An egoist is someone who behaves self-centeredly, prioritizing their own interests and happiness over those of others. In psychology, such self-centered behavior and thought patterns are often viewed as an excessive focus or emphasis on the ego. Egoists tend to disregard or overlook the emotions and needs of others as they pursue their own desires, benefits, and satisfaction.

Egoism is often linked to the function of the ego in Freudian psychoanalytic theory, which involves balancing personal reality adaptation and impulse control. However, the actions of an egoist suggest a skewed functioning of the ego, where the regulation of personal desires and consideration of social norms and relationships are imbalanced.

Egoism can also be associated with narcissism, where individuals with extreme self-love exhibit a strong desire for exhibition and seek admiration and approval from others. This overlaps with the characteristics of an egoist who prioritizes their own benefits above all else.

While egoism might seem beneficial for personal success and goal achievement, it can lead to friction and conflict in interpersonal relationships. Finding a balance between self and others, and moderating egoistic tendencies, is key to building healthier and more fulfilling relationships.