"Being excluded or ostracized is an invisible form of bullying that doesn't leave bruises, and therefore we often underestimate its impact," said Kipling D. Williams, a professor of psychological sciences. "Being excluded by high school friends, office colleagues, or even spouses or family members can be excruciating. And because ostracism is experienced in three stages, the life of those painful feelings can be extended for the long term. People and clinicians need to be aware of this so they can avoid depression or other negative experiences."
When a person is ostracized, the brain's dorsal anterior cingulate cortex, which registers physical pain, also feels this social injury, Williams said. The process of ostracism includes three stages: the initial acts of being ignored or excluded, coping and resignation.
"Being excluded is painful because it threatens fundamental human needs, such as belonging and self-esteem," Williams said. "Again and again research has found that strong, harmful reactions are possible even when ostracized by a stranger or for a short amount of time."