The association of lunar phases and mental illness: fact or myth?

  • KY Loh


Since ancient times, human has been fascinated by thechanging lunar phases – a monthly cycle that takes 29.53days to complete. Many cultures in the world holdthe beliefs that the changing lunar phases affect humanbehaviour; in particular, full moon has been associated withmadness. The word “lunatic” (previously used to mean mentallyill) came from Latin lunaticus which in turn was derived fromluna meaning moon. (copied from article)


Concise Oxford Dictionary, 10th Edition. Oxford: United Kingdom, 2001.

Templer DI, Veleber Dm. The moon and madness: a comprehensive perspective. J Clin Psychol. 1980;36(4):865-8.

Jones PK, Jones SL. Lunar association with suicide. Suicide Life Threat Behav. 1977;7(1):31-9.

Gerlock A, Solomons HC. Factors associated with the seclusion of psychiatric patients. Perspect Psychiatr Care. 1983;21(2):46-53.

Cohen-Mansfield J, Marx MS, Werner P. Full moon: does it influence agitated nursing home residents? J Clin Psychol. 1989 ;45(4):611-4.

Amaddeo F, Bisoffi G, Micciolo R, et al. Frequency of contact with community-based psychiatric services and the lunar cycle: a 10-year case-register study. Soc Psychiatry Psychiatr Epidemiol. 1997;32(6):323-6.

Owen C, Tarantello C, Jones M, Tennant C. Lunar cycles and violent behaviour. Aust N Z J Psychiatry. 1998;32(4):496-9.

Wilkinson G, Piccinelli M, Roberts S, et al. Lunar cycle and consultations for anxiety and depression in general practice. Int J Soc Psychiatry. 1997;43(1):29-34.

Barr W. Lunacy revisited. The influence of the moon on mental health and quality of life. J Psychosoc Nurs Ment Health Serv. 2000;38(5):28-35.

McLay RN, Daylo AA, Hammer PS. No effect of lunar cycle on psychiatric admissions or emergency evaluations. Mil Med. 2006;171(12):1239-42.

How to Cite
LohK. (2012). The association of lunar phases and mental illness: fact or myth?. Malaysian Family Physician, 2(1), 1. Retrieved from
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