What are kidney stones?
In short Hard crystals that form from minerals or acids in urine. They can block urine flow in the kidney or ureter and cause severe pain, nausea, and bleeding. Older adults are more prone to dehydration and medication interactions, so senior-safe care matters.
Good to know: Many stones pass on their own within a few weeks, especially if small (<5 mm). Larger stones or infection with blockage needs urgent attention.
Typical symptoms
- Sudden severe flank/back pain that comes in waves, may move to groin
- Blood in urine (pink/red/brown) or burning with urination
- Nausea/vomiting, restlessness
- Frequent urination, urgency, or reduced urine stream
- Fever/chills with pain (medical emergency)
Related topics
- Chronic Kidney Disease (CKD) · Hydration & Drinks
- Urinary Symptoms (A–Z) · BP & Heart
When to seek urgent care
- Fever, shaking chills, or feeling very unwell with back/flank pain
- Unable to pass urine, or single kidney with severe pain
- Uncontrolled pain or vomiting despite medicines
- Confusion, weakness, or fainting
Blockage + infection can become life-threatening and needs immediate treatment.
Stone types & causes
| Type | Why it forms | Common drivers |
|---|---|---|
| Calcium oxalate (most common) | Calcium + oxalate crystallize | Low fluids, high sodium, high oxalate foods, low citrate, metabolic issues |
| Calcium phosphate | High urine pH or calcium | Alkaline urine, certain meds, distal RTA |
| Uric acid | Acidic urine → uric acid crystals | Gout, diabetes/metabolic syndrome, low urine volume |
| Struvite | Infection-related | Recurrent UTIs with urease-producing bacteria |
| Cystine | Inherited (cystinuria) | Very high cystine in urine—needs aggressive hydration |
How stones are diagnosed
Tests
- Urinalysis (blood, crystals, infection); urine culture if fever
- Imaging: ultrasound (no radiation) or non-contrast CT
- Blood tests: kidney function, electrolytes
After the episode
- Strain urine to catch the stone for analysis
- Consider 24-hour urine test for prevention plan (volume, calcium, citrate, uric acid, oxalate, sodium)
Treatment: pass vs. procedure
Passing a small stone
- Hydration as advised; rest and gentle walking
- Pain relief: paracetamol/acetaminophen first; NSAIDs may be used if safe for kidneys/heart (check with clinician)
- Medical expulsive therapy: tamsulosin (alpha-blocker) can help some ureter stones
When procedures are needed
- ESWL (shock waves) for select stones
- Ureteroscopy with laser to break and remove stones
- PCNL for very large/complex stones
- Urgent stent/nephrostomy if infection with blockage
Home care & pain relief
Comfort & monitoring
- Warm compress on the back; short walks between rests
- Strain urine; note fever, decreased urine, or worsening pain
- Avoid dehydration—small frequent sips
Prevention by stone type
| Stone | Targets | Key steps |
|---|---|---|
| Calcium oxalate | Urine output ≥2–2.5 L/day; ↑ citrate; ↓ sodium; moderate oxalate | Fluids across the day; normal dietary calcium with meals; limit salt; moderate oxalate (spinach, nuts) rather than zero; lemon/lime for citrate |
| Calcium phosphate | Avoid overly alkaline urine; control calcium and sodium | Limit salt; discuss causes of high urine pH; thiazides/citrate only if advised |
| Uric acid | Urine pH ~6.0–6.5; reduce uric acid | Alkalinize urine (potassium citrate if prescribed); limit purine-rich meats; consider allopurinol if high uric acid |
| Struvite | Control infection; remove stone fragments | UTI treatment; urology follow-up to clear stones fully |
| Cystine | Very high urine volume; alkalinize urine | Fluids day and night; medicines (tiopronin) if prescribed; low-sodium diet |
Fluids & diet checklist
Daily goals
- Drink enough to produce pale urine most of the day (aim ≥2–2.5 L urine)
- Spread fluids from morning to evening; add a small glass at bedtime if advised
- Limit salt (cook with less; avoid processed foods)
- Keep normal dietary calcium (not low) with meals unless told otherwise
Smart choices
- Water first; add lemon/lime; moderate tea/coffee; limit sugary sodas
- Balanced plate: vegetables, whole grains, lean protein
- If oxalate sensitive: moderate spinach, beets, nuts, chocolate; pair with calcium foods at that meal
Quick answers
How long does a small stone take to pass?
Often within a few days to weeks, depending on size and location. Keep in touch with your clinician if pain persists.
Do I need to stop calcium?
No—very low calcium can increase oxalate absorption. Keep normal dietary calcium unless your clinician advises otherwise.
Which drink is best?
Water is best; citrus water can boost citrate. Limit sugar-sweetened and very salty drinks.
Can medicines prevent stones?
Yes, for some: thiazides, potassium citrate, allopurinol, or others based on your 24-hour urine and stone type.
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