Also known as 'Delusional Disorder', this illness has several types. The symptoms of this illness consist of thought deficits such as: skepticism, grandiosity, eroticism, delusions and jealousy. The individual's life is negatively affected due to unrealistic thoughts, for example: because s/he sees their closest friend as their enemy and vice versa the individual's relationships may be disrupted and might also lose his/her place in society because of unfit actions. It is believed that these people have chemical imbalances in the areas of the brain responsible for suspicion, jealousy and anger.