Research evidence concerning the precursors (a sign or symptom that heralds another) and prodromes (an early or premonitory symptom of a disease) of the various mental disorders is growing but is at present widely dispersed and inaccessible. Clinicians have to rely on their own experience, which is often limited, when faced with several delicate diagnostic and treatment issues. This book aims to approach for the first time in a comprehensive way this emerging area of clinical psychiatry. The World Health Organisation has found that mental disorders such as depression and psychosis rank in the.