The causes of BPD are still being studied and are not fully understood; however, it is known to result from compiled factors like genetic predisposition, neurological functioning, and environment. BPD is more likely to occur if seen in the family history. Additionally, research evidence suggests that BPD could be caused by differences in neurological functioning, such as imbalanced neurotransmitters like serotonin. However, a borderline personality disorder is frequently linked with an unsupportive childhood that consists of traumatic experiences and insecure attachment styles formed with the caregiver. An event does not need to be extensive to be traumatic; instead, it is a perceived threat to safety. Further, BPD is most commonly linked with two insecure attachment styles: ambivalent attachment (also known as anxious or preoccupied) and disorganized (also known as fearful). Attachment develops between a child and their caregiver and can become insecure when a child's needs are not adequately met. In the case of ambivalent attachment, a child learns that they cannot rely on their caregivers to meet their needs, leading to low self-esteem, a fear of abandonment, and maladaptive attention-seeking. Disorganized attachment shares the same fearful characteristics, though a child becomes extremely confused by parental inconsistency. The caregiver becomes a source of fear rather than safety, and a child displays the want to engage and reject their caregiver. Because of these insecurities, maladaptive behaviors develop and lead to poor coping strategies, emotional dysregulation, and underdeveloped relationship skills.