Hypercalcemia
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Hypercalcemia Treatment in Singapore
Hypercalcemia means there is too much calcium in your blood. It is often picked up by chance on a routine blood test or health screening, sometimes before you notice any symptoms at all. Even when the rise is mild, the cause always needs to be identified, because it decides whether you need monitoring, a change in medication or treatment of an underlying condition. At LW Cho Endocrine Clinic, Dr Cho Li Wei assesses high calcium results and guides you through testing and treatment at Gleneagles and Parkway East.
What Is Hypercalcemia?
Calcium is essential for strong bones and teeth, and for your nerves, muscles and heart to work properly. Your body keeps blood calcium within a narrow range, roughly 2.2 to 2.6 mmol/L for adjusted calcium, although the exact reference range varies slightly between laboratories. Hypercalcemia is when the level rises above this range.
Two systems keep calcium in balance. The four small parathyroid glands in your neck release parathyroid hormone (PTH), which raises calcium by releasing it from bone, holding on to it in the kidneys and activating vitamin D. Vitamin D, in turn, helps your gut absorb calcium from food. When either system is overactive, or when calcium is released from bone for another reason, blood calcium climbs.
Common Causes of High Calcium
Primary Hyperparathyroidism
This is the most common cause of high calcium in people who are otherwise well. One or more parathyroid glands, usually because of a small benign growth called an adenoma, produces too much PTH. It is more common in women after menopause.
Medications and Supplements
Thiazide diuretics, often used for high blood pressure, and lithium can raise calcium. Taking high doses of vitamin D or calcium supplements, especially together, can do the same. Treating vitamin D deficiency safely means checking your levels before and during treatment.
Other Medical Conditions
Less commonly, high calcium is caused by cancer that affects bone or produces hormone-like substances, granulomatous diseases such as sarcoidosis or tuberculosis, an overactive thyroid, or prolonged immobilisation after illness or injury. Some people have an inherited condition, familial hypocalciuric hypercalcemia, which usually needs no treatment but must be told apart from hyperparathyroidism.
Symptoms of Hypercalcemia
Many people with mildly raised calcium have no symptoms and only find out from a blood test. When symptoms do appear, they tend to build up gradually and are easy to put down to stress or ageing. They include:
- Increased thirst and frequent urination
- Constipation, nausea or loss of appetite
- Tiredness, weakness and difficulty concentrating
- Low mood or irritability
- Kidney stones
- Bone pain, or thinning bones found on a bone density scan
Higher calcium levels can cause confusion, vomiting, dehydration and abnormal heart rhythms. Because symptoms are vague, a blood test is the only reliable way to know your calcium level.
When to See a Hypercalcemia Doctor
See a hypercalcemia doctor if a blood test or health screening shows raised calcium, even if you feel well, or if a repeat test confirms it is still high. A specialist review is also worthwhile if you have had kidney stones, or if a bone density scan shows low bone density and your calcium is raised. You do not need a referral to book.
If you have very high calcium with confusion, drowsiness, severe vomiting or are unable to keep fluids down, go to a hospital emergency department, as this needs urgent treatment.
How We Diagnose the Cause
Finding the cause is the most important step, and it usually starts with blood and urine tests. Dr Cho may arrange:
- Adjusted and ionised calcium, to confirm the level is truly raised
- Parathyroid hormone (PTH), which separates parathyroid causes from others
- Vitamin D, phosphate and kidney function
- Urine calcium, to assess kidney stone risk and rule out familial hypocalciuric hypercalcemia
- Neck ultrasound and a parathyroid scan, to locate an overactive gland if surgery is being considered
- DXA bone density scan, to see whether high calcium has affected your bones
Not everyone needs every test. Dr Cho will explain why each one is being ordered and go through the results with you, so you understand the cause and your options before any treatment begins.
Treatment for Hypercalcemia in Singapore
Treatment depends on the cause, how high your calcium is and whether it is affecting your bones or kidneys.
Treating the Underlying Cause
Where a medication or supplement is responsible, it may be adjusted, reduced or stopped, with an alternative found where needed. If another condition is driving the high calcium, treating that condition usually brings calcium back down.
Monitoring for Mild Cases
Mild primary hyperparathyroidism without kidney or bone complications can often be safely monitored. This involves regular blood tests, periodic bone density scans and kidney checks, along with staying well hydrated and avoiding excess calcium and vitamin D supplements.
Medication
When surgery is not suitable or not wanted, medication can help. Cinacalcet lowers PTH and calcium levels, and bone-strengthening treatments such as bisphosphonates or denosumab may be used to protect bone density. Low vitamin D levels are corrected carefully.
Parathyroid Surgery and Specialist Referral
Surgery to remove the overactive parathyroid gland is the only cure for primary hyperparathyroidism. It is usually recommended if calcium is significantly raised, if you have kidney stones, reduced kidney function or osteoporosis, or if you are younger. Dr Cho works with experienced endocrine surgeons, coordinates the scans needed before surgery and follows you up afterwards.
Read more about our osteoporosis and calcium disorders treatment, including how we protect your bone health.
Why See Dr Cho Li Wei for Hypercalcemia
Dr Cho Li Wei is a consultant endocrinologist with over 20 years of experience, accredited as a specialist in both the United Kingdom and Singapore. Calcium and bone disorders, including hypercalcemia, hyperparathyroidism, osteoporosis and vitamin D disorders, are among her core areas of practice. Every consultation is with Dr Cho herself, from your first assessment through testing, treatment and follow-up.
MB ChB (Glasgow), FRCP (London), MD (UK), MPH (Hong Kong), FAMS (Endocrinology)
You shouldn’t have to compromise a full, active life because of your endocrine health. At LW Cho Endocrine Clinic, our specialised team is ready to manage hormonal issues and calcium, parathyroid and bone conditions with care, precision, and understanding.
Hypercalcemia FAQ
A single slightly high reading is not usually an emergency, and it is sometimes caused by dehydration or how the sample was taken. However, calcium that stays raised over months or years can lead to kidney stones, reduced kidney function and bone loss, often without symptoms. That is why the result should be repeated and the cause found, even if you feel well.
Yes, especially at high doses or when both are taken together for a long time. Vitamin D toxicity is uncommon but does happen, usually from high-dose supplements taken without monitoring. If you take supplements, bring them to your appointment so Dr Cho can review the doses. Do not stop prescribed treatment without speaking to your doctor first.
Not always. Surgery is recommended when calcium is significantly raised, when there are complications such as kidney stones, reduced kidney function or osteoporosis, or for younger patients. Many people with mild disease are safely monitored instead. Dr Cho will discuss the benefits and risks of each option with you and, if surgery is advised, refer you to an experienced endocrine surgeon.
When PTH is too high, calcium is drawn out of your bones, which can thin them and raise your risk of fractures. The extra calcium is filtered by your kidneys, which can lead to kidney stones and, over time, reduced kidney function. Bone density scans and kidney checks help detect these effects early, often before symptoms appear.
No. You can book an appointment with Dr Cho directly. Some insurance plans require a GP referral for claims, so please check with our clinic team if you plan to use corporate insurance. Bring any previous blood test results, as they help show how your calcium has changed over time.
