What causes a widow’s peak?
Unlike male pattern baldness, which is thought to affect up to 80% of men during their lifetime, a widow’s peak is much less common and the cause of this v-shaped hairline all lies in genetics.
A widow’s peak is known as a morphogenetic trait [1] and in one study, the v0shaped hairline was found to be apparent in 29.6% of women and 32.8% of men [2] among a group of 456 healthy Japanese subjects.
However, the prevalence of widow’s peaks can vary greatly depending on the study. For example, in some studies, widow’s peak prevalence has been as high as 81% [3]. Similarly, in a study in India, widow’s peaks were found in 46.15% of male and 49.35% of female individuals, suggesting there is no significant gender bias [4]. This outcome was also recreated in a study of young adults in Nigeria where 15.45% of men and 16.36% of women had widow’s peaks [5].
Genetic conditions associated with a widow’s peak
Despite the hereditary nature of a widow’s peak, hair loss genetics aren’t the same thing. A widow’s peak is thought to be caused by multiple genes, so it can be hard to predict for certain when someone will or won’t develop this type of hairline.
However, a widow’s peak can also be associated with several genetic conditions, like:
- Aarskog syndrome
- Donnai-Barrow syndrome
- Frontonasal dysplasia
- Opitz G/BBB syndrome