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Dermatology. 2009;219(2):105-10. doi: 10.1159/000216832. Epub 2009 Apr 29.

Seasonality of hair shedding in healthy women complaining of hair loss.

Author information

1
Department of Dermatology, University Hospital of Zürich, Zürich, Switzerland.

Abstract

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.

PMID:
19407435
DOI:
10.1159/000216832
[Indexed for MEDLINE]
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