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Health condition · Clinically reviewed

Hypercalcaemia, causes, PTH-led diagnosis and modern endocrine treatment.

A raised blood calcium is more than a number. It signals something to find - and, in the right hands, is very treatable.

Jump to treatment
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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, Society for Endocrinology and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK endocrine practice including PTH-based diagnostics, bisphosphonates and denosumab.

Key facts

Hypercalcaemia at a glance.

The essentials, in plain English - what it is, what causes it, and how UK endocrine teams put it right.

  • What it is

    A raised serum calcium, adjusted for albumin, above 2.6 mmol/L. Ionised calcium is the gold standard when in doubt.

  • Severity bands

    Mild 2.6 to 3.0, moderate 3.0 to 3.5, and severe above 3.5 mmol/L, which is a medical emergency.

  • Top two causes

    Primary hyperparathyroidism and malignancy account for around 90 per cent of cases between them.

  • PTH is the key

    A PTH level, read alongside the calcium, splits diagnosis into PTH-dependent and PTH-independent groups.

  • Classic symptoms

    Stones, bones, groans and psychiatric moans, plus polyuria, thirst and constipation.

  • Definitive fix

    Parathyroidectomy for confirmed primary hyperparathyroidism. Cinacalcet, denosumab and bisphosphonates for the rest.

Why this guide matters

One number, many stories.

A raised calcium can mean a benign parathyroid adenoma or a serious cancer signal. The three points below shape everything else on this page.

  • PTH tells the story

    A parathyroid hormone level read alongside the calcium splits the diagnosis into two clean camps - and points to the right next test.

  • Severity drives the setting

    Mild disease is worked up in clinic. Moderate to severe hypercalcaemia is a hospital job - IV fluids come first, always.

  • A cure is often possible

    Parathyroidectomy for primary hyperparathyroidism is a curative operation in the right hands. For other causes, the cause itself is treated.

How the diagnosis is made

From a raised calcium to a clear plan.

The steps a UK GP or endocrinologist will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    History and medications

    A structured look at symptoms, family history, calcium and vitamin D supplements, thiazides and lithium.

  2. 02

    Assessing

    Confirm the calcium

    Repeat serum calcium, adjusted for albumin. Ionised calcium if the result is borderline or the albumin is abnormal.

  3. 03

    Assessing

    Screen for malignancy features

    Weight loss, bone pain, breast, lung, renal or haematological red flags direct the workup.

  4. 04

    Confirming

    Full endocrine bloods

    PTH, phosphate, ALP, magnesium, vitamin D, U and Es, plus a 24-hour urinary calcium excretion.

  5. 05

    Confirming

    Split by PTH

    PTH raised or inappropriately normal points to primary hyperparathyroidism, FHH or tertiary disease. A suppressed PTH points to malignancy, granulomatous disease or medications.

  6. 06

    Planning

    Imaging when indicated

    Neck ultrasound and sestamibi scan to localise a parathyroid adenoma. See our guides to a private CT scan and private MRI scan for wider staging.

  7. 07

    Planning

    Endocrine MDT plan

    A specialist endocrinologist agrees the medical or surgical plan and, where relevant, refers to endocrine surgery.

Typical timeline: a first raised calcium to a settled diagnosis in weeks, not months.

Symptoms

Stones, bones, groans and moans.

Mild disease is often silent. Moderate to severe disease shows itself through the kidneys, gut, bones, brain and heart.

  • Polyuria and thirst

    Calcium impairs the concentrating ability of the kidney - drinking and passing urine more than usual is common.

  • Renal stones

    "Stones" - hypercalciuria over time forms calcium oxalate or phosphate stones, sometimes the first clue.

  • Bone pain and fractures

    "Bones" - osteitis, fragility fractures and, rarely, brown tumours in longstanding hyperparathyroidism.

  • Abdominal symptoms

    "Groans" - nausea, vomiting, constipation, anorexia, peptic ulcer and, occasionally, acute pancreatitis.

  • Neuropsychiatric change

    "Psychiatric moans" - fatigue, low mood, poor concentration, confusion and, when severe, drowsiness and coma.

  • Cardiac features

    A shortened QT interval on the ECG, arrhythmia and, at very high levels, cardiac arrest.

  • Dehydration

    Volume depletion is almost universal in moderate to severe cases and worsens the calcium in a vicious circle.

  • Red flag - severe or acute

    A calcium above 3.5 mmol/L, drowsiness, arrhythmia or reduced consciousness is an emergency needing hospital care.

Treatment

How hypercalcaemia is treated in the UK.

IV fluids first, bisphosphonates and denosumab for the acute rise, then a definitive plan aimed at the cause - often parathyroidectomy or the cinacalcet clinic.

  • IV fluids first

    Isotonic saline to restore volume and increase urinary calcium excretion - the foundation of acute management.

  • Zoledronate or pamidronate

    IV bisphosphonates reduce osteoclastic bone resorption and lower calcium over 2 to 4 days in moderate to severe cases.

  • Denosumab

    A RANK-ligand inhibitor used when bisphosphonates fail, in renal impairment, or in refractory malignancy-associated cases.

  • Calcitonin

    A short-term adjunct that lowers calcium within hours - useful while bisphosphonates take effect.

  • Corticosteroids

    First line for granulomatous causes such as sarcoidosis and for 1,25-vitamin D-driven lymphomas.

  • Parathyroidectomy

    The definitive cure for primary hyperparathyroidism - see our guide to parathyroidectomy for what to expect.

