Kidney stones bring a lot of questions — before, during, and after that first painful episode. This FAQ collects the most common ones we get, with clear, plain-English answers and links to deeper guides whenever you want more detail.
We have organized questions into sections: basics, symptoms and diagnosis, treatment, diet and prevention, special situations, and long-term outlook.
The Basics
What is a kidney stone?
A kidney stone is a hard, crystal-like mineral deposit that forms inside the kidney when certain substances in your urine — most commonly calcium, oxalate, and uric acid — become too concentrated and stick together. See our full guide to what kidney stones are.
How big can kidney stones get?
Stones can range from tiny specks of "sand" to golf-ball-sized masses. Most passable stones are 5 mm or less. Anything above about 7 mm usually needs medical help.
What are the different types of kidney stones?
The five main types are:
- Calcium oxalate stones
- Calcium phosphate stones
- Uric acid stones
- Struvite stones (infection stones)
- Cystine stones
Who gets kidney stones?
Men are somewhat more likely than women, and stones are more common between ages 30 and 60. Family history, obesity, dehydration, diet, and certain medical conditions all raise risk. But anyone can develop stones.
Symptoms and Diagnosis
What does a kidney stone feel like?
Most people describe intense pain in the side or back that comes in waves. Pain may radiate to the lower abdomen and groin, and often shifts as the stone moves. Nausea, vomiting, blood in the urine, and a frequent urge to urinate are common companions. Read our full symptoms guide.
Can I have a kidney stone with no pain?
Yes. Small stones sitting in the kidney can be silent for years, only causing symptoms when they move or block urine flow.
How are kidney stones diagnosed?
Common tools include:
- Non-contrast CT scan — the gold standard for detecting stones
- Ultrasound — often used in pregnancy and children
- X-ray (KUB) — for follow-up in certain stone types
- Urinalysis and blood tests
- 24-hour urine collection for recurrent stone formers
When should I go to the ER?
Seek immediate care if you have:
- Severe pain that is unmanageable at home
- Fever or chills
- Persistent nausea and vomiting
- Blood clots in the urine
- Trouble urinating or a decrease in urine output
- Signs of infection combined with a known stone
Treatment
Do kidney stones always require surgery?
No. Most small stones pass on their own with hydration, pain control, and time. Treatments become necessary for larger stones or those causing infection or persistent blockage.
What are the main treatment options for larger stones?
| Treatment | How It Works |
|---|---|
| Shockwave lithotripsy (ESWL) | External shock waves break the stone into smaller pieces |
| Ureteroscopy | Small scope inserted through the urinary tract; laser fragments stones |
| Percutaneous nephrolithotomy (PCNL) | Small incision in the back; used for large kidney stones |
| Medical expulsive therapy | Medications like tamsulosin help pass smaller stones |
Are there medications that dissolve stones?
Uric acid stones can often be dissolved with medications like potassium citrate, which raises urine pH. Cystine stones can sometimes be dissolved with specialized medications. Calcium-based stones are not dissolvable but can be prevented from growing.
Diet and Prevention
What is the number one diet change to prevent kidney stones?
Drinking more fluids. Nothing else matches it. Aim for enough fluid to produce 2–2.5 liters of urine per day. See our hydration guide.
Should I avoid calcium if I have kidney stones?
No. Most people should eat normal dietary calcium — 1,000 to 1,200 mg per day from food. Cutting calcium often increases stone risk. See our calcium guide.
What foods should I limit?
Depending on your stone type, focus areas commonly include:
- High-sodium packaged and restaurant foods
- Very large portions of animal protein
- Very high-oxalate foods (spinach, rhubarb, almonds, sesame) — see foods high in oxalate
- Sugar-sweetened beverages, especially colas
Are there specific diets for stone prevention?
The DASH diet — rich in fruits, vegetables, low-fat dairy, and whole grains — is one of the best-studied diets for lowering stone risk. A Mediterranean-style pattern also fits well.
Does drinking lemon water really help?
Yes. Lemon juice is high in citrate, one of the body's natural stone inhibitors. Regular lemon or lime water is a simple, evidence-based habit. See our citrate guide.
Special Situations
Are kidney stones dangerous during pregnancy?
They can be more challenging because imaging and medication choices are limited. Most pregnant patients with stones are managed conservatively with hydration and pain relief. Any suspected stone during pregnancy should be evaluated promptly.
Do children get kidney stones?
Yes, and the rate is rising. Risk factors include low fluid intake, high-sodium diets, and family history. Prevention strategies are similar to those for adults, adjusted for age.
Can I still exercise with a history of kidney stones?
Absolutely. Regular activity is beneficial. Just be sure to hydrate well before, during, and after exercise — especially in hot climates.
How does bariatric surgery affect stone risk?
Some weight-loss surgeries (particularly Roux-en-Y bypass) increase oxalate absorption from the gut and raise the risk of calcium oxalate stones. Special dietary care is often needed after surgery.
Long-Term Outlook
Will I get another kidney stone?
Without changes, roughly half of people who form one stone will form another within 5–10 years. With consistent hydration and dietary changes, that number drops significantly.
How often should I follow up?
Follow-up depends on stone history and metabolic findings. Many stone formers benefit from:
- A 24-hour urine test after their first passed stone
- Annual check-ins with a urologist or dietitian
- Imaging follow-up if stones remain in the kidney
Can I live a normal life after a kidney stone?
Yes. Most people go back to full activity within days to a couple of weeks after passing a stone or a minor procedure. Long-term, the biggest change is simply better habits — hydration, mindful eating, and paying attention to your body.
References
- National Kidney Foundation — Kidney Stones: Overview and Prevention.
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK / NIH) — Kidney Stones.
- Mayo Clinic — Kidney Stones: Symptoms and Causes.
- Cleveland Clinic — Kidney Stones: Diagnosis and Treatment.
- American Urological Association — Medical Management and Surgical Management of Kidney Stones Guidelines.
- Urology Care Foundation — Patient Education on Kidney Stones.
The Bottom Line
Kidney stones are common, painful, and highly preventable. The strategies that work are simple and repeatable: drink enough fluid, watch sodium, keep dietary calcium normal, eat plenty of fruits and vegetables, moderate animal protein, and address specific metabolic issues with your provider. Consistent habits are stronger than perfect ones. Small choices, made every day, are what keep new stones from forming.
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