Schizoid personality disorder is an uncommon condition in which people avoid social activities and consistently shy away from interaction with others. It affects more males than females. If you have schizoid personality disorder, you may be seen as a loner, and you may lack the desire or skill to form close personal relationships.
To others, you may appear somewhat dull or humorless. Because you don't tend to show emotion, you may appear as though you don't care about what's going on around you. Although you may seem aloof, you may actually feel lonely, even if it's hard for you to acknowledge. Or you may feel much more at ease being alone, and feel comfortable with your life.
The cause of schizoid personality disorder is unknown. Therapy and — in some cases — medications can help.