  • Cinacalcet

    A calcimimetic used when surgery is not appropriate, in parathyroid carcinoma, or in tertiary disease - see our cinacalcet clinic.

  • Stop the culprit

    Review thiazides, lithium, calcium and vitamin D preparations. Dialysis is reserved for severe cases with renal failure.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or endocrinologist knows your bloods and history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Hyperparathyroidism (primary): diagnosis, assessment and initial management (NG132).

  • Society for Endocrinology. Endocrine emergency guidance on acute hypercalcaemia.

  • British Association of Endocrine and Thyroid Surgeons (BAETS). Standards for parathyroid surgery.

  • European Society of Endocrinology. Clinical practice guideline on hypercalcaemia of malignancy.

Red flags

When hypercalcaemia needs urgent attention.

Most mild cases are worked up in clinic. These situations aren’t - and are where a specialist opinion, or A&E, is needed.

  • Severe hypercalcaemia

    A serum calcium above 3.5 mmol/L, or symptoms of confusion, drowsiness or arrhythmia at any level, needs same-day hospital assessment.

  • Reduced consciousness

    Drowsiness or coma with a high calcium is an endocrine emergency - call 999 or go to A&E.

  • Cardiac arrhythmia or short QT

    ECG changes with hypercalcaemia require continuous monitoring and urgent correction.

  • Suspected malignancy

    Unintended weight loss, bone pain, night sweats or a rapidly rising calcium needs urgent workup and specialist input.

  • Acute pancreatitis

    Severe abdominal pain with a raised amylase or lipase alongside hypercalcaemia is a surgical emergency.

  • Severe dehydration

    Reduced urine output, dizziness or postural drops warrant IV rehydration in hospital, not oral fluids at home.

  • Refractory or recurrent disease

    A calcium that does not fall despite fluids and bisphosphonates, or that quickly rebounds, needs denosumab and specialist review.

  • Pregnancy

    Hypercalcaemia in pregnancy risks both mother and baby - it needs joint endocrine and obstetric care from the outset.

  • Family clustering

    A family history of hypercalcaemia, pituitary or pancreatic tumours suggests MEN1 or MEN2A and warrants genetic counselling.

Living with it

A treatable condition, with a clear ladder.

Four things that make the biggest difference day to day - steady hydration, a sensible calcium intake, a review of your medicines and regular follow-up.

A quiet reminder

Small habits, kept up for months, do a lot.

Consistent hydration and clear communication with your endocrine team beats a burst of effort that doesn’t last.

  1. 01 Hydration

    Drink to a plan

    Two to three litres of water a day for most people helps the kidneys clear calcium and reduces stone risk.

  2. 02 Diet

    Do not slash calcium blindly

    A very low calcium diet can worsen bone loss - your endocrinologist will set the right intake for your cause.

  3. 03 Meds

    Know your triggers

    Thiazide diuretics, lithium and high-dose vitamin D can all push calcium up. Review new prescriptions with your team.

  4. 04 Follow-up

    Watch your calcium

    Regular calcium, PTH, kidney function and DEXA scans keep an eye on bone health and disease progression.

Frequently asked

Everything we get asked about hypercalcaemia.

Quick answers on causes, PTH, IV treatment and parathyroid surgery.

  • What counts as hypercalcaemia?

    An adjusted serum calcium above 2.6 mmol/L. Mild disease sits between 2.6 and 3.0, moderate between 3.0 and 3.5, and severe above 3.5 mmol/L, which is an emergency. In borderline cases an ionised calcium gives a truer picture, especially when the albumin is abnormal.

  • What are the main causes?

    Around 90 per cent of cases are due to either primary hyperparathyroidism, most often from a single parathyroid adenoma, or malignancy through PTHrP, bone metastases or a haematological cancer. Rarer causes include tertiary hyperparathyroidism in chronic kidney disease, sarcoidosis and other granulomatous conditions, thiazides, lithium, high-dose vitamin D, milk-alkali syndrome, familial hypocalciuric hypercalcaemia (FHH), MEN1, MEN2A and prolonged immobilisation.

  • What symptoms should I look out for?

    The classic phrase is "stones, bones, groans and psychiatric moans" - kidney stones, bone pain, abdominal symptoms like constipation, nausea and pancreatitis, and neuropsychiatric change including low mood, poor concentration and, when severe, confusion or coma. Thirst, polyuria, dehydration and cardiac arrhythmia are also important.

  • How is the cause worked out?

    A PTH level read alongside the calcium is the pivot. A raised or inappropriately normal PTH points to primary hyperparathyroidism, FHH or tertiary disease and is followed by a 24-hour urinary calcium, neck ultrasound and sestamibi scan. A suppressed PTH points to malignancy, granulomatous disease or medications and directs a wider workup led by a specialist endocrinologist.

  • How is severe hypercalcaemia treated in hospital?

    Intravenous saline restores volume and helps the kidneys excrete calcium. An IV bisphosphonate such as zoledronate or pamidronate lowers calcium over two to four days, with calcitonin as a fast-acting adjunct. Denosumab is used when bisphosphonates fail or in renal impairment, and dialysis is reserved for severe cases with kidney failure. The underlying cause is treated in parallel.

  • When is parathyroid surgery the right answer?

    For symptomatic primary hyperparathyroidism, or asymptomatic disease with a high calcium, kidney stones, reduced bone density or reduced kidney function, parathyroidectomy is the definitive cure and is highly successful in experienced hands. Cinacalcet is offered when surgery is not appropriate, for parathyroid carcinoma, or in tertiary hyperparathyroidism where surgery is not planned yet.

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