Below is from About.com and makes the case that emotional invalidation is A or THE major cause of BPD, combining with biological predisposition , to cause PD. Can people on this forum confirm these experiences as being their environment as a child?
"What is Emotional Invalidation?
Emotional invalidation is when someone communicates to you that your emotions are not valid, are unreasonable or irrational, or should be hidden or concealed.
For example, when a child is fearful, their parent might tell them, “Stop being such a baby, there’s nothing to be afraid of.” This is an emotionally invalidating response; it not only communicates to the child that their emotions are invalid but also that they are weak for having emotions......
Marsha Linehan, Ph.D., the clinical psychologist who developed Dialectical Behavior Therapy (DBT) has proposed that an “emotionally invalidating environment,” or an environment in which one’s emotional responses are consistently invalidated or punished, may interact with other factors to cause BPD.
In Dr. Linehan’s model, children at risk of developing BPD later in life are born with a biological predisposition toward strong emotional responses. Unfortunately, these strong emotional responses can be met with invalidation (which may, but does not necessarily, take the form of abuse or neglect).
It is important to note that in this model, there is an interaction between the child's emotions and the environment. Because the child has such strong emotional responses to situations that others might not react to, their emotions are more likely to be invalidated. If a parent or caregiver interprets the child's responses as overreactions, they are likely to respond with behaviors that discourage the emotional response.
Unfortunately, discouraging a child’s emotional responses, particularly if that child is temperamentally predisposed to have strong emotions, probably does not work to calm the child. Instead, it likely has the opposite effect —- the child’s emotional response is heightened, leading to an intensification of the emotion. Further, that child may miss the opportunity to learn how to manage their emotions effectively, which may lead to more emotion dysregulation down the road............
....... there is some strong evidence of a connection between childhood maltreatment and BPD (various forms of maltreatment, i.e, emotional neglect and physical abuse, are inherently invalidating of emotions). "
Steve