Hallucinations are those that do not exist in the objective world but can be felt by the patient. They are divided into hallucinations of hearing, vision, touch, taste and smell according to different sensory organs. The most frequent hallucination in schizophrenic patients is hallucinations, which can be heard in a variety of ways and can be divided into verbal hallucinations, such as speech, singing, and television broadcasting. There are also elemental hallucinations, like monotonous sounds, such as the sound of rushing water. Some patients also perceive the distance, like hearing sounds that are clearer and some sounds that are blurred. Depending on whether or not they are heard directly through the auditory senses, they can be divided into true hallucinations, which are heard through the patient’s ears, and pseudohallucinations, which are heard in the patient’s head or stomach. Although hallucinations are illusory perceptions, they are often believed to be true and affect the patient’s daily life because the patient’s brain function is disturbed and cannot be distinguished.