Borderline personality disorder now affects more than two out of every 100 adults

A study by the University of Granada analyzes its prevalence in the general population and confirms its association with unfavorable socioeconomic factors and other mental health problems

The study opens the door to appropriate prevention strategies

Researchers from the Department of Psychiatry at the University of Granada, along with professionals from the San Cecilio University Clinical Hospital, ibs.GRANADA, and the UGR Institute of Neurosciences, have published an international study on the frequency and associated factors of borderline personality disorder. The work forms part of Ignacio Ramos Suárez's doctoral thesis and has been published in the scientific journal Journal of Affective Disorders.

This mental health problem is characterized by significant emotional instability, difficulty maintaining stable personal relationships, impulsivity, fear of abandonment, intense changes in self-perception, and, in some cases, self-harm or suicide attempts. Although it is often detected in clinical settings, until now there has been debate about how many people in the general population may have this disorder, including those who do not always receive specialized care.

Prevalence

To answer this question, the research published in the Journal of Affective Disorders, as part of the doctoral thesis of Ignacio Ramos Suárez, a psychiatrist, analyzes data from international studies, with a total of 123.680 adult participants from the general population. Based on these figures, the estimated global prevalence of borderline personality disorder is 2,41%, which is approximately more than two out of every 100 adults.

The results show that those with the illness more frequently experience situations of social and economic vulnerability. These factors should not necessarily be understood as causes of the disorder, but rather as part of a complex process in which emotional difficulties, interpersonal relationships, work functioning, and social conditions can influence each other, generating a greater risk of exclusion, psychological distress, and a decline in quality of life.

Identified vulnerability factors

Associated factors include lower levels of education, unemployment, lower income, and a disadvantaged socioeconomic status. These elements can act in two ways: on the one hand, by increasing life stress and exposure to adverse situations; on the other hand, the disorder's own symptoms, such as emotional instability, impulsivity, and interpersonal difficulties, interfere with educational, professional, and social continuity.

A relationship with age has also been observed. Prevalence tends to be higher in young adults and gradually decreases with age. “This data is especially important from a preventative point of view because it indicates that late adolescence and young adulthood are key periods for early detection and intervention,” explains UGR researcher Ignacio Ramos.

Another point is relational instability. Several studies included have found a higher prevalence of the disorder in single, separated, divorced, or living-alone individuals. “This doesn't mean that these situations cause the disorder, but rather that they form part of a cycle of vulnerability: difficulties regulating intense emotions and maintaining stable relationships can lead to breakups, isolation, or loss of social support, which in turn worsen psychological distress,” explains the scientist from the Faculty of Medicine at the University of Granada.

The researcher challenges a classic idea: that borderline personality disorder is more common in women. Although it is diagnosed more frequently in women in clinical practice, population data indicate a balanced distribution between men and women.

“This difference between clinical and population data could be due, at least in part, to the fact that the disorder manifests itself differently in men and women. Evidence suggests that, while women tend to direct their distress inward through self-harm or suicide attempts, men more frequently exhibit impulsive, aggressive behaviors or behaviors related to legal problems, which could contribute to its underdiagnosis in mental health services and explain its high prevalence in prison settings,” explains the study's author.

Finally, the study highlights a strong association between borderline personality disorder and other mental health problems. This disorder frequently occurs alongside depression, anxiety, substance use disorders, other personality disorders, psychotic symptoms, self-harm, and suicide attempts.

“This point is crucial because many people come to the healthcare system with depression, anxiety attacks, substance abuse or suicidal behavior, without the underlying disorder being detected initially,” warns Ignacio Ramos.

Key elements: prevention, early detection and early intervention

From a practical standpoint, the results help to better guide prevention strategies. If the disorder is associated with youth, social vulnerability, educational and employment difficulties, relationship instability, substance use, and suicidal risk, then specialized mental health consultation alone is not enough to address the problem.

An effective preventive strategy includes early detection in adolescents and young adults, especially when signs such as self-harm, marked impulsivity, very unstable relationships, repeated emotional crises, substance use, or suicide attempts appear.