Question

Is narcissism a mental disease or a personality disorder?

Answer 1

Mental illnesses are health conditions involving changes in emotion, thinking or behavior (or a mixture of these). Mental illnesses are also related to that distress and the problems functioning in social, work or family activities.

Complete Answer:
Narcissistic personality disorder — There are one among of the several sorts of the personality disorders — which is the mental condition of which the people have an inflated sense of their own importance, a deep and need for the excessive attention and the admiration, of the troubled relationships, and the scarcity of the empathy for the others. But behind these masks of the utmost confidence lies a fragile self-esteem which is susceptible to the slightest of criticism.
According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-V), Narcissistic Personality Disorder (NPD) is one of several personality disorders and is defined as a mental illness that is associated with a pervasive pattern of grandiosity, need for admiration and lack of empathy.
A personality disorder causes problems in many areas of life, like relationships, work, school or financial affairs. People with personality disorder could also be generally unhappy and disappointed when they are not given the special favors or admiration they believe they deserve. They'll find their relationships unfulfilling, et al. might not enjoy being around them.
At an equivalent time, people with personality disorder have trouble handling anything they perceive as criticism, and that they can:
Become impatient or angry once they don't receive special treatment.
Have significant interpersonal problems and simply feel slighted.

Note:
People with personality disorder might not want to think that anything might be wrong, in order that they could also be unlikely to hunt treatment. If they are seeking treatment, it's more likely to be for symptoms of depression, drug or alcohol use, or another psychological state problem.