on their own within a few days to weeks. Treatment focuses on managing symptoms:

• Hydration: Drink 2–3 liters of water daily to help flush the stone out.
• Pain Relief: Over-the-counter pain medications like ibuprofen (Advil) or acetaminophen (Tylenol). Prescription painkillers may be needed for severe pain.
• Alpha Blockers: Medications like tamsulosin (Flomax) can relax the ureter muscles, helping the stone pass faster.

Large Stones (5 mm or Larger)

Larger stones are less likely to pass on their own and may require medical intervention:

• Extracorporeal Shock Wave Lithotripsy (ESWL): Uses sound waves to break the stone into smaller pieces that can pass more easily.
• Ureteroscopy: A thin scope is inserted through the urethra and bladder to remove or break up the stone.
• Percutaneous Nephrolithotomy: A surgical procedure to remove large stones directly from the kidney.

Prevention

To reduce the risk of future kidney stones:

• Drink plenty of water (aim for pale yellow urine).
• Reduce sodium intake (high salt increases calcium in urine).
• Limit animal protein (red meat, poultry, eggs).
• Avoid excessive oxalate-rich foods (spinach, nuts, chocolate) if you form calcium oxalate stones.
• Talk to your doctor about medications if you have recurrent stones (e.g., thiazide diuretics for calcium stones).

The National Kidney Foundation provides detailed dietary guidelines for prevention.

When It's NOT Kidney Stones

If your back pain isn’t caused by kidney stones, other possible causes include:

• Muscle Strain: Overuse, poor posture, or injury to back muscles.
• Herniated Disc: A disc in the spine ruptures, pressing on nerves.
• Sciatica: Compression of the sciatic nerve, causing pain that radiates down the leg.
• Spinal Stenosis: Narrowing of the spinal canal, often due to arthritis.
• Kidney Infection (Pyelo nephritis): Requires antibiotics; symptoms include fever and flank pain.
• Endometriosis (in women): Can cause cyclic back pain.
• Aortic Aneurysm: A rare but life-threatening cause of sudden, severe back pain.

When to See a Doctor

Even if your symptoms are mild, see a doctor if:

• Pain persists for more than a few days.
• You have a history of kidney stones.
• You develop new or worsening symptoms.

The UK National Health Service (NHS) advises contacting a healthcare provider if you suspect kidney stones, especially if pain is severe or accompanied by other symptoms.

Key Takeaways

• Kidney stones can cause severe back pain, usually in the flank area, radiating to the groin.
• Other symptoms include blood in urine, nausea, vomiting, and painful urination.
• Diagnosis typically involves urinalysis, blood tests, and imaging (CT scan or ultrasound).
• Small stones often pass on their own with hydration and pain management.
• Large stones may require medical procedures like lithotripsy or surgery.
• Prevention includes staying hydrated, reducing salt, and limiting animal protein.
• Seek emergency care for severe pain, fever, or inability to urinate.
• Other causes of back pain include muscle strain, herniated discs, and infections.