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Overview

What Is Multiple Myeloma?

Multiple myeloma is a blood cancer that begins in plasma cells, immune cells made in the bone marrow. In this disease, abnormal plasma cells grow out of control and can crowd out healthy blood-forming cells or produce harmful proteins. It most often affects older adults, although other adults can also develop it. In simple terms, a myeloma definition is a cancer of plasma cells that can affect the bones, blood, kidneys and immune system.

Symptoms

Symptoms of Multiple Myeloma

Early multiple myeloma may cause no noticeable symptoms and may be found during blood tests for another reason. When symptoms occur, they can result from anemia, bone damage, kidney problems or high calcium levels. The signs can vary, so persistent or unexplained symptoms should be assessed by a healthcare professional.

  • Bone pain, especially in the ribs, hips or other bones.
  • Back pain related to weakened vertebrae or bone damage.
  • Broken bones after a minor injury or without an obvious cause.
  • Tiredness or shortness of breath caused by anemia.
  • Frequent or serious infections caused by reduced immune protection.
  • Increased thirst or urination caused by high calcium levels (hypercalcemia).
  • Nausea or constipation related to hypercalcemia.
  • Unexplained weight loss.
  • Swelling in the legs or feet related to kidney impairment.
  • Muscle weakness or confusion related to kidney problems or high calcium.

Causes

Causes of Multiple Myeloma

Multiple myeloma develops when genetic changes cause one plasma-cell clone to grow abnormally in the bone marrow. These abnormal cells can produce an abnormal monoclonal protein, also called an M protein, and interfere with normal blood-cell production. The precise change that starts this process is usually unknown. Researchers continue to study how inherited biology and environmental factors may contribute to this myeloma disease.

WHAT IS KNOWN

It is not your fault

Multiple myeloma is not generally caused by a person’s everyday actions, and it is not usually inherited directly from a parent. Rare familial patterns may slightly increase risk, but having a relative with myeloma does not mean that someone will develop it.

Risk Factors

Risk Factors for Multiple Myeloma

Nonmodifiable risk factors

  • Older age is associated with a higher likelihood of developing multiple myeloma.
  • Male sex is associated with a somewhat higher risk than female sex.
  • Black race is associated with a higher population-level risk in the United States.
  • Having a close relative with multiple myeloma may modestly increase risk.
  • A personal history of monoclonal gammopathy of undetermined significance (MGUS) or smoldering myeloma increases the chance of progression to active disease.

Other possible associations

Obesity and some workplace or environmental exposures have been studied as possible associations with myeloma cancer. These associations do not prove that a particular exposure caused the disease or that an individual will develop it. Most people with one or more risk factors never develop multiple myeloma.

Side Effects & Complications

Multiple Myeloma Complications and Treatment Side Effects

  • Fractures and spinal cord compression can result from weakened bones or vertebral damage.
  • Severe high calcium levels (hypercalcemia) can cause dehydration, confusion or heart problems.
  • Kidney failure can develop when abnormal proteins, dehydration or high calcium damage the kidneys.
  • Anemia can cause fatigue, weakness and shortness of breath.
  • Recurrent or serious infections can occur when normal immune defenses are reduced.
  • Blood clots can occur because of the disease or some treatments.
  • Amyloidosis may occur when abnormal proteins build up in organs and tissues.

Treatment-related side effects

Multiple myeloma treatments can cause fatigue, nausea, nerve damage, low blood counts and a higher risk of infection. Chemotherapy, targeted medicines, immunotherapy, corticosteroids, radiation and stem cell transplantation can each have different effects, including effects on the nerves, heart, lungs, liver or kidneys. The hematology team monitors these risks and may adjust treatment or provide supportive medicines.

GET MEDICAL HELP PROMPTLY

Know when symptoms are urgent

Seek urgent medical advice or emergency care for sudden severe back pain, new leg weakness or numbness, confusion, chest pain, trouble breathing, very little urine or fever during treatment. These symptoms may signal spinal cord compression, infection or another serious complication.

