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Hearing voices is a serious symptoms and lead to significant distress to patient. It occur in schizophrenia
and organic psychosis
(may be due to TBI in your case).
As head injury
occur years before, then irrespective of cause and diagnosis, your current treatment will not change much. So it is better to continue current medicines and inform your psychiatrist
about existence of voices as medicine or its doses may need to be changed.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal