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Multiple Myeloma Side Effects: What Patients Need to Know

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A multiple myeloma diagnosis usually produces an immediate focus on one question:

How do I treat the cancer?

But there is another question that deserves equal attention:

What side effects can multiple myeloma—and its treatment—cause, and what can I do about them?

Multiple myeloma is a complicated blood cancer. Some problems are caused by the disease itself. Others are caused by chemotherapy, targeted drugs, steroids, radiation, stem cell transplantation, or supportive medications.

And some side effects disappear when treatment ends. Others can persist for months or years.

For patients and caregivers, learning to recognize, report, prevent, and manage these problems is an important part of living well with multiple myeloma.

I am a long-term multiple myeloma survivor. My own experience taught me that surviving the cancer and managing the consequences of treatment are two different challenges.

I was diagnosed with MM in early 1994. At this point in my MM journey, I am more likely to die of a treatment-related side effect than I am of multiple myeloma.

My research and experience with evidence-based non-conventional therapies is the reason why I have lived in complete remission from my incurable blood cancer since achieving complete remission in early 1999. I have learned that the best way to manage multiple myeloma is to combine the best of conventional and evidence-based non-conventional therapies.

I have come to believe that therapy-induced side effects can be life-threatening while ruining quality of life. Consider therapies shown to reduce possible side effects.

This guide brings together some of the most important multiple myeloma side-effect resources on PeopleBeatingCancer.

Important: This article is educational information, not a substitute for medical care. Tell your hematologist/oncologist about new, worsening, or severe symptoms. Some complications of multiple myeloma require urgent treatment.

Scroll down the page and post a question or a comment if there’s anything you’d like to know about multiple myeloma.

Good luck,

David Emerson

Concepts Central to Managing Your Cancer-

What Causes Multiple Myeloma Side Effects?

It helps to divide myeloma-related problems into two broad categories:

1. Side effects caused by multiple myeloma itself

The disease can:

  • Damage bone
  • Cause bone and other types of pain
  • Suppress normal blood-cell production
  • Cause anemia and fatigue
  • Increase infection risk
  • Damage kidney function
  • Increase blood calcium levels
  • Cause nerve problems
  • Contribute to spinal cord compression

The National Cancer Institute notes that myeloma can weaken bones, reduce production of normal blood cells and cause hypercalcemia, kidney problems and neurologic symptoms.

2. Side effects caused by treatment

Myeloma therapies can cause problems involving:

  • Peripheral nerves
  • Blood counts
  • Gastrointestinal function
  • Cardiovascular health
  • Kidneys
  • Eyes
  • Skin
  • Sexual and reproductive health
  • Cognitive function
  • Energy and physical function

The exact risks depend on the drugs and treatment combinations used.

For example, bortezomib can cause peripheral neuropathy, while lenalidomide can cause diarrhea and low blood counts. Carfilzomib can cause fatigue, gastrointestinal problems and, in some patients, serious heart or kidney complications.

That is why “multiple myeloma side effects” isn’t really one problem. It is a collection of problems that can occur at different points during the myeloma journey.

The Most Important Multiple Myeloma Side Effects to Know

1. Peripheral Neuropathy

Peripheral neuropathy is one of the most important treatment-related complications of multiple myeloma.

Symptoms can include:

  • Numbness
  • Tingling
  • Burning
  • Electric or shooting pain
  • Sensitivity to touch
  • Weakness
  • Balance problems

Certain myeloma treatments—notably bortezomib and thalidomide—can damage peripheral nerves.

Research has described peripheral neuropathy as one of the most important complications of myeloma treatment, with risk influenced by the particular drug, dose, schedule and combination of therapies.

PeopleBeatingCancer resources:

This article examines approaches patients can discuss with their healthcare team for managing chemotherapy-induced peripheral neuropathy, including exercise, nutritional approaches, acupuncture and other complementary strategies.

Important: “Natural” or “home” remedies should not automatically be assumed to be safe or effective. Evidence varies considerably among these approaches, and some supplements can interact with cancer treatment. Always discuss supplements and complementary therapies with your oncology team.

This is one of the most important articles in this side-effect cluster because CIPN can become a long-term quality-of-life problem.

Early reporting matters. Don’t wait until numbness or pain becomes severe before telling your medical team.

2. Multiple Myeloma Bone Damage and Pain

Bone disease is one of the defining complications of multiple myeloma.

Myeloma cells can stimulate bone destruction, resulting in:

  • Osteopenia or osteoporosis
  • Lytic lesions
  • Bone pain
  • Vertebral compression
  • Pathologic fractures
  • Mobility problems
  • Spinal cord compression

The American Cancer Society explains that myeloma can interfere with normal bone remodeling, weakening bones and increasing fracture risk.

