The teenage years can be challenging for both young people and their parents. Teenagers naturally become more independent, their moods can change and friendships often become increasingly important. These changes do not necessarily indicate a problem.

However, parents may sometimes notice changes that seem more significant or persistent. While no single sign proves that a teenager is misusing alcohol or drugs, understanding what to look for can help parents recognise when it may be time to have a conversation or seek professional advice.

Changes in Behaviour

One of the most noticeable signs may be a significant change in behaviour. A teenager who was previously sociable might become withdrawn, secretive or unusually defensive.

They may suddenly lose interest in activities they previously enjoyed or spend time with a different group of friends. Changes in sleeping patterns, eating habits or general motivation can also occur.

It is important to remember that these behaviours can have many causes, including stress, friendship problems, anxiety, low mood or difficulties at school. They should therefore be viewed as potential indicators rather than proof of substance misuse.

Changes at School or College

A noticeable change in educational performance can sometimes be another warning sign. This could include falling grades, missed homework, poor attendance or a loss of interest in school or college.

Parents may also hear concerns about behaviour, concentration or relationships with teachers and classmates.

Again, there can be many explanations for changes in academic performance, so it is worth considering the wider picture rather than immediately assuming substance use is involved.

Physical Signs

Some forms of substance misuse can produce physical changes. These might include unusually tired or sleepy behaviour, bloodshot eyes, changes in appetite or unexplained changes in weight.

Parents might also notice that a teenager appears unusually energetic, restless or confused at certain times.

Physical signs can vary considerably depending on the substance, how it is used and the individual. They can also be caused by ordinary teenage issues such as lack of sleep or illness, which is why one isolated symptom should not automatically cause alarm.

Money and Possessions

Unexplained changes involving money can sometimes be worth paying attention to. A teenager may begin asking for additional cash, appear to have money that cannot be accounted for or start selling possessions.

Missing money or valuables at home may also raise concerns.

Rather than immediately making accusations, parents can ask calmly about what they have noticed. A straightforward conversation may reveal an entirely different explanation, while also creating an opportunity to discuss alcohol and drugs.

Changes in Friends and Social Life

Friendships naturally change during adolescence, so having new friends is not necessarily a cause for concern. However, a sudden change in social circles combined with secrecy, unexplained absences or changes in behaviour may warrant a closer look.

Parents should try to remain interested in their teenager's social life without becoming overly intrusive. Maintaining a relationship based on trust can make it easier for young people to talk if something is worrying them.

How Should Parents Respond?

If you are concerned about your teenager, try to choose a calm moment to talk. Avoid starting the conversation when either of you is angry or when you suspect they may be under the influence of a substance.

Use open questions and explain what you have noticed without making accusations. For example, you might say that you have noticed they seem withdrawn recently and ask whether everything is alright.

Most importantly, listen to their response. If substance misuse is suspected or confirmed, consider seeking advice from a GP, school or college safeguarding team, or an appropriate specialist service.

Recognising possible warning signs is not about spying on or judging a teenager. It is about noticing when something may have changed and making sure they know that there is treatment for ketamine addiction, alcohol and other hard substances. A calm, supportive conversation can be an important first step towards getting the right help.