You might assume nuclear workers or X-ray technicians face the greatest occupational radiation exposure, but new research points somewhere much less obvious: the sky. An analysis of more than 500 occupations found that flight attendants had the highest proportion of radiation-related cancer deaths, followed by pilots. Researchers say the likely culprit is cosmic radiation, which becomes more intense at cruising altitude because there is less atmosphere available to absorb and scatter high-energy particles.
Aircrew members may receive an estimated 3 to 6 millisieverts of cosmic radiation each year, far more than the exposure received by occasional travelers. In the study, flight attendants were 50% more likely and pilots 36% more likely to die from cancers considered potentially radiation-related compared with other occupational groups. The researchers emphasized that the study does not prove cosmic radiation caused those cancers, but the pattern stood out because aircrew did not show the same excess for cancers not typically associated with radiation.
The bigger issue is cumulative exposure. Years spent at high altitude can add up, and frequent night flights may also disrupt circadian rhythms — another factor linked to long-term health concerns. For people who fly often, especially aircrew, it makes sense to think beyond the destination and consider the biological cost of repeated time in the sky. Supporting healthy sleep, minimizing unnecessary flights when practical and paying attention to total exposure may be simple ways to reduce some of that burden over time.
SOURCE:
ScienceAlert, August 18, 2026