Multiple Myeloma Symptoms: What They Mean and How It Is Diagnosed
Multiple myeloma is a cancer that begins in plasma cells, a type of white blood cell found mainly in the bone marrow. Plasma cells normally produce antibodies that help the immune system respond to infections. In multiple myeloma, abnormal plasma cells multiply and accumulate in the bone marrow.
The effects of this abnormal growth can extend beyond the bone marrow. Myeloma can weaken bones, reduce the production of normal blood cells, increase the amount of abnormal protein in the blood or urine, raise blood calcium levels and sometimes damage the kidneys.
One important point is that multiple myeloma does not have one specific symptom that identifies it. Bone pain, fatigue, anemia, infections or abnormal kidney tests can occur for many different reasons. Diagnosis requires appropriate medical testing rather than symptoms alone.
What Is Multiple Myeloma?
Multiple myeloma is also called plasma-cell myeloma. It develops when abnormal plasma cells accumulate in the bone marrow.
Normally, plasma cells are part of the immune system. They produce antibodies that help recognize and respond to infections. Myeloma cells are abnormal and can produce an abnormal immunoglobulin or part of an antibody, often referred to as an M protein or monoclonal protein.
As myeloma cells increase, they can interfere with normal bone-marrow function and affect the surrounding bone.
This can produce several major problems:
fewer healthy red blood cells, causing anemia
reduced production of some white blood cells, increasing infection risk
reduced platelet production in some people, increasing bleeding or bruising risk
weakening or destruction of bone
increased blood calcium
kidney injury associated with the disease and its abnormal proteins
Not everyone with multiple myeloma has all of these problems, and some people initially have few or no symptoms.
Why Can Multiple Myeloma Affect So Many Parts of the Body?
The bone marrow is not simply a storage space for blood. It is where many blood cells are produced.
When abnormal plasma cells occupy increasing amounts of marrow, normal blood-cell production can be affected. At the same time, myeloma-related changes in bone can cause areas of bone destruction and release calcium into the bloodstream.
Myeloma proteins can also contribute to kidney injury.
This explains why the disease may produce symptoms involving several apparently unrelated systems.
The important relationship is:
abnormal plasma cells → bone-marrow and bone involvement → blood, bone, calcium and kidney complications.
Bone Pain and Bone Weakness
Bone problems are among the better-known manifestations of multiple myeloma.
Pain can occur in several areas, particularly the:
back
ribs
hips
skull
other affected bones
The pain is not simply because the cancer is "inside the bones." Myeloma can alter normal bone-remodelling processes and produce areas where bone becomes weaker.
Some people develop fractures after relatively minor stress or injury.
Persistent or unexplained bone pain does not mean a person has multiple myeloma. Back pain, for example, is extremely common and has many causes.
However, persistent bone pain combined with unexplained anemia, abnormal kidney tests, high calcium, recurrent infections or other concerning findings may lead a doctor to investigate further.
Anemia and Persistent Fatigue
The bone marrow normally produces red blood cells. When myeloma cells occupy the marrow, normal blood-cell production may be reduced.
This can result in anemia, meaning there are too few healthy red blood cells or too little hemoglobin to carry oxygen efficiently.
Anemia may cause:
unusual tiredness
weakness
shortness of breath, especially with activity
dizziness
reduced exercise tolerance
paleness in some people
Fatigue is not specific to multiple myeloma. It can result from anemia caused by nutritional deficiencies, chronic disease, bleeding, kidney problems and many other conditions.
For this reason, fatigue alone cannot be used to identify myeloma.
A complete blood count can help determine whether anemia or another blood-count abnormality is present.
High Calcium Levels
Bone damage can release calcium into the bloodstream. When the blood calcium level becomes abnormally high, the condition is called hypercalcemia.
Possible symptoms include:
excessive thirst
frequent urination
dehydration
constipation
nausea or vomiting
abdominal discomfort
weakness
loss of appetite
confusion or unusual drowsiness
Significant hypercalcemia can become serious and may affect the kidneys, nervous system, muscles and other organs.
Therefore, symptoms such as severe confusion, marked weakness, repeated vomiting or significant dehydration require medical attention rather than self-treatment.
Kidney Problems
Kidney involvement is an important complication of multiple myeloma.
Abnormal proteins produced by myeloma cells can contribute to kidney damage. High calcium levels and other disease-related mechanisms can also affect kidney function.
Early kidney impairment may produce few obvious symptoms. This is one reason blood and urine testing can be important when myeloma is suspected.
As kidney function worsens, symptoms may include:
weakness
tiredness
swelling of the legs
shortness of breath from fluid accumulation
changes related to the buildup of waste products
Kidney problems are not specific to myeloma. Diabetes, high blood pressure, medications, dehydration, infections and many other disorders can affect kidney function.
