In Greek mythology, Narcissus was a young man who looked at his own reflection in a pool of water and fell in love with it. It is normal and healthy to be concerned about your own well-being. However, for the disorder involving narcissism, known as narcissistic personality disorder, the person carries this to an extreme.
Narcissism begins when a person is in the teen or early adult years.
It is a pattern of inner feelings and outward behavior that does not meet what is expected in a person's culture. These feelings and actions continue over time and can cause problems in a person's entire life unless treated. People with narcissistic personality disorder will show several of the following signs. They may not show it, but they are easily hurt. This often happens because their expectations are so high, often to the point of being ridiculous.