The term "narcissism" can refer to a wide variety of behaviors or attitudes, though in most cases, it refers to a person who is self-centered, egotistic, or unable to form honest and meaningful relationships. Narcissism in men can be manifested as an inability to consider the emotions or thoughts of others, establishing a double standard, breaking down another person's self esteem or ego to boost one's own, and much more. Many of the signs of narcissism in men are the same as signs of narcissism in women, and these signs are most commonly found in romantic relationships such as boyfriends and girlfriends or husbands and wives.

Some of the signs of narcissism in men that are easily distinguishable include an avoidance of discussing emotions and using other people for the man's personal gain. He may exhibit signs of extreme self-love, though he is likely to avoid talking about his own feelings or emotions. Many people who exhibit signs of narcissism may be outwardly aggressive but inwardly sensitive, especially to criticism or harsh interactions. A boyfriend or husband who exhibits signs of narcissism in men may become emotionally unavailable the more a person shows concern or love for that man.

A man may also exhibit narcissistic rage, which occurs when the man feels he is constantly under attack by others. This often stems from a sense of entitlement, meaning the man feels he is worth more than others and deserves better treatment at all times. The man will likely exhibit signs of extreme confidence, usually in an attempt to mask a sense of inadequacy or insecurity. He will therefore have extremely high and unrealistic expectations for relationships and interactions, and when those expectations are not met, the man may become angry, enraged, or overly aggressive.

The narcissist will have an extremely fragile ego and will often find a reason to be offended or angry at someone even when no insult has been given. This may lead to false rage or consistently volatile relationships that are emotionally charged and very draining. At the same time, a lack of empathy for others is a prominent sign of narcissism in men, and the man may actively devalue others. In some cases, he may even praise another person and then devalue or insult that person immediately after. The narcissist will have extreme difficulty identifying or relating to the emotions of others as well.