Mental health includes our emotional, psychological, and social well-being. It affects how we think, feel, and act. It also helps to determine how we handle stress, relate to others, and make choices. Mental health is important at every stage of life, from childhood and adolescence through adulthood. A mental illness is a broad term which encompasses a wide variety of conditions which affect the way you feel and think. It can also affect your ability to get through day-to-day life. Mental illnesses can be influenced by several different factors, including: genetics, environment ,daily habits, biology.