Health Psychology (Swasthya Manovigyan) is one of the most crucial emerging branches of Psychology. This book helps in understanding how to maintain their health, and well-being and guard against illness. This book contains twenty-five chapters covering all aspects of health, well-being, and illness with excellent, revised, and updated study materials such as Modern theories of health psychology, Health behaviour and approach, Well-being, Mental health, Stress and management, Alternative therapies for health and well-being, Illness: Cancer, HIV/AIDS, Heart disease, Hypertension/High blood pressure, Diabetes, Pain, Obesity, Eating disorder, Depression, Osteoporosis, Thyroid, Paralysis, Unsafe sexual behaviour, Phobia, Menopause, Drug addiction, and Alcoholism. All chapters are relevant to the current scenario and provide an essential understanding and guidance about health, well-being, and illness.