PeopleBeatingCancer resources:

Bone pain deserves particular attention because it can be caused by the disease itself, treatment-related damage, nerve damage or a combination of problems.

New or sudden severe back pain, numbness, weakness or difficulty walking can signal spinal cord compression and requires urgent medical evaluation.

3. Fatigue

Fatigue is one of the most common and frustrating problems experienced by people with multiple myeloma.

It can result from:

  • Multiple myeloma itself
  • Anemia
  • Chemotherapy
  • Radiation
  • Inflammation
  • Sleep disruption
  • Pain
  • Reduced physical activity
  • Other medications

The National Cancer Institute notes that both cancer and cancer treatment can cause fatigue, and anemia is an important contributor.

PeopleBeatingCancer resources:

Fatigue shouldn’t automatically be dismissed as something patients simply have to tolerate. Its cause should be investigated.

4. Short-Term Treatment Side Effects

Some adverse effects occur during treatment and improve afterward.

Common examples include:

  • Nausea
  • Vomiting
  • Diarrhea
  • Constipation
  • Fatigue
  • Appetite changes
  • Hair loss
  • Skin problems
  • Mood changes
  • Low blood counts

PeopleBeatingCancer resource:

Multiple Myeloma Treatment Side Effects: 11 Common Short-Term Problems and How to Manage Them

This article is particularly useful as a starting point for newly diagnosed patients preparing for treatment.

The important distinction is that short-term does not necessarily mean harmless. Severe diarrhea, dehydration, infection, electrolyte abnormalities or dangerously low blood counts can require medical intervention.

5. Kidney Damage

Kidney problems can be caused by multiple myeloma itself as well as by certain treatments.

Myeloma proteins can damage the kidneys, and hypercalcemia can further impair kidney function.

PeopleBeatingCancer resource:

Kidney function should therefore be monitored throughout the myeloma journey.

Patients should ask their medical team about their:

  • Creatinine
  • eGFR
  • Calcium
  • Electrolytes
  • Urine protein/light chains when appropriate

Kidney function can also influence which medications can safely be used.

6. Infection and Low Blood Counts

Multiple myeloma can interfere with normal immune function, while treatment can suppress blood-cell production.

Problems can include:

  • Anemia
  • Neutropenia
  • Leukopenia
  • Thrombocytopenia
  • Increased infection risk
  • Bruising or bleeding

The American Cancer Society notes that shortages of red cells, white cells and platelets can cause fatigue, infection risk and bleeding problems.

Fever or other signs of infection during active myeloma treatment should not be ignored.

7. Blood Clots

Some myeloma treatments increase the risk of venous thromboembolism.

The risk can be influenced by:

  • The specific myeloma drug
  • Steroids
  • Previous history of blood clots
  • Immobility
  • Other medical conditions

Thalidomide and lenalidomide, for example, are associated with increased clotting risk.

Ask your hematologist whether your treatment regimen warrants preventive measures.

8. Heart and Cardiovascular Side Effects

Cardiovascular complications deserve more attention as myeloma patients live longer.

Some myeloma therapies can affect cardiovascular function.

Potential problems include:

  • Heart failure
  • High blood pressure
  • Arrhythmias
  • Shortness of breath
  • Fluid retention
  • Cardiomyopathy

PeopleBeatingCancer resource:

Some proteasome inhibitors and other cancer drugs have recognized cardiovascular risks. Carfilzomib, for example, can cause serious heart problems in some patients.

Patients with existing cardiovascular risk factors should discuss those risks before treatment begins.

9. Cognitive Problems — “Chemo Brain”

Some cancer survivors experience persistent problems with:

  • Memory
  • Concentration
  • Word finding
  • Multitasking
  • Mental processing
  • Attention

PeopleBeatingCancer has several articles exploring cognitive problems after cancer treatment.

PeopleBeatingCancer resources:

Cognitive symptoms can be influenced by much more than chemotherapy—including fatigue, sleep problems, medications, stress, pain and aging—so persistent symptoms deserve an appropriate medical evaluation.

10. Steroid Side Effects

Dexamethasone and other corticosteroids have an important role in many myeloma treatment regimens.

But steroids can produce significant side effects, particularly with prolonged or high-dose exposure.

Potential problems include:

  • Mood changes
  • Insomnia
  • Increased blood sugar
  • Muscle weakness
  • Bone loss
  • Cataracts
  • Increased infection risk
  • Avascular necrosis

PeopleBeatingCancer resources:

Steroid doses should never be changed or stopped without discussing it with the prescribing physician.

