Caccappolo, E, Kipen, H, Kelly-McNeil, K et al. · Journal of occupational and environmental medicine · 2000 · DOI
This study tested whether people with chemical sensitivities, chronic fatigue, and asthma have unusually sensitive noses. Researchers measured how well different groups could smell odors and identify them. While people with chemical sensitivities didn't actually detect odors at lower levels than others, they did report feeling more physical symptoms and found certain smells more unpleasant than other groups did.
Many ME/CFS patients report heightened sensitivity to odors and chemicals, making this finding important: it suggests that chemical sensitivity may involve how the nervous system processes and reacts to odors rather than simply having a more sensitive nose. Understanding this distinction could guide treatment approaches and help validate patients' experiences as involving real physiological differences in perception.
This study does not prove the biological mechanism underlying heightened odor sensitivity in MCS or CFS, nor does it establish causation between odor sensitivity and disease development. The cross-sectional design cannot determine whether altered odor perception predates or results from the condition. Additionally, findings were specific to PEA and may not generalize to all odors or chemical exposures.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
Spotted an error in this entry? Report it →