The document discusses common mental health disorders in adolescence such as anxiety, depression, and ADHD. It defines anxiety as feeling worry or nervousness, depression as a constant feeling of sadness, and ADHD as having issues with hyperactivity, impulsivity, and self-control. The document also mentions eating disorders like anorexia nervosa and bulimia nervosa. It distinguishes between eustress, which is a positive form of stress that benefits health, and distress, which involves great mental or physical suffering. Finally, it lists and reorders examples of life events that can cause eustress or distress.