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Smouldering myeloma: between MGUS and myeloma | CION Cancer Clinics
Smouldering myeloma is a symptom-free stage between MGUS and active myeloma. There are more abnormal plasma cells or more M-protein than in MGUS, but your bones, kidneys, blood and calcium are not yet affected. Most people are watched closely rather than treated. This page explains how it is diagnosed, how it differs from MGUS and myeloma, and what follow-up looks like. 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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The short answer
What is smouldering myeloma?
Smouldering myeloma is a stage between MGUS and active myeloma. There are more abnormal plasma cells or more M-protein than in MGUS, but they are not yet harming your bones, kidneys, blood or calcium level.
Why it usually is not treated straight away
Because nothing is being damaged, most people with smouldering myeloma are watched closely rather than treated. Treatment brings side effects and hospital visits. For someone who may stay stable for years, starting too early can mean living with those effects without a clear gain. The watch is active, with regular blood tests and sometimes scans.
How it differs from MGUS
In MGUS, plasma cells make up less than 10% of the bone marrow and the M-protein is below 30 g/L. Smouldering myeloma is diagnosed when either of those limits is reached or passed, while the organs are still unaffected. The chance of moving on to active myeloma is higher than in MGUS, which is why follow-up is closer.
How it differs from myeloma
Active myeloma means the plasma cells are causing harm. Doctors look for raised calcium, kidney damage, a low haemoglobin and bone damage, or certain very high marrow or light chain results. Any one of these moves the diagnosis to myeloma, and treatment is then discussed.
Reference ranges differ between laboratories. A single result is always read alongside symptoms and repeat tests.One family of conditions
Where does smouldering myeloma sit among the three?
All three start from plasma cells making one protein. What separates them is how much, and whether the body is being harmed.
MGUS
A small amount of protein and few plasma cells. No harm to the body. Most people never go on to anything more. It is common in older adults and is usually found by chance.
What happens
- Blood tests at spaced intervals
- No treatment
Smouldering myeloma
More protein or more plasma cells than MGUS allows. Still no harm to the bones, kidneys or blood. It needs a bone marrow test and imaging to confirm, because blood tests alone cannot rule out hidden bone damage.
What happens
- Closer tests and imaging
- Treatment discussed only if high risk
Active myeloma
The plasma cells are now damaging the body, or have reached levels known to cause damage soon. Symptoms such as bone pain, tiredness or infections are common at this stage, though not everyone has them.
What happens
- Treatment is usually started
- Care planned by a haematology team
Not sure whether this applies to you?
Ask an oncologistGetting to the diagnosis
Which tests confirm smouldering myeloma?
Protein and light chain tests
Blood tests measure the M-protein and the free light chains. A urine test may also measure protein passed in urine.
Bone marrow test
A small sample from the hip bone shows what share of the marrow is plasma cells. This is needed to confirm the diagnosis. The sample is also checked for genetic changes that help judge risk.
Organ checks
Blood counts, calcium and kidney tests confirm that nothing is being harmed yet. These are repeated at each follow-up visit.
Imaging of the bones
A whole-body low-dose CT, MRI or PET-CT looks for bone damage that blood tests cannot show. Plain X-rays miss early changes, so a more sensitive scan is usually preferred.
On your report
What do the words on your report mean?
- Smouldering or asymptomatic myeloma
- Two names for the same thing. Asymptomatic means without symptoms, and without organ damage.
- Clonal plasma cells
- The identical abnormal plasma cells. The marrow report gives their share as a percentage.
- CRAB features
- High calcium, renal (kidney) damage, a low haemoglobin and bone damage. None of these is present in smouldering myeloma.
- Focal lesion
- A spot in a bone seen on MRI. More than one may count as a sign of active myeloma, so it is always discussed.
- Risk group
- A label based on your protein, light chain and marrow results. It shapes how closely you are watched.
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Commonly believed
What do families often get wrong about it?
"It has the word myeloma, so treatment must start now."
