This document discusses mental health and mental illness. It begins by defining mental health and describing common and less common mental health problems. It then discusses the significance of mental health, noting that nearly half of people worldwide experience mental illness. The document outlines stigma associated with mental illness and describes experiences of stigma. It discusses etiology and contributing factors of mental illness, classification of mental disorders, signs and symptoms, prevention, and treatment including medication, psychotherapy, electroconvulsive therapy, hospitalization, and community support programs. It provides an overview of mental health services and programs in India.