Voice hearing or 'auditory hallucinations' is more common than might be expected, affecting 2 - 4 percent of us. It can be experienced as part of a range of mental - health disorders, including schizophrenia, affective psychosis and dissociative conditions. Learning to live with the condition can be challenging; however, Cognitive Behavioural Therapy (CBT), on which this authoritative self - help guide is based, has been found to be highly effective.