Seasonality of hair loss: a time series analysis of Google Trends data 2004 to 2016

Hair loss is a frequently encountered dermatologic complaint that often generates psychological distress. Prior studies have demonstrated a seasonal pattern to hair loss. Maximal proportions of telogen hair have been found to occur in the summer, whereas lowest rates of telogen hairs occur in the winter. Additionally, a recent study demonstrated that maximal hair shedding occurs in August and September, and that the percentage of hairs in the anagen phase peaks at the beginning of spring.

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