The document discusses several health issues that teenagers may face, including effects of excessive gadget and internet use such as headaches, eye defects, obesity, aggression and mental health problems. It also discusses issues like alcohol and drug use, bullying, negative body image, family problems, suicide, teenage pregnancy and sexual relationships. The last sections provide tips for becoming a healthy teenager like eating healthy, exercising, managing sleep, hygiene and social relationships as well as signs of internet addiction.