This document provides an introduction to mental health nursing. It outlines the history of mental health treatment from ancient times to modern community-based care. Key developments include the shift from viewing mental illness as demonic possession to recognizing biological and environmental factors. It also discusses the evolution of psychiatric nursing from early custodial care to contemporary therapeutic approaches based on theories like Peplau's. The goals are to define mental health and illness, understand factors influencing mental health, and describe the history and modern practices of psychiatric care and nursing.