Teenagers' behaviour can be baffling, stressful, hurtful and often worrying. But in most cases it does not mean there is anything more serious going on than the natural process of becoming an adult. Many of the common behaviour issues that parents find hard are an essential part of puberty and growing up. Surges of hormones, combined with body changes, struggling to find an identity, pressures from friends and a developing sense of independence, mean the teenage years are a confusing time for your child.