Kidney Stones in the Elderly: Symptoms, Risks & Treatment

Why kidney stones are different in older adults

Kidney stones are increasingly common in people over 65, partly due to longer life expectancy, rising rates of obesity and diabetes, and medications that promote stones. However, stones in the elderly often present differently than in younger adults. Symptoms may be vague or absent, diagnosis is often delayed, and treatment carries higher risks due to comorbidities. At Vivekananda Hospital, we take a geriatric‑friendly approach to stone management – balancing efficacy with safety.

Atypical symptoms – why stones are missed

Classic renal colic (severe flank pain, restlessness, nausea) is less common in the elderly. Instead, older adults may present with:

• Confusion or delirium: The only sign of a stone may be sudden confusion, especially in patients with dementia.
• Non‑specific abdominal discomfort: Dull ache, bloating, or vague pain without the typical colicky pattern.
• Fever without localising signs: Pyelonephritis from an obstructing stone may present as unexplained fever.
• Falls or functional decline: Pain and dehydration can cause weakness and falls.
• Urinary symptoms mimicking UTI: Frequency, urgency, burning – but urine culture may be negative.
• Anorexia or nausea without vomiting: Elderly patients may stop eating without severe pain.

Unique risk factors in the elderly (medications, comorbidities)

Several age‑related factors increase stone risk:

• Dehydration: Reduced thirst sensation, fear of incontinence (avoiding fluids), and poor access to water.
• Medications:
  • Calcium and vitamin D supplements (for osteoporosis) – increase urinary calcium.
  • Loop diuretics (furosemide) – increase urinary calcium.
  • Topiramate (for seizures, neuropathy) – causes hypocitraturia.
  • Allopurinol – paradoxically, may increase oxalate stones in some.
  • Laxative abuse – causes dehydration.
• Comorbidities: Diabetes (uric acid stones), gout, chronic diarrhoea, recurrent UTIs, neurogenic bladder, immobility (bone resorption → hypercalciuria).
• Dietary factors: High sodium (processed foods), low fluid intake, excessive animal protein.
• Immobility: Bedridden patients have bone demineralisation and increased urinary calcium.

Higher risk of complications (infection, kidney damage)

Elderly patients with stones face greater risks:

• Urosepsis: Higher mortality from septic shock. An obstructing infected stone is a urological emergency.
• Acute kidney injury: Dehydration, obstruction, and nephrotoxic medications combine to cause rapid kidney decline.
• Delayed recovery: Longer hospital stays, more post‑operative complications (delirium, pneumonia, pressure sores).
• Fracture risk: Falls from pain or weakness.

Diagnostic challenges and safe imaging

Diagnosing stones in older adults requires balancing accuracy with safety:

• Ultrasound (first‑line): No radiation, detects hydronephrosis and stones >3mm. Good for initial screen, but may miss small ureteral stones.
• Low‑dose CT (preferred if ultrasound inconclusive): Modern low‑dose protocols reduce radiation significantly. The diagnostic yield outweighs the small cancer risk in this age group.
• Plain X‑ray (KUB): Limited use – many stones (uric acid) are radiolucent. May be used for follow‑up.
• Urinalysis: Hematuria, pyuria, pH, crystals. A negative dipstick does not rule out stone.
• Blood tests: Creatinine, calcium, uric acid, electrolytes.

At Vivekananda Hospital, we use ultrasound first. If the patient is at high risk for a stone (e.g., fever, hydronephrosis, high suspicion), we proceed to low‑dose CT without hesitation.

Treatment considerations (conservative vs surgery, anaesthesia risks)

Treatment must be individualised based on stone size, symptoms, frailty, and life expectancy.

Conservative management (small stones <5mm, minimal symptoms)

• Hydration: 2‑2.5 litres daily (adjust for heart failure).
• Pain relief: Paracetamol first‑line. NSAIDs (ibuprofen) with caution – risk of AKI and GI bleeding.
• Medical expulsion therapy: Tamsulosin 0.4 mg daily – safe in elderly, but watch for dizziness and hypotension.
• Antibiotics: If UTI is present.

Surgical treatment (larger stones, obstruction, infection)

• Ureteroscopy (URS) with laser: Preferred for most elderly patients – high success, minimal invasiveness, same‑day or next‑day discharge. Stent placement common. Anaesthesia risk is the main concern – assess with geriatrician.
• ESWL (shock wave lithotripsy): Non‑invasive, but lower success, may require multiple sessions. Avoid in patients with bleeding disorders or on antiplatelets.
• PCNL: For large stones (>2cm). Higher risk of bleeding and prolonged hospital stay – reserved for fit elderly or when no alternative.
• Stent placement (temporary): For frail patients who cannot tolerate definitive surgery – stent bypasses the stone. Requires regular changes.

Prevention tips for seniors and caregivers

Preventing stones in the elderly focuses on hydration and medication management:

• Hydration: Encourage water intake – use a schedule, keep water within reach. Avoid excessive caffeine and alcohol.
• Review medications: Stop unnecessary calcium supplements. Switch loop diuretics to thiazides if appropriate. Adjust antiplatelets before any procedure.
• Dietary advice: Low sodium, moderate animal protein, normal calcium from dairy (not pills). Low oxalate (avoid spinach, nuts).
• Manage comorbidities: Tight glycaemic control in diabetes, treat gout, control blood pressure (avoid thiazides if hypokalaemia).
• Mobility: Encourage walking – reduces bone resorption and improves hydration.
• Regular follow‑up: Annual ultrasound for recurrent stone formers.

Interactive FAQ – Kidney stones in the elderly

Disclaimer: If you are caring for an older adult with possible kidney stone symptoms, seek prompt urological evaluation. At Vivekananda Hospital, we provide geriatric‑friendly care for elderly stone formers.