Psychiatric disorders are regarded as one of the most significant, serious and agonizing illnesses because of their universality, prevalence and burden inflicted on today's women and men. This deterioration of emotional, cognitive, or behavioral working in few cases is very disturbing. Apart from knowing the physical organic factors, like endocrinal illnesses, infections or head injuries, the aetiology of these disorders has stayed a question. However, current developments in neuroscience and psychiatry have been successful in uncovering following pathophysiology and encompassing related bio-psycho-social factors. The book contains current trends and advancements in psychiatry from across the globe, illustrated in the form of diverse and descriptive research chapters. Depression and schizophrenia, two main illnesses related to this field, have been elucidated in this book. Undoubtedly, this book will serve as a valuable source for future growth and collaboration in the world of psychiatry.