Diagnosis & Staging

Diagnosis and Staging of Multiple Myeloma

  • Complete blood count and chemistry tests check blood-cell levels, calcium, kidney function and other organ measures.
  • Serum and urine protein studies look for abnormal monoclonal proteins.
  • Free light-chain testing measures abnormal antibody fragments in the blood.
  • A bone marrow biopsy examines plasma cells and may include chromosome or genetic testing.
  • Imaging such as low-dose CT, MRI or PET-CT looks for bone lesions, fractures or areas of active disease.

How staging works

Staging systems estimate disease burden and outlook using measures such as beta-2 microglobulin, albumin, LDH and specific chromosome changes. Stage I, II or III reflects the extent and biological risk of the disease rather than a simple description of symptoms. Specialists combine these results with overall health, kidney function and treatment response when assessing myeloma disease.

Treatment Options

Multiple Myeloma Treatment Options

SYSTEMIC MEDICINES

Targeted medicines such as proteasome inhibitors and immunomodulatory drugs attack myeloma cells or affect the environment that supports them. They are often combined with corticosteroids and other medicines based on disease risk, previous treatment and overall health.

CHEMOTHERAPY AND IMMUNOTHERAPY

Chemotherapy may be used in selected treatment plans, including around transplant. Monoclonal antibodies and other immunotherapies help the immune system recognize or attack abnormal cells, while corticosteroids can strengthen combination regimens.

CLINICAL TRIALS

Clinical trials provide access to approaches being studied for newly diagnosed, relapsed or treatment-resistant disease. A hematology team can explain potential benefits, risks and eligibility for a particular trial.

Stem cell transplant and local treatment

An autologous stem cell transplant, using a person’s own collected stem cells, may be considered for people who are fit enough and meet the clinical criteria. Radiation, surgery or vertebral procedures may help selected painful lesions, fractures or spinal problems. Treatment plans are individualized according to symptoms, disease risk, overall health, prior treatment and transplant eligibility.

  • Bone-strengthening medicines can lower the risk of fractures and other bone complications.
  • Pain control may include medicines, radiation or procedures for specific bone problems.
  • Infection prevention may include vaccines, preventive medicines and prompt evaluation of fever.
  • Transfusions may be used when low blood counts cause significant symptoms or risks.
  • Kidney-protective care includes hydration, medication review and treatment of contributing problems.
  • Treatment of high calcium levels may include fluids and medicines that lower calcium.

Outlook and Prognosis

Multiple Myeloma Prognosis

Multiple myeloma is usually treatable, but it is not commonly considered curable. Many people have periods when treatment controls the disease, followed by relapse that requires additional therapy. New multiple myeloma treatments continue to improve control and quality of life, so prognosis varies substantially from person to person.

  • Stage and overall disease burden help indicate how much disease is present.
  • Chromosome changes in the myeloma cells can influence risk and treatment response.
  • Kidney function can affect both outlook and treatment choices.
  • Age and overall health influence tolerance of treatment and recovery.
  • Response to initial treatment provides information about disease behavior.
  • Whether the disease returns and how it responds to later treatment also affect prognosis.

Survivorship & Follow-up

Survivorship and Follow-Up

  • Scheduled blood and urine tests help assess treatment response and detect changing disease activity.
  • Periodic imaging or bone marrow testing may be recommended when symptoms, laboratory results or treatment plans indicate it.
  • Monitoring of monoclonal protein and free light chains can help identify relapse or progression.
  • Kidney and bone health checks help prevent or manage long-term complications.
  • The care team reviews treatment side effects and adjusts supportive care or medicines as needed.

Living well during long-term care

Ask about vaccination and infection-prevention steps, and choose physical activity that fits your bone health and energy level. Nutrition support, emotional counseling and practical help can be valuable during recovery and ongoing care. Discuss fertility or sexual health concerns, work and financial planning, and keep an updated treatment summary for every healthcare professional.

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