Seasonality of Hair Shedding in Healthy Women Complaining of Hair LossKunz M. · Seifert B. · Trüeb R.M.
aDepartment of Dermatology, University Hospital of Zürich, and bBiostatistics Unit, Institute for Social and Preventive Medicine, University of Zürich, Zürich, Switzerland
Background: A number of otherwise healthy women with or without clinical alopecia complain of recurrent hair loss, presumably reflecting seasonality in the growth and shedding of hair. Objective: To test the hypothesis that periodicity in hair shedding reflects seasonal changes in human hair growth. Methods: Retrospective case study over a period of 6 years of apparently healthy women with the complaint of hair loss. All underwent biochemical investigations, and trichograms were made. Results: After exclusion of patients with a disease or on drugs known to cause hair loss, 823 women remained. Analysis of trichograms demonstrated annual periodicity in the growth and shedding of hair, manifested by a maximal proportion of telogen hairs in summer. A second peak seems to exist, though it is less pronounced, in spring. The telogen rates were lowest in late winter. Conclusions: These results confirm the findings of former authors who have indicated seasonal changes in human hair growth, though this is the first study performed systematically in a representative number of women.
Prof. Ralph M. Trüeb, MD
Department of Dermatology, University Hospital of Zürich
CH–8091 Zürich (Switzerland)
Tel. +41 44 255 3079, Fax +41 44 255 4431, E-Mail firstname.lastname@example.org
Received: December 18, 2008
Accepted: February 10, 2009
Published online: April 29, 2009
Number of Print Pages : 6
Number of Figures : 5, Number of Tables : 0, Number of References : 21
Vol. 219, No. 2, Year 2009 (Cover Date: August 2009)
Journal Editor: Saurat J.-H. (Geneva)
ISSN: 1018-8665 (Print), eISSN: 1421-9832 (Online)
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