An abnormal creatinine or other kidney test therefore requires interpretation in context.
Recurrent Infections
Abnormal plasma cells can interfere with normal immune function.
Some people with multiple myeloma become more susceptible to infections, including respiratory infections.
Frequent or unusually severe infections should not automatically be interpreted as cancer. They can have many causes, including other immune disorders, medications and chronic medical conditions.
However, recurrent infections together with abnormal blood counts or other findings may be part of a pattern that prompts additional investigation.
Bruising or Bleeding
Myeloma can sometimes reduce platelet production if the normal bone marrow becomes significantly affected.
Low platelet levels can make bruising or bleeding more likely.
Possible signs include:
frequent unexplained bruises
prolonged bleeding from minor injuries
nosebleeds
bleeding from the gums
small red or purple spots caused by bleeding under the skin
These symptoms have many possible causes. They should not be interpreted as evidence of multiple myeloma without appropriate evaluation.
Numbness, Weakness and Spinal Problems
Myeloma can weaken the bones of the spine.
In some cases, a weakened vertebra can collapse and put pressure on nerves or the spinal cord.
This can cause:
severe or sudden back pain
numbness
weakness in the legs
difficulty walking
changes in sensation
Sudden severe back pain accompanied by new leg weakness or numbness is an urgent medical problem.
Such symptoms require prompt medical evaluation because spinal cord compression can cause permanent neurological damage if not addressed quickly.
Myeloma can also be associated with peripheral nerve problems in some circumstances, producing tingling, numbness or weakness.
What About Skin Changes?
The previous version of this article presented red spots, dark spots, lip discoloration and itching as typical early signs of multiple myeloma.
That presentation should be removed.
These are not reliable general warning signs of multiple myeloma.
Certain plasma-cell disorders and associated conditions, including some forms of amyloidosis, can produce skin or other tissue changes. But that is different from saying that ordinary rashes or skin discoloration are typical early signs of multiple myeloma.
A persistent rash, itching or skin discoloration should be evaluated according to its own clinical features rather than being assumed to indicate myeloma.
How Is Multiple Myeloma Diagnosed?
Symptoms alone cannot diagnose multiple myeloma.
When a doctor suspects the condition, the evaluation may include several types of tests.
Blood tests
A complete blood count can look for anemia and abnormalities in other blood-cell types.
Blood chemistry testing may evaluate:
calcium
creatinine and kidney function
albumin
other relevant biochemical measurements
Special protein tests can look for abnormal monoclonal proteins.
These may include:
serum protein electrophoresis
immunofixation
quantitative immunoglobulin testing
serum free-light-chain testing
The precise combination of tests depends on the clinical situation.
Urine tests
Some myeloma-related proteins or light chains can be detected in urine.
Urine testing can therefore provide additional information when a plasma-cell disorder is suspected.
Imaging
Imaging may be used to identify bone damage or other areas affected by the disease.
Depending on the situation, doctors may use techniques such as:
CT
MRI
PET/CT
other appropriate skeletal imaging
The purpose is not simply to "look for cancer everywhere." Imaging helps doctors evaluate whether there are bone lesions or other findings relevant to diagnosis and disease assessment.
Bone-marrow examination
A bone-marrow biopsy and aspiration may be needed to determine how many abnormal plasma cells are present and to characterize the disease.
The diagnosis is based on the overall clinical and laboratory picture rather than on one symptom or one blood test.
MGUS, Smoldering Myeloma and Multiple Myeloma Are Not the Same
One important distinction is that not every abnormal plasma-cell finding means active multiple myeloma.
MGUS
Monoclonal gammopathy of undetermined significance (MGUS) involves an abnormal monoclonal protein but does not meet the criteria for multiple myeloma or another related cancer.
MGUS is not itself multiple myeloma, although some people with MGUS can later develop a related disorder.
Smoldering multiple myeloma
Smoldering multiple myeloma is an asymptomatic plasma-cell condition with greater abnormalities than MGUS but without the findings that define active myeloma requiring treatment.
People with smoldering disease may be monitored closely rather than immediately receiving treatment, depending on their individual circumstances.
Active multiple myeloma
Active multiple myeloma involves evidence that the abnormal plasma-cell disorder is causing significant disease or has reached established diagnostic thresholds associated with organ damage or a high risk of imminent organ damage.
This distinction is important because an abnormal protein on a blood test does not automatically mean that a person has active cancer.
Who Is at Higher Risk?
Multiple myeloma becomes more common with increasing age.
Certain factors have been associated with a higher risk, including:
older age
male sex
a personal history of MGUS or certain other plasma-cell disorders
some patterns of family history
certain previous exposures
The exact cause of most cases remains unknown.
