Hallucinations are a symptom of incorrect processing of sound by the auditory center of the brain, and the common causes can be divided into the following: 1. mental overstimulation, which can be relieved soon after leaving the precipitating environment, 2. symptoms triggered by drug use or certain drugs, usually with a clear history of drug use or medication, 3. ear diseases, commonly in the stapes and above, which can have other accompanying symptoms such as pain, fever, tinnitus, etc., 4. Intracranial lesions, such as brain tumors, encephalitis, etc., usually accompanied by positive neurological signs. 5. Psychiatric disorders, such as schizophrenia, bipolar disorder, stress disorder, etc., require prompt consultation in psychiatry.