Evidence-based|Sources: NIH, WHO, AHA, AGS clinical guidelines|Updated 2026

1 What are kidney stones? Common symptoms ▾

Kidney stones are hard crystals that form in the kidneys and can move into the ureter (the tube to the bladder). A stone can irritate or block the flow of urine, causing sudden flank or side pain that can spread to the groin.

Typical symptoms

Sharp, wave-like pain in the back/side, lower belly, or groin
Nausea or vomiting during pain episodes
Blood in urine (pink, red, or tea-colored)
Urgency or frequent urination if the stone is near the bladder

Why stones form

Low fluid intake → concentrated urine
High salt intake (sodium) increases calcium in urine
Diet high in oxalate (some nuts, spinach) in certain people
Uric acid, infections, or rare genetic conditions

2 Red flags — when to go to urgent care or ER ▾

Fever or chills with severe flank pain (possible infected blockage — emergency)
Unable to pass urine, severe unrelenting pain, or repeated vomiting
Pain with lightheadedness, fainting, or confusion
Single kidney, known kidney disease, or recent kidney surgery with new severe pain

Don’t wait if you have fever with stone-like pain—seek emergency care.

3 How doctors diagnose a stone ▾

Common tests

Urinalysis (blood, infection markers, crystals)
Blood tests (kidney function, uric acid—when indicated)
Imaging: ultrasound (no radiation) or low-dose CT for clarity

What size means

≤ 5 mm often pass on their own
5–10 mm may pass or may need help
> 10 mm usually need a procedure

Location matters: stones near the bladder may pass more easily.

4 Pain control, fluids, and helping a stone pass ▾

Pain control

Follow your clinician’s plan (some prefer certain pain relievers for stones)
Heat pad to the flank can ease muscle spasm
Call if pain remains severe despite medication

Fluids

Steady sips through the day (unless you were told to restrict)
Goal urine: pale yellow—avoid “dark apple juice” color
If heart/kidney issues: ask for a safe fluid target first

Medical expulsive therapy

Some clinicians use a short course of a medicine that relaxes the ureter
Best for stones in the lower ureter, size-dependent
Report dizziness, lightheadedness, or side effects promptly

Strain urine (a simple filter) to catch the stone; bring it for analysis to guide prevention.

5 Stone types & what to eat (simple rules) ▾

Stone type	Limit	Helpful choices
Calcium oxalate (most common)	High-oxalate foods (e.g., spinach, almonds) in large amounts; high sodium	Normal dietary calcium with meals (dairy or fortified) binds oxalate; lemon/lime for citrate; drink water
Uric acid	Purine-heavy foods in excess (some red meats, organ meats)	More vegetables/fiber, adequate fluids; some need urine alkalinization (clinician-guided)
Struvite (infection stones)	—	Treat and prevent UTIs; procedures often required to clear stone
Cystine (rare, inherited)	—	High fluid goals; specialized medications—urology guidance

Universal prevention

Fluids: enough to keep urine pale (ask for your safe target)
Salt: reduce sodium—salty packaged foods and restaurant meals add up
Balanced calcium: don’t cut all calcium; include normal portions with meals

Extras that help many

Lemon or lime in water (citrate can protect against stones)
Steady activity and regular meals—avoid long fasts with dehydration
Review supplements (high-dose vitamin C or D may be an issue for some)

6 24-hour urine & lab follow-up (why it matters) ▾

A 24-hour urine test measures volume and minerals to tailor prevention. Common targets your team may discuss:

Focus	Plain meaning
Urine volume	Higher volume dilutes stone-forming minerals
Calcium, oxalate, uric acid	Too much raises stone risk; diet or meds may adjust
Citrate	Natural inhibitor—more citrate usually protects
pH	Acidic urine favors uric acid stones; alkalinization may help (if advised)

7 When a procedure is needed ▾

Procedures are used for larger stones, stuck stones, severe symptoms, or infection behind a blockage. Your urology team chooses based on size, location, and your health.

Option	What it does	Notes
ESWL (shock wave)	Breaks stones into passable pieces from outside the body	Best for certain kidney/upper ureter stones; may need follow-up
Ureteroscopy (laser)	Scope via bladder to the stone; laser fragments and pieces removed	Common; a temporary stent may be placed to aid drainage
PCNL	Small back incision to access and remove large stones	Used for big/complex stones; hospital stay likely
Emergency drainage	Stent or nephrostomy for infected obstruction	Life-saving priority—clear infection and urine flow first

8 Home care & safety checklist ▾

Do

Steady fluids unless told otherwise; aim for pale urine
Use heat for comfort; rest during pain waves
Take prescribed meds exactly as directed
Strain urine to capture the stone for analysis

Call promptly if

Fever/chills or burning urine with severe pain
Unable to urinate, or pain stays severe
Worsening nausea/vomiting or signs of dehydration

9 FAQs & next steps ▾

How long does it take to pass a small stone?

Some pass within days; others take a few weeks. Location, size, and your anatomy all matter. Your team guides expectations and follow-up imaging if needed.

Should I stop all calcium?

Not usually. Normal dietary calcium with meals can actually reduce certain stones by binding oxalate in the gut. Your clinician will advise if supplements are appropriate.

Do lemon or citrate drinks help?

For many people, citrate is protective. Flavoring water with lemon or lime is a simple way to add citrate—useful alongside adequate fluids and salt reduction.

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Educational content only. Always follow your clinician’s advice.

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Medical DisclaimerThis article is for educational purposes only and is not a substitute for professional medical advice. Always consult your doctor before starting supplements or changing medications. Learn about our editorial process.

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