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Influence of Climate on the Prevalence of Mania

Published online by Cambridge University Press:  02 January 2018

C. E. Monaghan
University Department of Psychiatry, Regional Hospital, Galway


Monthly rates of admission of manic patients to the Department of Psychiatry in Galway Regional Hospital were examined for a five-year period. Monthly variation in admission rates was compared with monthly levels of sunshine, temperature and daylength. Results indicated a significant seasonal variation in the prevalence of mania: admission rates were higher in the sunnier months and in months with a greater average daylength. It is suggested that the presentation of mania in this fashion is due to an abnormal response to light in these patients.

Research Article
Copyright © Royal College of Psychiatrists, 1988 

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