Workplace exposure to petroleum-based lubricants is linked to a 38% higher odds of multiple sclerosis, according to a study published November 4, 2026, in Neurology.
Industrial Swedish Study Links Lubricants to MS Risk
Researchers analyzed data from 2,872 people diagnosed with MS between 2005 and 2015 alongside 6,122 people without the disease. Participants in the Swedish study completed questionnaires regarding their work histories and exposure to engine oil, concrete form oil, and cutting fluids. A total of 251 MS patients reported occupational exposure, compared to 399 individuals in the control group.
Men reported workplace contact with these substances more frequently than women. Among all exposed participants, 23% worked in metalworking, 17% in construction, 11% in car repair, and 10% in machinery maintenance. Tiny droplets and vapors released into the air during industrial tasks can be inhaled, potentially triggering lung inflammation and immune system changes.
Lubricant contact increases MS odds over time
The statistical association between lubricant contact and MS persisted across various job roles after researchers adjusted for age, sex, residential area, and smoking habits. Each additional year of occupational exposure increased MS odds by 2%, and each additional weekly hour added another 2% to the odds. All examined lubricant categories showed an association except for hydraulic oil.
“Our findings suggest that exposure to these products in the workplace, which is common in industrial settings, is associated with higher odds of MS, especially when combined with smoking or certain genetic characteristics,” Anna Karin Hedström said in a press release from the American Academy of Neurology. Hedström serves as the study’s first author and a senior research specialist at Karolinska Institutet in Stockholm, Sweden.
Smoking and genetics multiply MS risk factors
The study evaluated whether lifestyle and genetic factors altered the statistical association. Current smokers who worked with petroleum-derived lubricants experienced higher MS odds than the combined individual effects of smoking and workplace exposure alone. Researchers observed a similar multiplier effect among exposed individuals who lacked the HLA-A*02:01 genetic variant, which is typically linked to lower MS risk.
Participants who faced workplace exposure, smoked, carried the HLA-DRB1*15:01 risk variant, and lacked the protective gene variant showed nearly 34 times the odds of developing MS compared to unexposed nonsmokers lacking those genetic traits. However, Hedström cautioned that this particular estimate relied on just 16 MS patients and two control participants, rendering the figure less precise.
Association findings require more research into causation
Investigators emphasized that the published findings demonstrate an association rather than direct causation. Because occupational exposures were self-reported, other unmeasured workplace factors might have influenced the outcomes. To address the possibility that the disease was already developing silently before symptoms emerged, researchers excluded exposures occurring within the seven years prior to symptom onset; this subset still showed a 55% higher odds of MS among exposed individuals.
“These findings point to the need for a closer look at workplace exposures that may play a role in MS risk,” Hedström stated, noting that future studies must gather more granular timing and volume data regarding occupational lubricant handling.
Frequently Asked Questions About Workplace MS Risks
What specific petroleum-based lubricants were linked to multiple sclerosis?
Engine oil, concrete form oil, and cutting fluids used for metal cooling or lubrication were associated with higher MS odds. Hydraulic oil was the only tested substance that did not demonstrate a statistically significant link.
How many years of data were included in the Swedish research project?
The study evaluated MS diagnoses recorded between 2005 and 2015, comparing 2,872 patients against 6,122 matched individuals without the disease.
Did the research prove that industrial oils directly cause multiple sclerosis?
No. Investigators stressed that the study only reveals an association between workplace exposure and increased odds of MS, not definitive proof of causation.