Phantom taste, or taste hallucination, is an illusory taste perception in which a taste does not exist in objective reality, but the patient perceives its existence. How should hallucinations be diagnosed? A hallucination is a real, vivid perception that is perceived in the absence of objective stimuli acting on the corresponding senses. In contrast, a hallucination is a perception that has a real external stimulus, but reacts incorrectly. Hallucinations are a kind of perceptual disorder, mainly divided into hallucinations of hearing, vision, and touch, the most common ones being hallucinations of hearing and vision. Hallucinations mostly occur in psychotic states, and can sometimes occur in normal people when they are stressed, fatigued, or have a high fever, etc. Hallucinations of taste are less common and often coexist with hallucinations of smell or other hallucinations. Patients feel that they taste a special taste when eating or drinking, which often causes refusal to eat. It is seen in temporal lobe epilepsy and schizophrenia. Phantom taste is less common in psychiatric patients. Patients often taste some special, unpleasant and unacceptable taste in food and drinks, and on this basis, patients often have delusions of victimization and affect their behavior. For example, the patient refuses to eat, and aggressive behavior occurs. The patient tastes some special or peculiar taste in food, such as metallic or medicinal taste, and thus refuses to eat. This is often combined with other hallucinations and delusions. Temporal lobe epilepsy occurs mainly in young people, and 62% of patients have their first seizure before the age of 15. Psychomotor seizures and grand mal seizures are the most common clinical symptoms, but petit mal and mixed seizures can also be seen, and the clinical manifestations are sensory (auditory, taste, and smell hallucinations). Schizophrenia includes mental disorders due to somatic diseases: Patients with schizophrenia induced by somatic factors have an acute onset and may present early with symptoms such as impaired consciousness, disorientation, and hallucinations, which need to be differentiated from symptomatic psychosis. Although symptomatic psychosis may present with symptoms similar to schizophrenia, these symptoms appear on the background of disorders of consciousness, and hallucinations are dominated by terrifying hallucinations with daytime and nighttime fluctuations. When the impairment of consciousness is reduced or disappears, the patient is in good contact with the environment, with preserved emotional responses and without the characteristic symptoms of schizophrenia.