11. Cataracts and Other Eye Problems

Long-term steroid exposure can increase the risk of cataracts.

Some newer myeloma treatments can also produce important ocular toxicity.

For example, belantamab mafodotin can cause serious eye and corneal problems and requires specific eye monitoring.

PeopleBeatingCancer resources:

12. Gastrointestinal Side Effects

GI problems are common during myeloma treatment.

They include:

  • Nausea
  • Vomiting
  • Diarrhea
  • Constipation
  • Appetite loss
  • Abdominal discomfort

The specific cause matters because treatment differs.

For example, constipation may be related to medications, dehydration or reduced activity, while diarrhea can result from particular myeloma drugs or other causes.

The American Cancer Society lists gastrointestinal problems among common adverse effects of several myeloma therapies.

13. Long-Term and Late-Stage Side Effects

Perhaps the most overlooked category is the side effect that appears months or years after treatment.

These can include:

  • Persistent peripheral neuropathy
  • Chronic pain
  • Cardiovascular damage
  • Cataracts
  • Avascular necrosis
  • Cognitive problems
  • Bladder problems
  • Infertility
  • Secondary cancers
  • Other organ damage

PeopleBeatingCancer resources:

A recent systematic review and meta-analysis involving nearly 280,000 people with multiple myeloma found that hematologic second primary malignancies were substantially more common than in the general population, emphasizing why long-term survivorship monitoring matters.

Why Supportive Care Matters

Side-effect management isn’t an optional extra.

A major review of supportive care in multiple myeloma identifies bone disease, thrombosis, infection risk, peripheral neuropathy, gastrointestinal and ocular toxicities and fatigue among the problems requiring active management.

In other words:

Treating the myeloma is only part of treating the patient.

Good supportive care can help patients:

  • Remain on effective therapy
  • Maintain physical function
  • Reduce complications
  • Protect organs
  • Control pain
  • Maintain independence
  • Improve quality of life

What Should You Ask Your Myeloma Team?

Before beginning a new treatment, consider asking:

  1. What are the most likely side effects of this regimen?
  2. Which side effects are temporary?
  3. Which could become permanent?
  4. Which symptoms should I report immediately?
  5. What can we do to prevent neuropathy?
  6. How will you monitor my kidney function?
  7. How will you monitor my heart?
  8. What is my risk of infection?
  9. Do I need clot prevention?
  10. How will we protect my bones?
  11. What should I do about fatigue?
  12. Could any of these problems occur after treatment ends?

That last question is particularly important.

A Practical Multiple Myeloma Side-Effect Checklist

Patients and caregivers can keep a simple record of:

Side effect When did it begin? Severity Getting better or worse? Reported to doctor?
Fatigue
Nausea
Diarrhea/constipation
Neuropathy
Pain
Shortness of breath
Swelling
Vision changes
Sleep problems
Cognitive problems
Mood changes
Infection/fever

Keeping a record can help you and your medical team recognize patterns and decide whether a medication, dose or treatment strategy needs to change.

When Is a Myeloma Side Effect an Emergency?

Some symptoms require immediate medical attention.

Contact your medical team urgently—or seek emergency care when appropriate—for symptoms such as:

  • Sudden severe back pain
  • New weakness or numbness in the legs
  • Loss of bladder or bowel control
  • Severe shortness of breath
  • Chest pain
  • New confusion
  • Stroke-like symptoms
  • High fever during treatment
  • Severe bleeding
  • Severe dehydration
  • Sudden vision loss

Spinal cord compression and hyperviscosity syndrome, for example, can be medical emergencies.

The Bottom Line

Multiple myeloma side effects are not limited to nausea and fatigue during chemotherapy.

The disease itself can cause bone damage, pain, anemia, kidney problems, hypercalcemia, infection and neurologic complications.

Treatment can add another layer of potential problems, including peripheral neuropathy, gastrointestinal symptoms, low blood counts, blood clots, cardiovascular toxicity, eye problems, cognitive changes and long-term organ damage.

The good news is that many side effects can be anticipated, monitored and treated.

The better patients understand the potential problems before they occur, the better prepared they are to recognize symptoms early and communicate effectively with their medical team.

For me, as a long-term myeloma survivor, this has become an important lesson:

Managing multiple myeloma means managing both the cancer and the consequences of treating the cancer.

PeopleBeatingCancer’s Multiple Myeloma Side-Effect Library

Research links to include

I would use these as the core evidence links, rather than filling the article with dozens of citations:

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