Hallucinations are a symptom of mental abnormalities. Hallucinations can be caused by a variety of diseases, except for the common schizophrenia, long-term mental stress, systemic diseases or local organic lesions of the brain affecting the auditory center may also occur, so hallucinations are not equivalent to schizophrenia.
Healthy people sometimes have hallucinations, but they occur mainly in the transitional state between waking and sleeping, and are usually transient and simple, such as hearing a bell or a person’s name, and have no diagnostic significance. Hearing the speech of a deceased loved one can also occur when a loved one is intensely missed by illness and is also not diagnostic.