What Is The Cause Of Myeloma? The Basics

Myeloma is a cancer of plasma cells in your bone marrow. These are white blood cells that normally help you fight infection. When they turn cancerous, they grow out of control and crowd out healthy cells. The exact cause is not one single thing — it is a combination of genetic changes that happen over time, often years before diagnosis.

What Is The Cause Of Myeloma?

Myeloma starts with a single abnormal plasma cell. That cell makes copies of itself, and each copy carries the same genetic mistake. Over time, more mutations build up. These changes tell the cells to keep growing and avoid dying when they should.

Researchers do not know what triggers that first cell to go wrong. What they do know is that it is not contagious. You cannot catch it from someone else. It is not caused by anything you did or did not do. Most people diagnosed with myeloma have no clear risk factor they could have changed.

The disease is closely linked to a condition called MGUS, or monoclonal gammopathy of undetermined significance. MGUS is not cancer. But about 1 percent of people with MGUS develop myeloma each year. Almost everyone with myeloma had MGUS first, even if they never knew it.

What Genetic Changes Are Involved in Myeloma?

Myeloma cells have specific chromosome problems. The most common ones involve chromosomes 13, 14, 16, and 17. Some people have extra copies of certain chromosomes. Others have pieces that break off and reattach in the wrong place.

These changes affect genes that control cell growth. For example, a mutation in the MYC gene can push cells to divide too fast. Changes in the TP53 gene can stop cells from repairing DNA damage. When both happen in the same cell, the risk of cancer goes up.

Not all genetic changes are the same. Some are more aggressive than others. People with a translocation between chromosomes 4 and 14, for instance, tend to have faster-growing disease. Those with a translocation between chromosomes 11 and 14 often have slower progression. This is why doctors test for these markers at diagnosis.

What Are the Known Risk Factors for Myeloma?

The strongest risk factor is age. The average age at diagnosis is 69. Fewer than 1 percent of cases occur in people under 35. Risk rises steadily after age 50.

Race also matters. According to the American Cancer Society, Black Americans are about twice as likely to develop myeloma as white Americans. The reason is not fully understood. It may involve genetic differences, immune system variations, or environmental exposures that affect certain populations more.

Family history plays a small role. Having a first-degree relative with myeloma increases your risk slightly. But most people with myeloma have no family history of it. The disease is not directly inherited. What may run in families is a higher chance of developing MGUS.

Obesity is a modifiable risk factor. Research published in JAMA Oncology found that people with a body mass index over 30 have about a 20 percent higher risk of myeloma compared to those with a normal BMI. The link may involve inflammation and hormone changes that create a favorable environment for cancer growth.

Are There Environmental Causes of Myeloma?

Some studies suggest that certain occupations carry higher risk. Firefighters, farmers, and people who work with petroleum products may have slightly higher rates of myeloma. The evidence is not strong enough to say these exposures directly cause the disease.

Exposure to radiation is a known risk factor. People who survived atomic bomb blasts in Japan had higher rates of myeloma years later. So did workers exposed to high levels of radiation in nuclear accidents. But the radiation levels in normal medical imaging, like X-rays and CT scans, are far too low to cause concern for most people.

Some studies have looked at herbicides and pesticides. The International Agency for Research on Cancer has classified certain pesticides as possible human carcinogens. But the link to myeloma specifically is not well established. Most people with myeloma have no known chemical exposure that explains their disease.

How Does MGUS Relate to Myeloma?

MGUS is the most important precursor to myeloma. It is a condition where an abnormal protein, called monoclonal protein, is found in the blood. The protein comes from a small group of plasma cells that have started to grow abnormally but have not turned into cancer.

MGUS is very common. About 3 percent of people over 50 have it. Most will never develop myeloma. But every person with myeloma almost certainly had MGUS first. The progression from MGUS to myeloma takes years or decades. During that time, additional genetic changes accumulate in the plasma cells.

Doctors can monitor MGUS with regular blood tests. If the monoclonal protein level rises, or if other signs appear, they may recommend a bone marrow biopsy. Early detection of progression gives more treatment options, though it does not prevent the disease.

Can Myeloma Be Prevented?

There is no proven way to prevent myeloma. The genetic changes that start the process happen deep inside bone marrow. They are not caused by lifestyle choices in most cases. This is frustrating for people who want clear answers about what they can do.

That said, maintaining a healthy weight may lower risk. Avoiding unnecessary radiation exposure is sensible. Eating a balanced diet with plenty of vegetables and whole grains supports overall immune health. None of these steps guarantee protection, but they are reasonable for general health.

What does not prevent myeloma: supplements, detox diets, or alternative therapies that claim to “cleanse” the bone marrow. These have no evidence behind them and can be harmful if they replace medical monitoring.

What Are Common Misconceptions About Myeloma Causes?

One widespread myth is that myeloma is caused by stress. There is no good evidence that stress causes any cancer, including myeloma. Stress can affect how you feel and how your body functions, but it does not create the genetic mutations that start cancer.

Another misconception is that myeloma is caused by a virus. While some viruses, like Epstein-Barr, are linked to certain blood cancers, no virus has been proven to cause myeloma. Some studies have looked at hepatitis C and HIV, but the links are weak and inconsistent.

A third myth is that diet alone can reverse or prevent myeloma. No food, juice, or supplement has been shown to prevent the genetic changes that lead to myeloma. A healthy diet supports overall health, but it is not a cure or a guarantee against this disease.

Some people believe that myeloma is always inherited. It is not. The vast majority of cases are sporadic, meaning they happen by chance. Genetic testing of family members is not recommended unless there is a strong pattern of blood cancers across multiple generations.

What Should You Do If You Are Worried About Myeloma?

If you have symptoms like bone pain, fatigue, frequent infections, or kidney problems, talk to your doctor. These can be caused by many things, but they warrant a checkup. A simple blood test can detect the monoclonal protein that signals MGUS or myeloma.

If you have been diagnosed with MGUS, follow your doctor’s monitoring schedule. Most people with MGUS never need treatment. But regular blood tests every 6 to 12 months can catch progression early if it happens.

If you have a family history of multiple myeloma, tell your doctor. They may recommend earlier or more frequent screening. But for most people without symptoms or known risk factors, routine screening for myeloma is not recommended. The disease is too rare and the tests too nonspecific to justify widespread screening.