Most people with smouldering myeloma are watched, not treated. Early treatment is considered only for some people at high risk, and not everyone gains from it.
"Watching means the doctors are doing nothing."
Watching is a planned approach with regular tests. It is designed to catch change before your bones or kidneys are harmed. Your team decides in advance which result would lead to treatment.
"It will definitely become myeloma within a year or two."
Some people progress within a few years, and others stay stable for a long time. Your risk group gives a much better picture than any general figure.
"Feeling well means it has gone quiet for good."
Smouldering myeloma usually causes no symptoms, even when it is changing. The blood tests, not how you feel, show what is happening.
Being straight with you
What happens next, and what can this page not tell you?
On average, the chance of smouldering myeloma becoming active myeloma is about 1 in 10 each year for the first five years after diagnosis, and lower after that. Your own chance can be well above or below this.
Follow-up is closer than for MGUS
Blood tests are usually repeated every few months at first. Imaging may be repeated if results change or new symptoms appear. If you stay stable, the gap between tests may lengthen.
Who early treatment does not suit
Most people with lower-risk smouldering myeloma do not need treatment. Frail people and those with serious other illnesses may also be better served by watching. For people at high risk, your haematologist may discuss early treatment or a clinical trial.
What this page cannot tell you
It cannot place you in a risk group or tell you whether treatment is right for you. Only your full set of results, read together by a haematologist, can do that.
What to bring to your next appointment
Bring every protein, light chain and marrow report you have, with dates, and any scan reports. Write down new symptoms, however small. Ask which risk group you are in, which result would change the plan, and who to call if something new happens between visits.
Did you know
Smouldering myeloma is often found only because MGUS follow-up picked up a rise in the protein. Keeping those routine tests is how most people learn about the change early, while their bones and kidneys are still healthy.
Questions we are asked
Common questions about smouldering myeloma
Is smouldering myeloma a cancer?
It is an early, symptom-free form of a plasma cell cancer, but it is not causing harm and most people are not treated. It sits between MGUS and active myeloma. Many haematologists describe it as a condition to watch closely rather than one to treat straight away.
Why am I not being treated?
Because nothing is being damaged yet, and many people stay stable for years. Treatment brings side effects, cost and hospital visits. For most people, careful follow-up is the safer choice. If your results suggest a high risk, your haematologist may discuss early treatment with you.
How often will I need blood tests?
Usually every few months at first, which is closer than for MGUS. If your results stay stable, the gap may lengthen. Your haematologist sets the schedule based on your risk group, and will bring a test forward if you develop new symptoms.
Do I need a bone marrow test?
Yes, usually. The share of plasma cells in the marrow is part of how smouldering myeloma is diagnosed and how risk is judged. It also checks for high-risk genetic changes. The test is done with a local anaesthetic, and most people go home the same day.
Which symptoms mean I should call my doctor?
New bone or back pain, unusual tiredness or breathlessness, repeated infections, severe thirst, confusion, passing less urine or frothy urine. Sudden back pain with leg weakness or numbness needs the nearest emergency department the same day.
Can diet or lifestyle stop it progressing?
No diet or supplement has been shown to stop progression. Eating well, staying active, keeping vaccinations up to date and drinking enough water all support your general health. Check with your doctor before taking regular pain medicines or herbal remedies, because some strain the kidneys.
Can I keep working and travelling?
Yes. Smouldering myeloma does not usually limit daily life. Plan travel around your test dates, carry copies of your latest reports, and know how to reach your haematology team if symptoms appear while you are away.
Should I look for a clinical trial?
It is worth asking, especially if you are at high risk. Trials test whether early treatment helps, and they come with close follow-up. Not every trial is open in India. Your haematologist can tell you whether any trial fits your results and where it is being run.
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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
- National Cancer Institute — Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ), Patient Version
- National Cancer Institute — Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ), Health Professional Version
- American Cancer Society — What Is Multiple Myeloma?
- Cancer.Net — Multiple 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.
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