A British Journal of Dermatology study explores the relationship between seasonality and hair loss at a population level using Google Trends data. Across all 8 countries examined in the study, summer and fall were connected with higher hair loss.

The findings support previous research studies that were constrained by little sample sizes or uniform populations in restricted geographical areas. The physiology of loss of hair as related to seasonal variation is unidentified, nevertheless.

This study synthesized digital epidemiological data from both hemispheres to confirm the clinical suspicion that the summer and fall seasons are associated with greater hair loss, said senior author Dr. Shawn Kwatra, of the Johns Hopkins University School of Medicine. This finding is clinically relevant for patients presenting in the summer and fall months with worsened hair loss and has implications in assessing the effectiveness of therapies. Future research will further clarify this association and examine the physiology of the hair cycle.

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People tend to lose hair more during the summer and fall, research study says - Drew Reports News