Vanderbilt Health researchers have found that loneliness is a significant factor linking anxiety and depression to suicidal ideation. The study, published in JAMA Network Open, suggests that addressing loneliness could be a key target for preventing suicide.
The team analyzed data from more than 62,000 participants in the National Institutes of Health’s “All of Us” Research Program. They looked at the relationships between anxiety, depression, loneliness, and suicidal thoughts over time.
While anxiety and depression are well-known risk factors for suicide, this study aimed to understand the specific role loneliness plays in that connection. The researchers found that loneliness partially mediated the relationship between both anxiety and depression and suicidal ideation.
Specifically, loneliness accounted for about 25% of the relationship between anxiety and suicidal thoughts and about 10% of the relationship between depression and suicidal thoughts. Importantly, the researchers found that loneliness was a stronger predictor of suicidal ideation than social isolation (the objective state of having few social connections).
“Our findings suggest that loneliness is a critical psychological mechanism that connects mental health symptoms to suicidal thoughts,” said Katherine Musacchio Schafer, Ph.D., the study’s lead author. “This means that even if someone is receiving treatment for depression or anxiety, we also need to specifically address their feelings of loneliness to effectively reduce suicide risk.”
The study highlights that interventions designed to increase social belonging and reduce loneliness could be life-saving. This is particularly important as loneliness has been declared a public health crisis in recent years.
