Hi ♫
It depends .. If you're talking about the ' primary narcissism ' or the ' secondary narcissism '. The first one is a normal stage during the childhood, it helps for the development of the libido. The symptoms are not visible for most people ( not specialist).
The second is pathologic, it's a symptom most time from a neurosis. The narcissics don't have empathy for other people. They have a huge sense of their own importance ( pompously), they are arrogant, they think they are unic and very important. Also they are conviced they are naturally superior to other people. They excessively need to be admired and too, they envy other people...
Have a nice day
Catherine