Depression, introversion, and other mental illnesses
According to a 2009 research [5], those who experience serious depression and have less extroversion are more likely to additionally experience social anxiety or cluster C personality disorder, such as:
- APD, avoidant personality disorder [6]
- dependencies in personality
- Obsessive-compulsive personality disorder [7]
365 persons with bipolar disorder [8] and 296 people with significant depression were compared to a control group of 315 people in a study from 2017 [9]. According to research, persons with lower levels of extroversion, particularly those who simultaneously had greater levels of neuroticism, were more likely to have suicidal ideas or actions.