Asthma and other symptoms in cinnamon workers.

Cinnamon, which is the bark of the Cinnamomum zeylanicum tree, contains cinnamic aldehyde, which is an irritant. Workers processing cinnamon before export are exposed to much cinnamon dust. Forty such workers with an average of four years' service in the industry were examined. Thirty five workers (87.5%) had symptoms, nine having had asthma (22.5%). Other symptoms, probably related to the irritant nature of cinnamon dust, were irritation of skin (50%), loss of hair (37.5%), and smarting of eyes while at work (22.5%). Loss of weight (65%) was the commonest finding. Contact dermatitis which has previously been described was not found in any of the workers.