Mental health includes our emotional, psychological, and social well-being. It affects how we think, feel, and act. It also helps determine how we handle stress, relate to others, and make healthy choices. — Editor: This is the first installment of my four part series, Mental Health & Well-Being. Mental health affects how we think, feel, and act in everyday life. It also helps us cope with stress, build relationships, make decisions, and manage difficult situations.