BPD may include psychotic breaks, and these are uncharacteristic of NPD but not unknown. The need for constant attention is also found in Histrionic Personality Disorder, but HPD and BPD are both strongly oriented towards relationships, whereas NPD is characterized by aloofness and avoidance of intimacy. Grandiosity is unique to NPD among personality disorders , but it is found in other psychiatric illnesses. Bipolar illness also contains strong elements of grandiosity. Mild impairment when self-centered or egotistical behavior results in occasional minor problems, but the person is generally doing pretty well.
Grandiosity is the hallmark of narcissism.
The simplest everyday way that narcissists show their exaggerated sense of self-importance is by talking about family, work, life in general as if there is nobody else in the picture . Whatever they may be doing, in their own view, they are the star, and they give the impression that they are bearing heroic responsibility for their family or department or company, that they have to take care of everything because their spouses or co-workers are undependable, uncooperative, or otherwise unfit. But this everyday grandiosity is an aspect of narcissism that you may never catch on to unless you visit the narcissist's home or workplace and see for yourself that others are involved and are pulling their share of the load and, more often than not, are also pulling the narcissist's share as well. Another example is claiming unusual benefits or spectacular results from ordinary effort and investment, giving the impression that somehow the narcissist's time and money are worth more than other people's. In public it presents a front of patience, congeniality, and confident reasonableness.