Multiple myeloma is a cancer that forms in plasma cells, a type of white blood cell found in the bone marrow. It is the second most common blood cancer, typically diagnosed in older adults, with symptoms that can be subtle or absent in early stages1 2. The disease causes abnormal plasma cells to multiply uncontrollably, crowding out healthy blood cells and leading to complications such as bone damage, anemia, and kidney problems1 3. Early recognition of symptoms is critical to reduce organ damage and improve patient outcomes4 1.
Anemia Symptoms and Fatigue
Anemia, a shortage of red blood cells that carry oxygen, is a hallmark of multiple myeloma and affects the majority of patients at diagnosis, with prevalence ranging from 60% to over 90% 567. Myeloma cells suppress normal blood cell production in the bone marrow, leading to anemia5 7. This shortage results in symptoms such as pallor, fatigue, weakness, shortness of breath, dizziness, and reduced exercise tolerance5 87.
Anemia in multiple myeloma may also be worsened by kidney dysfunction, which reduces erythropoietin production—a hormone that stimulates red blood cell formation7 . Additionally, some myeloma treatments can contribute to anemia7 . Managing anemia often involves treating the underlying myeloma, nutritional supplementation (iron, vitamin B12, folate), and in severe cases, blood transfusions5 7.
- Common anemia symptoms include:
- Fatigue and weakness7
- Shortness of breath7
- Dizziness and headaches7
- Pallor (pale skin) 8
- Reduced ability to perform daily activities7
Bone Pain and Fracture Risk
Bone pain is one of the most frequent and distressing symptoms of multiple myeloma, present in up to 81% of patients at diagnosis, with the back being the most common site4 9. This pain often occurs independently of movement and can worsen at night4 9. Myeloma cells cause bone destruction by forming tumors in the bone marrow and activating cells that break down bone tissue, leading to lytic lesions—soft spots where bone is lost5 9.
This bone damage increases the risk of fractures, especially in the spine, pelvis, ribs, and skull5 9. Sudden severe back pain may indicate a vertebral fracture or spinal cord compression, which is a medical emergency requiring immediate attention9 . Bone fragility also contributes to osteoporosis, further raising fracture risk5 .
- Bone pain and fracture risk features:
- Persistent back pain, often in thoracic or lumbar spine4 5
- Bone tenderness or localized pain in hips, ribs, or skull9
- Increased risk of fractures from minor injuries or stress5 9
- Osteolytic lesions visible on imaging5
- Possible spinal cord compression causing numbness or muscle weakness9
Bone pain in multiple myeloma can be severe and persistent. It often signals underlying bone destruction and increases fracture risk, especially in the spine and ribs. Early evaluation and treatment are essential to prevent complications4 9.
Kidney Dysfunction and Damage
Renal (kidney) dysfunction is a major complication in multiple myeloma, affecting up to 50% of patients at diagnosis5 6. The kidneys can be damaged by abnormal proteins produced by myeloma cells, which form casts that block kidney tubules (cast nephropathy) and cause inflammation5 . This leads to renal insufficiency, which is part of the CRAB criteria used to diagnose symptomatic myeloma10 .
Kidney impairment may present with symptoms such as decreased urine output (oliguria), swelling in the legs (edema), electrolyte imbalances, and signs of fluid retention5 . Kidney damage worsens anemia and can complicate treatment. Early detection and management of kidney problems are crucial to prevent progression to kidney failure5 1.
- Signs and symptoms of kidney dysfunction include:
- Reduced urine volume or dark urine5
- Swelling in legs or around eyes5
- Fatigue from toxin buildup5
- Electrolyte disturbances causing muscle weakness or cramps5
- Increased thirst and dehydration1
Hypercalcemia Signs and Effects
Hypercalcemia, or high blood calcium levels, occurs in about 10-15% of multiple myeloma patients at diagnosis and is a key diagnostic criterion (CRAB) for symptomatic disease5 610. It results from increased bone resorption caused by myeloma cell activity, which releases calcium into the bloodstream5 .
Elevated calcium levels can cause a range of symptoms affecting multiple organ systems. These include extreme thirst, frequent urination, dehydration, constipation, abdominal pain, loss of appetite, confusion, drowsiness, and muscle weakness5 111. Severe hypercalcemia can lead to coma and requires urgent medical treatment5 .
- Common hypercalcemia symptoms:
- Excessive thirst and urination11
- Constipation and abdominal discomfort11
- Confusion, drowsiness, and mental fogginess5 1
- Muscle weakness and fatigue5
- Dehydration and kidney impairment5
Low Platelet Count (Thrombocytopenia)
Thrombocytopenia, a low platelet count, is common in multiple myeloma due to bone marrow infiltration by malignant plasma cells5 6. Platelets are essential for blood clotting, and their reduction increases the risk of bleeding5 . Patients may experience easy bruising, petechiae (small red or purple spots on the skin), and prolonged bleeding even from minor cuts or scrapes5 .
