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Hypercalcaemia in myeloma: when high calcium is an emergency | CION Cancer Clinics
High calcium in myeloma is an emergency: if someone is confused, very drowsy, vomiting or extremely thirsty, go to the nearest emergency department today or call 108. Myeloma releases calcium from bone, and it is very treatable with fluids through a drip and bone-protecting medicine. This page lists the early signs families miss, what happens in hospital and how to lower the chance of it returning. At CION Cancer Clinics, our haematology team plans myeloma and lymphoma care with you, discussed at a tumour board and explained in plain words.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Why is high calcium in myeloma an emergency?
- What are the symptoms of high calcium?
- What happens once you reach hospital?
- How do early and severe high calcium differ?
- What beliefs delay treatment for high calcium?
- How can you lower the chance of it happening again?
- Common questions about high calcium in myeloma
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What to do now
If a person with myeloma is confused, very drowsy, extremely thirsty, vomiting, or suddenly much weaker than usual, go to the nearest emergency department today or call 108. Say they have myeloma and ask for their calcium to be checked. Do not wait for the next clinic visit, and do not treat it at home with extra water alone.
The short answer
Why is high calcium in myeloma an emergency?
High calcium in the blood, called hypercalcaemia, affects the brain, the kidneys, the gut and the heart all at once. It can worsen within a day or two, and it is very treatable when caught, which is why hospital care should not be delayed.
Where the calcium comes from
Myeloma cells send signals that make bone break down faster than it is rebuilt. The calcium stored in that bone spills into the blood. Bed rest, because of bone pain, speeds this up, since bones that carry no weight lose calcium more quickly.
Why it snowballs
High calcium makes the kidneys pass more urine. You lose fluid, feel sick and stop drinking, so you become drier still. Dry kidneys clear calcium less well, and the level climbs further. Breaking this cycle needs fluids through a drip and medicines that stop bone losing calcium, which is hospital care.
Who is most at risk
People at diagnosis, people whose myeloma has come back, people with many bone lesions, and anyone with kidney damage or a recent illness with vomiting or loose motions.
What to take with you to the emergency department
Carry the most recent blood reports, the discharge summary or clinic letter that names the myeloma, and every medicine and supplement in its strip or bottle. Note when the confusion, thirst or vomiting started. These details let the emergency doctor act in minutes rather than hours, especially at night when your usual team is not there.
Not sure whether this applies to you?
Ask an oncologistWhat you may notice
What are the symptoms of high calcium?
They creep up and are easy to blame on myeloma, on painkillers or on age. Families often notice the change in behaviour before the patient does.
Thirst and urine
Strong thirst that water does not settle, and passing urine more often, including at night. Later, as the body dries out, the amount of urine can fall and the mouth feels dry.
Stomach and appetite
Feeling sick, vomiting, loss of appetite, stomach pain and constipation that is new or much worse. Pain medicines can cause some of this too, so do not assume it is only the tablets.
Mind and mood
Confusion, forgetfulness, sleepiness, irritability or low mood. A parent who is "not themselves" is a real warning sign.
Easy to mistake for
- Side effects of pain medicines
- Tiredness from treatment
- Old age
Muscles, bones and heart
Muscle weakness, more bone pain, and occasionally a racing or irregular heartbeat. An irregular heartbeat needs emergency care.
At the hospital
What happens once you reach hospital?
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Blood tests and a heart tracing
Calcium is measured and corrected for the protein level, alongside kidney function and salts. An ECG, a heart tracing, checks the rhythm. Reference ranges differ between laboratories, so the team reads the result with your symptoms.
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Fluids through a drip
This is usually the first treatment. It rehydrates you and helps the kidneys clear calcium. The amount is judged against your heart and kidney function.
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A medicine to protect bone
Zoledronic acid, given as a drip, or denosumab, given as an injection, slows the bone breakdown that is releasing calcium. It takes a few days to reach its full effect.
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Faster-acting help if needed
Steroids and a hormone called calcitonin can bring calcium down in the meantime. Dialysis is occasionally used when the kidneys cannot cope.
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Treating the myeloma
Calcium stays controlled only when the myeloma is controlled, so myeloma treatment starts or is changed once you are stable.
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How do early and severe high calcium differ?
Earlier, easily missed
Severe, needs emergency care
More thirsty than usual, passing more urine
Very little urine, dry mouth, dizzy on standing
Off food, a little constipated
Repeated vomiting, unable to keep fluids down
Tired, low mood, slower than usual
Confused, hard to wake, talking nonsense
Aching muscles, a bit weaker
Cannot stand, racing or irregular heartbeat
Commonly believed
What beliefs delay treatment for high calcium?
