Emotional instability is the prolonged emotional reaction to a particular emotional experience even after it is over. It involves reinitiating the certain response frequently. It is said to be the heightened sensitivity for a longer duration to disappointment, failure, separation or rejection. An emotionally unstable person experiences limitless shame even in cases of slight embarrassment, immense stress in cases of minor nervousness, anger in place of slight irritation and extreme grief instead of momentary sadness.
BPD is defined by the Diagnostic and Statistical Manual of Mental Disorders (DSM) as a widespread pattern of instability in interpersonal relationships, self-image, and emotions. It also involves difficulties controlling emotions and ideas, as well as impulsive and risky conduct.
The causes of BPD are unclear. But as with most conditions, BPD appears to result from a combination of genetic and environmental factors. People with BPD come from many different backgrounds, but most will have experienced some kind of trauma or neglect as children.