Having a risk factor does not mean that someone will develop multiple myeloma.
Can Multiple Myeloma Be Prevented or Screened For?
There is no established lifestyle method that can reliably prevent most cases of multiple myeloma.
It is therefore misleading to suggest that a particular food, supplement, detox program or routine health practice can prevent the disease.
There are also no recommended routine screening tests for multiple myeloma in most people who have no symptoms. The disease can sometimes be discovered incidentally when blood tests performed for another reason show an abnormal protein or other finding.
People who already have conditions such as MGUS may undergo periodic monitoring because their risk is different from that of the general population.
When Should Someone Seek Medical Evaluation?
A single symptom rarely identifies multiple myeloma.
Medical evaluation is more appropriate when symptoms are persistent, unexplained, worsening or occur in combination.
Examples include:
persistent unexplained bone pain
repeated fractures
unexplained anemia or persistent fatigue
recurrent or unusually severe infections
unexplained abnormal calcium levels
unexplained kidney-function abnormalities
persistent weakness
unexplained bruising or bleeding
a blood or urine test showing an abnormal monoclonal protein
The appropriate next step is not to assume that these findings mean cancer. A healthcare professional can determine whether additional testing is justified.
When Is Urgent Care Appropriate?
Some complications require prompt attention regardless of their underlying cause.
Seek urgent medical care for symptoms such as:
sudden severe back pain with leg weakness or numbness
new difficulty walking associated with neurological symptoms
severe confusion
marked weakness with severe thirst or dehydration
significant breathing difficulty
serious or uncontrolled bleeding
These symptoms can have causes other than multiple myeloma, but they should not be ignored.
The Main Point About Multiple Myeloma Symptoms
Multiple myeloma is best understood as a disease of abnormal plasma cells that can affect several systems because those cells accumulate in bone marrow, alter bone metabolism, interfere with normal blood-cell production and produce abnormal proteins.
The most important symptoms and complications include bone problems, anemia, recurrent infections, high calcium, kidney impairment and certain neurological problems.
But none of these findings, by itself, proves that someone has multiple myeloma.
The diagnosis requires an appropriate combination of clinical assessment, blood and urine testing, imaging and, when indicated, examination of the bone marrow.
Key Takeaways
Multiple myeloma is a cancer of abnormal plasma cells, not a disease of the blood vessels.
The term "cancer without joints" is not a recognized medical name for multiple myeloma.
Bone pain, especially persistent pain in the back or other bones, can occur because myeloma can weaken bone.
Anemia can cause fatigue, weakness and shortness of breath.
Myeloma can sometimes cause high blood calcium and kidney problems.
Recurrent infections can occur because normal immune function may be affected.
Sudden back pain with new weakness or numbness requires urgent medical evaluation.
Skin rashes and discoloration should not automatically be interpreted as signs of myeloma.
Symptoms alone cannot diagnose the disease.
Doctors may use blood tests, urine tests, imaging and bone-marrow examination to investigate suspected myeloma.
MGUS, smoldering myeloma and active multiple myeloma are different conditions.
There is no established food, supplement or "detox" approach that prevents multiple myeloma.
Routine screening is not recommended for most asymptomatic people.
Medical Disclaimer
This article provides general health information and is not a diagnosis or substitute for medical care. Symptoms such as bone pain, fatigue, abnormal blood tests or kidney problems can have many causes. If you have persistent, unexplained or worsening symptoms, discuss them with a qualified healthcare professional. Seek urgent medical attention for severe neurological symptoms, significant breathing difficulty, severe confusion, serious bleeding or other potentially life-threatening symptoms.
Health Related Articles
Because anemia can have many different causes, understanding the role of diet and iron is also important. See our guide Coconut Milk for Anemia: Nutrition, Iron Content & What to Know for more information about dietary iron and anemia.
Kidney problems can have many causes and often require dietary and medical considerations specific to the individual. For broader information about kidney-friendly eating, see our guide Kidney-Friendly Diet: What to Eat, Drink & Know.
Bone pain and weakening can have many causes beyond multiple myeloma. For general information about supporting bone health and understanding common bone-health misconceptions, see Bone Health Myths Explained: Natural Ways to Support Strong Bones.
External ResourcesFor a detailed overview of multiple myeloma symptoms and possible complications, see the American Cancer Society guide to multiple myeloma signs and symptoms.
For more information about blood tests, urine tests, imaging and other investigations used for suspected myeloma, see the American Cancer Society guide to tests for multiple myeloma.
For additional information about how multiple myeloma is sometimes discovered and why routine screening is not generally recommended for people without symptoms, see the American Cancer Society information on early detection of multiple myeloma.
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