Large Scale Population Study Reveals Strong Familial Clustering Of Suicide Attempts Among Female First Degree Relatives

Swedish study in BMJ Mental Health finds suicide attempt risk clusters heavily in women, with sisters and mother-daughter pairs showing the highest risk.

By: AXL Media

Published: Mar 11, 2026, 5:28 AM EDT

Source: The information in this article was sourced from BMJ Group

Decoding the Sex Paradox in Suicidal Behavior

Suicide research has long navigated a complex "sex paradox": while men are more likely to die by suicide, women are approximately twice as often to attempt it. To understand the roots of this disparity, researchers analyzed Swedish population registers covering over 3 million individuals born between 1963 and 1998. According to the study published in BMJ Mental Health, the goal was to determine whether the higher incidence of suicide attempts in women is driven by genetics or by the unique environmental and social pressures shared within female familial circles.

Clustering Risk Within the Female Family Line

The research team evaluated familial risk across several categories, including mother-child pairs and full siblings. The data revealed that suicide attempt risk is not evenly distributed but clusters heavily within families. Most notably, the risk was found to be more than three times higher in mother-child pairs where a parent had previously made an attempt. Furthermore, the highest overall risk—nearly four times higher—was observed specifically between sisters, suggesting that the female family line carries a unique susceptibility that is less pronounced in male-to-male or mixed-sex relatives.

The Genetic Ceiling of Suicidal Risk

To isolate the influence of nature versus nurture, the investigators compared full siblings with maternal half-siblings. According to the analysis, approximately 42% of the risk for suicide attempts is heritable. Interestingly, this percentage of heritability did not differ significantly between men and women. This suggests that while genetics provide a baseline for vulnerability, they cannot be the sole explanation for the observed sex differences in suicidal behavior. Instead, the researchers point toward non-genetic factors as the primary drivers of the female-specific risk surge.