There is no guaranteed way to prevent non-Hodgkin’s lymphoma (NHL), but you can meaningfully lower your risk by addressing several known contributing factors. Unlike some cancers with a single dominant cause, NHL is linked to a mix of infections, chemical exposures, immune system problems, body weight, and lifestyle habits. Most of these are at least partially within your control.
Maintain a Healthy Body Weight
Carrying excess weight is one of the more consistent risk factors for NHL. A meta-analysis of 16 prospective studies found a 7% increase in NHL risk for every 5-point rise in BMI. That might sound modest, but the risk climbs with severity: people with severe obesity face roughly 80% higher odds of developing diffuse large B-cell lymphoma, the most common aggressive subtype. A large U.S. study of over 900,000 adults found that obesity was linked to 56% higher NHL mortality risk in men and 95% higher in women.
The connection likely involves chronic low-grade inflammation and changes in immune signaling that come with excess body fat. Losing weight won’t eliminate risk, but reaching and staying at a healthy BMI is one of the most actionable steps you can take.
Eat a Plant-Rich, Anti-Inflammatory Diet
A plant-based Mediterranean diet, built around vegetables, fruits, whole grains, legumes, nuts, and olive oil, has anti-inflammatory properties that appear protective against multiple NHL subtypes. Cleveland Clinic oncologists specifically recommend this pattern for lymphoma risk reduction. The emphasis is on consistently eating whole plant foods rather than focusing on any single “superfood.” Processed meats, refined sugars, and heavily processed foods push inflammation in the wrong direction.
Reduce Chemical and Pesticide Exposure
Certain workplace and environmental chemicals carry well-documented NHL risk. The two most important to know about are benzene and glyphosate-based herbicides.
Benzene is classified as a confirmed human carcinogen. Workers in oil and gas extraction, petroleum refining, and shoe production face the highest exposures. A Swiss national study found that high benzene exposure nearly tripled the risk of diffuse large B-cell lymphoma (HR 2.78) and increased follicular lymphoma risk by 58%. If you work in these industries, proper ventilation, respirators, and exposure monitoring are essential.
Glyphosate, the active ingredient in Roundup and the most heavily used herbicide in the world, was classified as “probably carcinogenic to humans” by the International Agency for Research on Cancer in 2015, primarily based on its link to NHL. Studies have shown it is genotoxic to human lymphocytes, the very cells that become cancerous in NHL, even at low doses. If you use herbicides at home or professionally, wear protective equipment, minimize spray drift, and consider non-chemical alternatives for weed control.
Farming occupations in general carry elevated NHL risk. Field crop and vegetable farm workers have about 30% higher odds of NHL compared to the general population. Spray painters face double the risk. The pattern points to chronic, repeated contact with pesticides and solvents as the key issue, not brief occasional exposure.
Manage Infections That Drive NHL
Several chronic infections directly increase NHL risk by either stimulating immune cells to divide uncontrollably or suppressing the immune system’s ability to catch early cancers.
HIV
HIV infection raises NHL risk more than threefold. Three types of NHL are actually AIDS-defining conditions. While antiretroviral therapy has improved outcomes dramatically, NHL remains the leading cancer among people living with HIV in high-income countries, even with controlled viral loads. Early diagnosis and consistent treatment are critical.
Hepatitis B and C
Hepatitis C carries the strongest infection-related risk, with nearly five times the odds of NHL in one large study. Hepatitis B roughly doubles the risk. The good news: hepatitis C is now curable with antiviral treatment, and hepatitis B is preventable with vaccination. Both measures could prevent a meaningful number of NHL cases. If you haven’t been vaccinated for hepatitis B or screened for hepatitis C, these are concrete steps worth taking.
H. pylori
This common stomach bacterium is causally linked to gastric MALT lymphoma, a slow-growing NHL subtype that develops in stomach tissue. Eradicating the infection with antibiotics achieves complete lymphoma remission in 60% to 90% of patients with early-stage disease. If you have chronic stomach symptoms, getting tested and treated for H. pylori eliminates this particular risk pathway entirely.
Be Cautious With Immunosuppressive Medications
A suppressed immune system is one of the strongest risk factors for NHL. People with autoimmune conditions like inflammatory bowel disease already have a baseline two- to threefold higher lymphoma risk from the condition itself. Certain medications used to manage these diseases add to that risk.
Thiopurine drugs increase lymphoma risk three to five times above untreated patients with the same condition. When thiopurines are combined with anti-TNF biologic drugs, the risk jumps to roughly ten times higher. A rare but serious subtype called hepatosplenic T-cell lymphoma has been specifically linked to both drug classes.
This doesn’t mean you should stop prescribed medications. It means the decision to use immunosuppressive therapy should involve a clear conversation about lymphoma risk, and if a medication isn’t providing meaningful benefit, discontinuing it reduces your cumulative exposure to that risk.
Quit Smoking
Smoking is linked to elevated risk for several NHL subtypes, particularly with long-duration use. People who smoke for 40 years or more face roughly 50% to 90% higher odds of certain subtypes, including peripheral T-cell lymphoma and a rare skin lymphoma. Follicular lymphoma risk rises about 30% in ever-smokers. The longer you smoke, the higher the risk climbs. Quitting at any point begins to reduce cumulative damage.
Hair Dye and NHL Risk
Personal hair dye use has a complicated relationship with NHL. A large pooled analysis of over 4,400 NHL cases found a 30% increased risk among women who started using hair dye before 1980, when formulations contained chemicals that have since been reformulated. For women who started dyeing their hair after 1980, the risk was largely limited to users of dark-colored dyes, who had a 50% higher risk of follicular lymphoma specifically.
Longer duration, higher frequency, and greater total number of applications all increased risk in a dose-dependent pattern. If you use permanent hair dye regularly, especially dark shades, this is worth factoring into your overall risk picture. Choosing semi-permanent or plant-based dyes may reduce exposure to the chemicals involved, though direct evidence on alternatives is limited.
What You Can’t Change
Some NHL risk factors are beyond your control. Age is the biggest one: most cases are diagnosed in people over 60. Men develop NHL slightly more often than women. Certain inherited immune deficiencies and a family history of lymphoma also raise risk. Having an autoimmune condition like rheumatoid arthritis, lupus, or celiac disease increases baseline risk independently of any medications used to treat it. Epstein-Barr virus, which causes mono and infects the vast majority of adults worldwide, is linked to certain NHL subtypes but is essentially unavoidable.
The practical takeaway is that prevention is about stacking the odds in your favor across the factors you can influence: body weight, diet, chemical exposures, infection management, smoking, and informed medication choices. No single step eliminates risk, but together they represent a meaningful reduction.