Does every auditory hallucination come from brain damage?

No: Usually auditory hallucinatios are from mental illness but theyt can come from drugs or delirium or brain damage. The most common form of hallucinations from brain damage is visual hallucinations. However, if an older person had voices we would worry about brain issues. A younger person with voices is usually psychotic but we would still check the brain.

No: Hallucinations do not have to come from brain damage. In schizophrenia the dopamine hypothesis holds that there is too much dopamine in the new receptors in the brain. This causes hallucinations. So another words we're not talking about brain damage per se. We are talking about a chemical imbalance.

No: Auditory hallucinations commonly occur with psychiatric illnesses, such as schizophrenia. In most cases, there is no evidence of physical brain damage in schizophrenia. Auditory hallucinations can also be be a side effect of certain medications, especially stimulant medications such as Ritalin, (methylphenidate) Adderall, and Amantadine. Traumatic brain injury does increase the risk of psychiatric illness.