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High calcium in myeloma: the signs that need hospital today | CION Cancer Clinics
Hypercalcaemia in myeloma is an emergency when the person becomes drowsy, confused, keeps vomiting, is very thirsty or passes little urine. Call 108 or go to the nearest emergency department the same day and say "myeloma". It happens because the cancer releases calcium from bone. Hospital treatment with fluids and bone-protecting medicine usually brings it down. This page explains the signs, what doctors do, and what it cannot tell you. At CION Cancer Clinics, our haematology team supports patients and families through treatment, cost questions and life at home.
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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
- What is high calcium in myeloma, and why is it an emergency?
- What does high calcium look like at home?
- What will the emergency team usually do?
- Which words on the report relate to calcium?
- What do families often get wrong about high calcium?
- How can you lower the chance of it happening again?
- Common questions about high calcium in myeloma
!
If this is happening now
If someone with myeloma is suddenly very drowsy, confused, cannot stop vomiting, or is passing very little urine, call 108 or go to the nearest emergency department today. Say the words "myeloma" and "high calcium" at the desk. Carry their latest blood report and medicine list. Do not wait for the next clinic visit, and do not give extra calcium or vitamin D tablets while you wait.
The short answer
What is high calcium in myeloma, and why is it an emergency?
High calcium in the blood, called hypercalcaemia on a report, happens when myeloma breaks down bone faster than the body can rebuild it. The calcium stored in bone leaks into the blood. When the level climbs quickly, it upsets the brain, the kidneys, the gut and the heart rhythm, and it can become dangerous within days.
Why myeloma in particular
Myeloma is a cancer of plasma cells, a kind of white cell that lives in the bone marrow. The cancer cells send signals that switch on the cells which dissolve bone. That is also why myeloma causes bone pain and fractures. High calcium can be the first sign that leads to a myeloma diagnosis, or it can appear later when the disease becomes active again.
Why it gets worse on its own
High calcium makes the kidneys pass more water, so the person becomes dry. Being dry makes the kidneys clear calcium less well, so the level rises further. Vomiting and not drinking add to this. That loop is why a person can seem only a little tired one day and be very confused two days later.
A family member often notices the change before the patient does. Trust that feeling and act on it.Not sure whether this applies to you?
Ask an oncologistWhat to look for
What does high calcium look like at home?
The signs are vague and easy to put down to tiredness, old age or the treatment. It is the combination, and a change from normal, that matters.
Thinking and mood
The earliest sign is often a change in the person rather than a physical complaint.
Watch for
- Unusual sleepiness in the daytime
- Muddled speech or forgetting simple things
- Irritability or low mood that is new
Thirst and passing urine
Great thirst with frequent urination, followed later by very little urine, points to the kidneys struggling.
Very little urine over a day is a reason to go to hospital now.Stomach and bowels
Feeling sick, vomiting, loss of appetite, stomach pain and constipation are common. Vomiting is the one that speeds everything up, because the body loses fluid.
Muscles and heart
Weak muscles, aching bones and a feeling of heaviness in the legs. High calcium can also change the heart rhythm, which may feel like fluttering or skipped beats.
At the hospital
What will the emergency team usually do?
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A blood test for calcium and kidney function
The team checks calcium, usually adjusted for the protein level in the blood, along with the kidney tests and salts. This confirms the problem and shows how much the kidneys are affected.
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Fluids through a drip
Most people are very dry by the time they arrive. Fluid into a vein is the first treatment. It helps the kidneys wash calcium out and often clears the confusion a little.
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A medicine that slows bone breakdown
The doctors often give a drip from a group called bisphosphonates, such as zoledronic acid, or a similar injection. It takes a few days to work fully. The team chooses it and the amount based on kidney function.
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Monitoring
Repeat blood tests, a heart tracing, and a watch on urine output. Some people need steroids or other medicines, and a few need dialysis if the kidneys are badly affected.
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Treating the myeloma itself
The calcium came from the cancer. Once the person is stable, the haematology team looks at starting or changing myeloma treatment so that it does not keep happening.
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On the blood report
Which words on the report relate to calcium?
- Serum calcium
- The amount of calcium in the liquid part of the blood. Reference ranges differ between laboratories, so compare it with the range printed beside it.
- Corrected or adjusted calcium
- Calcium adjusted for the protein albumin. This is usually the figure doctors act on.
- Ionised calcium
- The active part of the calcium, measured directly by some laboratories.
- Creatinine and eGFR
- Measures of how well the kidneys are clearing waste. A rising creatinine alongside high calcium needs quick attention.
