(1) Delusion of victimization: It is the most common type of delusion in clinical practice. The patient is convinced out of nothing that certain people or certain groups are carrying out unfavorable activities against him, striking, retaliating, framing, and destroying. For example, he is convinced that someone is poisoning his food and water, and that someone is following him and spying on him. Such delusions often begin as sensitive and suspicious, and become more pronounced as time passes and lengthens. Delusions of victimization are often associated with hallucinations, and can also coexist with exaggerated delusions, relationship delusions, jealous delusions, and belligerent delusions. It is mainly seen in schizophrenia and paranoid psychosis. (2) Relationship delusions: The patient perceives some phenomena in the surrounding environment that are actually unrelated to him as being related to him. The patient may think that what others say, what is on TV, what is on the radio, what is reported in the newspaper, or what some unknown people do, is related to him in some way. Relationship delusions are often intertwined with delusions of victimization. (3) Delusion of physical influence: Also known as the feeling of being controlled. The patient feels that his own mental activities are controlled by some external force, such as being controlled by electric waves, ultrasound or special advanced instruments without autonomy. For example, the patient feels that his brain has been controlled by a computer and that he is a robot. The feeling of being controlled is a characteristic symptom of schizophrenia. (4) Exaggerated delusions: Mostly produced in the context of heightened emotions, the patient believes that he or she has amazing abilities, a great deal of wealth, a very high position, many inventions, etc. The delusion content has some relationship with time, place, environment, patient’s cultural level, religious belief and experience. For example, the exaggerated delusions of manic patients tend to believe that they are capable, competent and wealthy, but they are not ridiculous and bizarre; the exaggerated delusions of schizophrenic patients tend to be generalized and ridiculous, such as believing that they are the Jade Emperor or the son of the president of a certain country. The exaggerated delusions of patients with paralytic dementia are more childish and absurd, such as believing that they own many gold mountains and have hundreds of sons. Exaggerated delusions are mostly seen in schizophrenia, mania, paralytic dementia, and paranoid psychosis. (5) Delusions of guilt: Also known as self-criminal delusions. Patients baselessly believe that they have committed serious mistakes, unforgivable sins, and should be severely punished, and that they are so guilty and deserving of death that they are sitting on the sidelines or refusing to eat to commit suicide, and the patients themselves ask for labor reform to atone for their sins. This is mainly seen in depression, but also in schizophrenia. (6) Hypochondriac delusions: Patients unfoundedly believe that they are suffering from some serious physical disease or incurable disease, and therefore seek medical help everywhere, even though they cannot be corrected through a series of detailed examinations and repeated medical verification, such as believing that there is a tumor in the brain and that the heart has stopped beating. Such delusions can be based on fantasy and visceral receptor perception syndrome. Some patients develop delusions of nothingness on the basis of delusions of suspicion, i.e., patients believe that everything in the world does not exist, everything is false, and even they do not exist, but only an empty shell, such as a patient believes that “his heart, liver, and lungs are rotten”, “his brain is empty”, “his blood is stagnant”, and “his heart is not working. “, “the blood is stagnant”. Most often seen in schizophrenia, menopause and old age mental disorders. (7) Belligerent delusion: The patient is convinced that a person of the opposite sex has fallen in love with him or her and behaves accordingly, such as writing letters, making phone calls, dating, etc. to show love, and despite the severe rejection by the other party, the patient remains convinced, while believing that the other party is testing him or her still repeatedly pestering him or her. Most often seen in schizophrenia. (8) Jealous delusions: Patients are convinced that their lover is unfaithful to them and is having an affair. For this reason, the patient may secretly follow and monitor the daily activities of the spouse or intercept and open letters written to the spouse and check the spouse’s clothes and other daily necessities in order to find evidence of an affair. It is mostly seen in alcoholic psychosis with hypogonadism, but also in schizophrenia, menopausal psychosis, reactive psychosis, paranoid psychosis, and geriatric psychosis. (9) Sense of being insightful: i.e., inner disclosure or mind-reading disorder. The patient is not surprised that what he or she thinks is known to others without saying anything. Although the patient cannot figure out how others know, he or she is convinced that it is known to all, or even made to be known. This symptom is important for the diagnosis of schizophrenia. (10) Delusions of theft: The patient is convinced that his or her things have been stolen by others, and that the stolen things range from the furniture in the home to a needle and thread in the home. It is mostly seen in geriatric psychosis, schizophrenia, and paralytic psychosis. (11) Delusions of special significance: This can be based on delusions of relationship, in which the patient believes that all the words and actions of people around him, ordinary actions, are not only related to him, but also endowed with special significance. (12) Non-descent delusions: The patient is convinced without any basis that he is from a famous family, descended from a great man, or has a royal bloodline of a country, but denies being born of his biological parents. This symptom often coexists with exaggerated delusions and is most often seen in schizophrenia.