Borderline personality disorder is also known as BPD, it is a mental disturbance which is characterized by broken up and unpredictable social human relationship along with careless, spontaneous and most often self- destructive activities.

Most of the experts consider this personality disorder as an effect of heritable, and environmental, and biological components. Nevertheless, it is all important to keep in mind that the precise causes are not known even. It is widely believed that borderline personality disorder may occur because of genetics, surrounded atmosphere and moreover by biological elements.

Environment is major factor for causing this personality disorder. According to the experts, it is fact that BPD and stressful upbringing experiences have a solid relation with each other. Upbringing experiences especially include caregivers. Sexual and physical exploitation, negligence whether physical or emotional, insensitivity of parents, and moreover parents separation are some of the experiences which might be connected with borderline personality disorder causes but are not bounded with it. According to Marsha Linehan, a developer of DBT i.e. Dialectic Behavior Therapy for borderline disorder, somehow emotional environment of early days when emotional needs and requirements are not fulfilled and biological elements this disorder is somehow causes BPD. It is very important to note out that all these cases are not purely stands to have this disorder, and not even all those people who have faced these experiences tend to have this disorder.

Some of the studies of early period proved that genetics are one among the borderline personality disorder causes. Further, it was difficult to calculate that whether genetics or environment is responsible for this. In the present time, there are some of the proofs which show that both the environment and genetics play a crucial role in causing borderline disorder.

According to the studies, a discrepancy in gene which is liable to control the functioning of using serotonin by brain might cause BPD, it is acceptable that people who have discrepancy in this particular gene have more chances to get borderline disorder, also if they have ever experiences difficult upbringing happenings. According to a research, monkey having variant gene have symptoms like BPD in a case of separation from their mother.

The developing procedure of this disorder is very complex. One can find a multiplicity of borderline personality disorder causes. Most of the specialists think that borderline disorder is a final result of hereditarily, environment and biological factors. There are 10 times more chances to get this personality disorder genetically. It is believed that 50% to 70% of this personality disorder is caused by genetics that can be understood by this statement, children get this disorder from their parents. Genetics are one of the borderline personality disorder causes which are greatly responsible for developing borderline disorder.

At last, it can be concluded on the basis of above statements that environment, biological and genetics elements are treated as borderline personality disorder causes. But, no studies have proved the main cause of developing borderline disorder.