Final answer:
A major feature of delusional disorder is a persistent belief contrary to reality, in the absence of other symptoms of schizophrenia. These persistently held delusions can vary in nature but can impact the individual's relationships and work performance.
Step-by-step explanation:
The major feature of delusional disorder is a persistent belief or suspicion that is clearly contrary to reality, in the absence of other characteristics of schizophrenia. This means the person firmly holds on to delusions despite them not being based in reality.
Some examples of these delusions can include: thinking you have a serious disease (illness delusion) despite medical tests showing you're healthy, believing you are being followed or spied on (persecutory delusion), or thinking a stranger is in love with you (erotomanic delusion).
While the individual may function normally in daily activities, they may become upset or even angry if their delusions are challenged, which could affect their relationships or work performance.
Learn more about delusional disorder