Monitoring platelet levels is important during diagnosis and treatment, as thrombocytopenia can worsen with therapy10 . Severe or symptomatic thrombocytopenia may require platelet transfusions to prevent serious bleeding5 .
- Thrombocytopenia signs and risks:
- Frequent bruising or bleeding5
- Petechiae on skin or mucous membranes5
- Prolonged bleeding from minor injuries5
- Increased risk of hemorrhage during invasive procedures5
- Need for platelet transfusion in severe cases5
Low platelet counts in multiple myeloma can lead to dangerous bleeding risks. Patients should report any unusual bruising or bleeding to their healthcare provider promptly5 .
Low White Blood Cells (Leukopenia)
Leukopenia, or low white blood cell count, is another common complication caused by myeloma cells crowding out normal blood cell production in the bone marrow5 6. White blood cells are critical for fighting infections, so leukopenia increases susceptibility to bacterial and viral illnesses5 .
Patients with leukopenia may experience frequent infections such as pneumonia, which can be severe and life-threatening5 10. Regular monitoring and prompt treatment of infections are essential parts of managing multiple myeloma10 .
- Leukopenia consequences include:
- Increased risk of infections5
- Delayed recovery from illnesses5
- Need for infection prevention measures10
- Possible use of growth factors or antibiotics10
- Close monitoring during treatment10
When to Seek Medical Care
Early recognition and management of multiple myeloma complications can improve outcomes and quality of life6 5. Patients should seek urgent medical attention if they experience symptoms suggestive of serious complications such as renal failure, severe hypercalcemia, or infection5 .
Key signs warranting prompt healthcare contact include:
- Sudden severe bone or back pain, especially with numbness or weakness in legs, which may indicate spinal cord compression5 9
- Symptoms of kidney failure such as decreased urine output, swelling, or confusion5
- Signs of hypercalcemia including extreme thirst, confusion, or drowsiness5
- Fever, chills, or other signs of infection5
- Unexplained bleeding or bruising5
“I will do my best to get you in the best position, so that down the line we can say you had a curable version of multiple myeloma.”
— Rafael Fonseca, Mayo Clinic3
Multiple Myeloma Symptoms Summary
Multiple myeloma symptoms can be subtle or absent early on but often include a combination of the following due to the disease’s effects on bone marrow and organs1 2:
- Anemia causing fatigue, weakness, and shortness of breath5 7
- Bone pain, especially in the back, hips, or skull, with increased fracture risk4 59
- Kidney dysfunction leading to swelling, fatigue, and electrolyte problems5 6
- Hypercalcemia symptoms such as thirst, confusion, and constipation5 611
- Low platelet count causing bleeding and bruising5 6
- Low white blood cells increasing infection risk5 6
Early diagnosis is often challenging due to nonspecific symptoms, but timely intervention can reduce complications and improve survival4 51.
| Symptom/Sign | Cause | Common Effects | Prevalence at Diagnosis |
|---|---|---|---|
| Anemia | Bone marrow suppression by myeloma cells | Fatigue, pallor, shortness of breath | 60-90% 567 |
| Bone Pain | Bone destruction and lytic lesions | Back pain, fractures, spinal issues | Up to 81% 49 |
| Kidney Dysfunction | Myeloma protein deposition (cast nephropathy) | Edema, oliguria, electrolyte imbalance | Up to 50% 56 |
| Hypercalcemia | Increased bone resorption | Thirst, confusion, constipation | 10-15% 56 |
| Thrombocytopenia | Bone marrow infiltration | Bleeding, bruising | Common5 6 |
| Leukopenia | Bone marrow infiltration | Infection risk | Common5 6 |
Multiple Myeloma FAQ
What causes multiple myeloma?
Multiple myeloma begins when a single plasma cell in the bone marrow becomes cancerous and multiplies uncontrollably. The exact cause is unknown, but risk factors include older age, male gender, African American race, family history, and certain precursor conditions like MGUS5 2.
Can multiple myeloma be detected early?
Early-stage multiple myeloma may have no symptoms or only vague signs. Diagnosis often occurs after symptoms develop or incidentally during blood tests. Early recognition of anemia, bone pain, or kidney problems can prompt timely diagnosis4 51.
What are the main symptoms to watch for?
Common symptoms include fatigue from anemia, persistent bone pain (especially back pain), kidney problems, high calcium symptoms (thirst, confusion), easy bruising from low platelets, and frequent infections due to low white blood cells5 61.
Is multiple myeloma curable?
While multiple myeloma is generally considered incurable, advances in treatment have improved survival and quality of life. Early diagnosis and effective therapy can control the disease and reduce complications3 1.
