Flight crews face higher cancer death risk from cosmic radiation

Commercial pilots and flight attendants face a higher risk of dying from radiation-related cancers than workers in most other occupations ^[1].

The findings highlight a hidden occupational hazard for aircrew who spend significant time at cruising altitudes. Because the atmosphere is thinner at high altitudes, workers are exposed to higher levels of cosmic radiation, a factor that may contribute to long-term health declines ^[1], ^[3].

The research, led by Harvard University and published in JAMA Internal Medicine, analyzed data across more than 500 occupations ^[1]. According to the study, flight attendants had the highest percentage of deaths from radiation-related cancers among all the jobs surveyed ^[1].

Cosmic radiation consists of high-energy particles from outside the solar system. While these particles are largely blocked by the Earth's atmosphere at sea level, they are more prevalent at the altitudes where commercial aircraft operate ^[1], ^[3].

Researchers said that this exposure is a primary driver of the increased mortality rates observed in the flight crew population ^[1], ^[3]. The study suggests that the cumulative effect of years spent in the air increases the likelihood of developing fatal cancers linked to radiation ^[2].

The findings apply to flight crews worldwide, regardless of the specific airline or region of operation ^[1], ^[2]. While the aviation industry has long been aware of radiation exposure, this data provides a more direct link between the profession and cancer death rates ^[2].

The study was first reported in June 2026 ^[1], ^[2]. It underscores the need for continued monitoring of aircrew health and potentially new safety protocols to mitigate the risks associated with high-altitude cosmic radiation ^[1].