What Is Mental Health & Why It Matters Defining Mental Health Mental wellness health is not simply the absence of mental illness—it refers to a person’s overall emotional, psychological, and social well-being. It impacts how we think, feel, act, handle stress, relate to others, and make life choices. Why It’s Important Strong mental health: Supports resilience during life’s challenges Boosts performance at work or school Enhances relationships Improves physical health through better sleep, immunity, and energy levels Mental Health ...