"He is just confused because he is old and tired."
New confusion in someone with myeloma should always be checked the same day. High calcium is one of the commonest causes, and the confusion usually clears once the calcium comes down.
"We should stop milk, curd and calcium in food."
The extra calcium comes from bone, not from food. Cutting out dairy does not treat it and can weaken nutrition at a difficult time. Ask the team before changing the diet, and do not stop any prescribed supplement on your own.
"Drinking a lot of water at home will fix it."
Drinking well helps prevent it, but once symptoms are present, a drip and bone-protecting medicine are usually needed. Someone who is vomiting or drowsy cannot drink enough safely.
"Once it is treated, it will not come back."
It can return if the myeloma becomes active again. Knowing the early signs means you can act at the first hint rather than at the crisis.
Afterwards
How can you lower the chance of it happening again?
Keep myeloma treatment on schedule, keep drinking fluids through the day, and keep moving as much as bone pain allows. Watch for the early signs above and report them early rather than late.
Bone-protecting injections
Many people with myeloma are offered zoledronic acid or denosumab on a regular schedule. These lower the chance of fractures and of high calcium. They need a dental check first, because rarely they can damage the jaw bone. They do not suit everyone: kidney function, dental health and blood calcium all affect the choice, and your team sets the plan.
Medicines and supplements
Some medicines, such as certain water tablets, and supplements containing vitamin D or calcium, can affect calcium levels. Bring every tablet and powder to your clinic visit, and let the team decide what stays.
What this page cannot tell you
It cannot tell you whether a symptom is caused by calcium or by something else, such as infection or a medicine. Only a blood test can answer that, which is why the advice is to get checked rather than to guess.
Questions we are asked
Common questions about high calcium in myeloma
Can high calcium from myeloma be life-threatening?
Yes, when it is severe and untreated. It can cause kidney failure, heart rhythm problems and loss of consciousness. The encouraging part is that treatment in hospital usually brings it down within days. The danger lies in delay, so any confusion, repeated vomiting or extreme drowsiness needs emergency care.
What is "corrected calcium" on the report?
Much of the calcium in blood is carried on a protein called albumin. When albumin is low, the total calcium can look normal even when the active part is high. Corrected calcium adjusts for that. Reference ranges differ between laboratories, so ask your team what your own figure means.
How long will my mother stay in hospital?
It depends on how high the calcium was, how the kidneys respond and whether myeloma treatment is started during the stay. Many people feel clearer within a few days of fluids and bone-protecting medicine. The team will usually want calcium and kidney function steady before discharge.
Can high calcium be the first sign of myeloma?
Yes. Some people are found to have myeloma only after a blood test for thirst, confusion or constipation shows high calcium. High calcium has other causes too, so further tests, such as protein studies of blood and urine, are needed before anyone can say it is myeloma.
Is the confusion permanent?
Usually not. Confusion caused by high calcium generally improves as the level falls, though it may take a few days and older people can take longer. If confusion does not lift, the team will look for other causes, such as infection, low sodium or medicines.
Can we give fluids at home instead?
Not once symptoms are present. The drip is only part of the treatment, and the rest needs blood monitoring and medicines given in hospital. At home, the aim is prevention: drink steadily through the day unless your team has set a fluid limit.
Does the bone injection hurt the kidneys?
Zoledronic acid is cleared by the kidneys, so kidney function is checked before each dose and the plan is adjusted if needed. Denosumab is sometimes chosen when kidneys are weak, but it can cause calcium to drop too low. Your team chooses between them.
Who should we call at night?
For confusion, drowsiness, fainting or repeated vomiting, go straight to the nearest emergency department or call 108, whatever the hour. For milder worries, call your treating team or the CION helpline and describe exactly what has changed.
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- Cancer Research UK — Physical effects of cancer, including high calcium
- Macmillan Cancer Support — Impacts of cancer: high calcium levels
- NHS — Multiple myeloma
- National Cancer Institute — Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ), Patient Version
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Zoledronic Acid and Denosumab in MyelomaThe injections that protect bone and lower calciumKidney Failure at Myeloma DiagnosisHigh calcium and kidney damage often come togetherBone Disease in Myeloma: Fractures and Bone PainWhy myeloma weakens bone in the first placeMultiple MyelomaThe full guide to myeloma
Talk to us
Worried about a calcium result after myeloma?
If there is confusion or vomiting, go to an emergency department first. For everything else, tell us what has been found and CION's haematology team will help you with the next step.