Clinical Mnemonics · Internal Medicine & Infection
Stones, Bones, Groans, Thrones, Psychiatric Overtones
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In 30 seconds
Lists the classic symptoms of hypercalcemia, organized by the organ systems calcium affects.
The college version
Lists the classic symptoms of hypercalcemia, organized by the organ systems calcium affects.
Stones — Kidney stones (renal calculi)
Hypercalciuria from high serum calcium
High blood calcium causes hypercalciuria, supersaturating the urine so calcium precipitates with oxalate/phosphate into Stones Kidney stones (renal calculi) (the most common stone type), producing renal colic and hematuria.
Physiology. More calcium is delivered to the tubules, and the polyuria of hypercalcemia concentrates the urine, making crystal formation easier.
Safety. Renal colic with fever suggests an obstructed, infected kidney - a urologic emergency.
Bones — Bone pain and fractures
Osteoclastic bone resorption
Excess PTH (hyperparathyroidism) or PTHrP/bony metastases (malignancy) drive osteoclasts to resorb bone, causing bone pain, osteoporosis, and pathologic fractures.
Physiology. PTH and PTHrP activate osteoclasts; excess resorption thins the skeleton and dumps calcium into the blood - the bone loss is the source of the high calcium.
Safety. Pathologic fractures plus hypercalcemia should prompt a search for malignancy or severe hyperparathyroidism.
Groans — GI symptoms (constipation, nausea, abdominal pain)
Depressed smooth-muscle function
Hypercalcemia depresses smooth-muscle and nerve function, causing constipation, anorexia, nausea, vomiting, and abdominal pain (even ileus). It also raises gastric acid (gastrin), so ulcers and pancreatitis can complicate it.
Physiology. High calcium raises the depolarization threshold, reducing gut smooth-muscle contraction; calcium also stimulates gastrin (acid) and can activate trypsinogen (pancreatitis).
Safety. Severe abdominal pain should not be dismissed as just constipation - think pancreatitis, which hypercalcemia can trigger.
Thrones — Polyuria and polydipsia
Nephrogenic diabetes insipidus
Hypercalcemia impairs the kidney's response to ADH (nephrogenic diabetes insipidus), causing polyuria of dilute urine and compensatory polydipsia; dehydration worsens the hypercalcemia.
Physiology. Calcium interferes with ADH signaling and the countercurrent concentrating mechanism, so the collecting duct can't concentrate urine.
Safety. Dehydration worsens hypercalcemia - aggressive rehydration is therapeutic, not just supportive.
Psychiatric Overtones — Depression, anxiety, confusion, lethargy
CNS depression from high calcium
Hypercalcemia causes neuropsychiatric symptoms (depression, anxiety, fatigue, poor concentration, confusion), progressing to stupor or coma at very high levels. A reversible cause of delirium in older adults.
Physiology. Calcium raises the depolarization threshold of neurons, reducing nervous-system excitability and synaptic transmission - the brain 'slows down.'
Safety. Severe hypercalcemia with altered mental status is a hypercalcemic crisis - treat urgently with fluids, calcitonin, and bisphosphonates.
Memory aids
- Stones = Kidney stones (renal calculi)
- Bones Bone pain and fractures = Bone pain and fractures
- Groans GI symptoms (constipation, nausea, abdominal pain) = GI symptoms (constipation, nausea, abdominal pain)
- Thrones Polyuria and polydipsia = Polyuria and polydipsia
- Psychiatric Overtones Depression, anxiety, confusion, lethargy = Depression, anxiety, confusion, lethargy
Quick review
- Stones = Kidney stones (renal calculi) — Hypercalciuria from high serum calcium
- Bones = Bone pain and fractures — Osteoclastic bone resorption
- Groans = GI symptoms (constipation, nausea, abdominal pain) — Depressed smooth-muscle function
- Thrones = Polyuria and polydipsia — Nephrogenic diabetes insipidus
- Psychiatric Overtones = Depression, anxiety, confusion, lethargy — CNS depression from high calcium
Eli explains
The same idea, in plain words
Explain it like I’m 10
A rhyming checklist of how too much calcium makes a person feel sick - kidney stones, sore bones, a grumbly gut, constant peeing, and a foggy brain.
Stones — Kidney stones (renal calculi). Your kidneys filter blood into urine like a water filter. Too much dissolved calcium clumps into little crystals - kidney stones - that can get stuck and hurt.
Bones — Bone pain and fractures. Bones are the body's calcium bank. When something keeps withdrawing calcium from the bank, bones get thin and weak, so they ache and break easily.
Groans — GI symptoms (constipation, nausea, abdominal pain). Calcium acts like a slow-down switch on the muscles that push food through the gut, so food sits still - you feel bloated, nauseated, and constipated.
Thrones — Polyuria and polydipsia. Thrones means toilets - the person is always running to pee and always thirsty because extra calcium makes the kidneys ignore the hormone that concentrates urine.
Psychiatric Overtones — Depression, anxiety, confusion, lethargy. Calcium also slows the brain. Too much makes thinking foggy and mood low - people feel tired, sad, confused, or out of it, and severe cases get very sleepy.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- Stones
- Kidney stones (renal calculi)
- Bones
- Bone pain and fractures
- Groans
- GI symptoms (constipation, nausea, abdominal pain)
- Thrones
- Polyuria and polydipsia
- Psychiatric Overtones
- Depression, anxiety, confusion, lethargy
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