- CRAB features
- A shorthand doctors use for myeloma damage: high calcium, kidney trouble, a low haemoglobin and bone damage.
Commonly believed
What do families often get wrong about high calcium?
"He is old and on treatment, so being sleepy and
confused is expected."
New confusion in a person with myeloma is never something to wait out. High calcium is one of the commonest causes, and it is treatable in hospital. Infection and kidney trouble are others. All of them need a doctor the same day.
"Calcium is high, so we should stop milk, curd and
all calcium in food."
The calcium is coming out of the bones, not from the plate. Cutting dairy does very little to the blood level. Stopping calcium or vitamin D tablets is a decision for the treating team, so ask them rather than changing it at home.
"Drinking lots of water at home will fix it."
Drinking well helps prevent it, and your team may ask you to. Once symptoms have started, though, the person usually needs fluid into a vein and medicine to slow bone breakdown. Water alone is not enough, especially when vomiting.
"The calcium came down, so the myeloma is under
control."
Bringing the level down treats the emergency. It does not tell you what the myeloma is doing. Your haematologist decides that from other tests.
Afterwards
How can you lower the chance of it happening again?
Most people who have had high calcium once are kept on a regular bone-protecting medicine and have calcium and kidney tests at every visit. Keeping those visits matters more than anything you do at home.
What helps at home
Drink steadily through the day unless your team has told you to limit fluids. Keep moving within what your bones allow, because lying in bed for days speeds up bone loss. Ask before taking any new tablet, including antacids, calcium supplements and some painkillers that are hard on the kidneys.
Who needs extra care
People with kidneys already damaged by myeloma, older people who drink little, and anyone who has a stomach upset with vomiting are more likely to tip into high calcium quickly. In these situations, call your haematology team early rather than late.
What this page cannot tell you
It cannot tell you whether a particular symptom is from calcium, an infection or something else. Only a blood test can. It also cannot tell you how serious the myeloma is. At CION, Dr. Basudev Pokhrel and the haematology team review each case and discuss it at a tumour board.
Questions we are asked
Common questions about high calcium in myeloma
What calcium level counts as an emergency?
There is no single number that suits every person. Laboratories use different ranges, and doctors weigh how fast the level rose and how unwell the person is. A mildly raised result with no symptoms may be managed in clinic. Any raised calcium with confusion, vomiting or little urine needs hospital the same day.
Can high calcium in myeloma be fatal?
Left untreated, a very high level can damage the kidneys, disturb the heart rhythm and lead to coma. That is why it is treated as an emergency. With prompt fluids and medicine in hospital, most people improve over the following days. How quickly depends on the kidneys and on the myeloma itself.
How long will they keep him in hospital?
It varies. Someone who responds quickly to fluids may go home within a few days. If the kidneys are badly affected, or an infection is also present, the stay can be longer. The team usually wants to see calcium coming down and the person eating and drinking before discharge.
Should we stop the calcium and vitamin D tablets?
Do not decide that at home. Some people with myeloma are prescribed these on purpose to protect bones. When calcium is high, the haematologist may pause them, but that choice depends on your blood results. Bring every tablet strip to the hospital so the doctors can see exactly what is being taken.
Can a local hospital treat this, or must we go to CION?
Go to the nearest emergency department. Any hospital with a proper emergency service can start fluids and check calcium. Tell them it is myeloma, show the reports, and ask them to contact the haematology team. Travelling a long distance while confused and dry adds danger.
Does high calcium mean the myeloma has come back?
It can be a sign that myeloma is active, but not always. Other causes include being dry, some medicines and, rarely, a separate gland problem. The haematologist will look at the paraprotein and light chain tests, and sometimes a scan or marrow test, before saying what the myeloma is doing.
Why is my father confused but his calcium was normal last month?
Calcium can rise within weeks, or even days, when myeloma is active or the person becomes dry. A normal result last month does not rule it out today. Confusion also has other causes, such as infection, low sodium or medicines. He needs a fresh blood test the same day.
Is the drip medicine safe for the kidneys?
Bone-protecting drips can affect the kidneys, so the team checks kidney function first and chooses the medicine and how it is given accordingly. Some people get a different injection instead. Tell the doctors about any past kidney problem and any dental work planned, because jaw health also matters with these medicines.
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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
- Macmillan Cancer Support — Hypercalcaemia
- NHS — Multiple myeloma
- National Cancer Institute — Myeloma
- Blood Cancer UK — Myeloma
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
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Worried about a calcium result?
If the person is unwell now, go to the nearest emergency department first. For a result you want explained, call the helpline and our haematology team will help you understand the next step.