The document discusses mental health and mental illness. It defines mental health as maintaining successful mental activity and fulfilling relationships while adapting to change. Mental illness occurs when the brain is not functioning properly, disrupting thinking, emotions, behavior, or physical functioning. Common symptoms include sleep problems, mood swings, and difficulty focusing. Mental illness is caused by a complex interplay between genetics and environment and results in abnormal brain functioning. While some illnesses begin in childhood, others often emerge during adolescence. Most people with mental illness can live productive lives with treatment. The document encourages seeking help from others if experiencing prolonged sadness, anger, or risky behaviors.