Teenage Crisis: Normal Behaviour or Warning Signs to Watch?

Lucas is 15. For several months now, he has been slamming doors, rolling his eyes whenever anyone speaks to him, and spending most of his free time shut in his bedroom. His mother is worried. His father plays it down: "It's just his age, it'll pass." But where exactly is the line between a turbulent but normal adolescence and genuine distress that deserves serious attention?

As a psychotherapist specialising in cognitive behavioural therapy, I regularly support families facing precisely this question. And I can tell you that the answer is never as simple as "it's normal" or "it's serious". Adolescence is by nature a period of upheaval. But some signals must not be dismissed on the grounds that "it's just their age".

This article gives you clear landmarks to distinguish normal turbulence from warning signs, and to know when it is time to consult a professional.

Adolescence: a neurological and identity revolution

Before addressing what is normal and what is not, it is essential to understand what is happening in a teenager's brain. Adolescence is not simply a "crisis": it is a profound transformation.

A brain under construction

Neuroscience has clearly shown that the adolescent brain is undergoing full restructuring. The prefrontal cortex — the area responsible for reasoning, planning, impulse control and decision-making — only reaches full maturity at around 25 years old.

Meanwhile, the limbic system, the seat of the emotions, is already fully active. This maturation gap creates a fundamental imbalance: the teenager experiences emotions of considerable intensity but does not yet have the neurological tools to regulate them effectively.

That is why teenagers' emotional reactions often seem disproportionate to us. It is not provocation: it is neurology.

The individuation process

Psychologically, adolescence corresponds to the individuation process: the young person must separate psychologically from their parents in order to build their own identity. This process, described as early as the 1960s by Peter Blos, necessarily goes through a phase of opposition, of questioning family values and of seeking autonomy.

It is a healthy and necessary process. Without this phase of separation, the teenager could not become an autonomous adult.

Normal changes in adolescence

Mood fluctuations

Teenagers go from laughter to tears, from enthusiasm to dejection, sometimes within a few hours. These emotional roller-coasters are the direct result of hormonal upheaval and of the immaturity of the prefrontal cortex.

What is normal:

• Mood swings that vary during the day
• Increased irritability, especially at the end of the day or after school
• Moments of passing sadness after a disappointment (with friends, in love, at school)
• A tendency to dramatise ("This is the worst day of my life!")

It is normal as long as: the teenager still has moments of good humour, continues to engage in at least a few activities and maintains social ties (even if they have changed friendship groups).

The need for autonomy and privacy

A teenager who closes their bedroom door, who no longer wants to recount their day in detail, who would rather go out with friends than join the family on Sunday: all of this is perfectly normal.

What is normal:

• Wanting more privacy (closed door, diary, password-protected phone)
• Preferring friends to family for certain activities
• Developing interests different from their parents'
• Questioning family rules

This need for autonomy is a sign of healthy development. The teenager is testing their own limits and those of their environment in order to define themselves.

Opposition and provocation

Challenging parental authority is an almost inevitable stage of adolescence. The teenager argues, negotiates, criticises — sometimes clumsily or hurtfully.

What is normal:

• Challenging rules through argument (even when the arguments are shaky)
• Expressing disagreement about clothing, music or food choices
• Testing limits (coming home a little later than agreed, negotiating curfews)
• Idealising other adults (a teacher, a friend's parent, a public figure)

Warning signs: when the crisis goes beyond normal

While the behaviours above are part of the normal process, certain behaviours should alert parents. The main criterion is always the same: duration, intensity and impact on daily functioning.

Prolonged isolation

There is a fundamental difference between a teenager who withdraws to their room to listen to music or chat with friends online, and a teenager who cuts themselves off from all social contact.

Warning signs:

• Breaking away from the usual friendship group without forming new ties
• Refusing to leave their room for several days
• Dropping all extracurricular activities
• No communication with the family, not even minimal
• Total loss of interest in things that used to excite them

Isolation lasting more than two weeks and accompanied by a break with peers deserves serious attention.

Self-harm and risk-taking behaviours

This is the most urgent signal. Self-harm (cutting, burning, hitting oneself) is never a "normal" phenomenon of adolescence, even if it is unfortunately common. According to studies, between 15 and 25% of teenagers have had at least one episode of self-harm.

Warning signs:

• Unexplained cuts, burns or bruises
• Wearing long sleeves in all seasons to hide arms or legs
• Repeated risk-taking behaviours (heavy drinking, substance use, physical risk-taking)
• Verbalising suicidal thoughts, even jokingly ("Everyone would be better off if I weren't here anyway")

If your teenager mentions suicidal thoughts, seek help immediately. In France, you can call 3114 (the national suicide prevention line) or go to A&E. In the United Kingdom, contact Childline on 0800 1111 or the Samaritans on 116 123. Anywhere else, find a helpline in your country at findahelpline.com.

Academic decline

A temporary drop in school results is common in adolescence, particularly when moving up to secondary school or changing class. But a sudden and lasting collapse in performance should draw attention.

Warning signs:

• A sharp, sudden drop in grades (losing several points of average within a few weeks)
• Repeated and unexcused absences
• Refusing to go to school accompanied by physical complaints (stomach aches, migraines)
• Total loss of motivation and school engagement

Academic decline is often the visible symptom of a deeper distress: school bullying, anxiety, depression or school phobia.

Eating disorders

Adolescence is a period in which the relationship with the body changes profoundly. Some concern about appearance is normal. But extreme eating behaviours are worrying.

Warning signs:

• Rapid and significant weight loss or gain
• An obsession with calorie counting or restrictive diets
• Meals systematically skipped or eaten in secret
• Trips to the bathroom immediately after meals
• Compulsive and excessive physical exercise

Eating disorders affect around 5% of teenagers and require specialist care. The earlier they are detected, the better the prognosis.

When to consult a professional

The question parents ask me most often is simple: "Is it worth consulting, or will it pass on its own?" Here are my clinical landmarks.

Consult if you observe:

Excessive duration: the symptoms have persisted for more than two weeks without improvement

Worrying intensity: emotional reactions are disproportionate and frequent

Functional impact: the difficulties affect schooling, social relationships or family life

A break with how things used to be: your teenager has fundamentally changed and you no longer recognise them

Your parental intuition: never underestimate your gut feeling. If something worries you, that is already reason enough to consult

Which professional should you see?

A psychotherapist trained in CBT is particularly well suited to supporting teenagers, because cognitive behavioural therapies are the most studied and scientifically validated approaches for anxiety and depressive disorders in adolescents.

The first session comes with no commitment and allows the situation to be assessed. If you would like to talk about it, feel free to book an appointment.

The CBT approach with teenagers

Cognitive behavioural therapies are particularly well suited to adolescents, for several reasons.

Identifying automatic thoughts

The teenager learns to identify their negative automatic thoughts: "Nobody likes me", "I'm useless", "There's no point trying". In CBT, we do not seek to eliminate these thoughts but to examine them objectively: what is the evidence that "nobody" likes me? Does "useless" match the reality of my abilities?

This Socratic questioning approach is often very well received by teenagers, who are naturally in a questioning stance.

Emotion regulation

Emotion regulation exercises (abdominal breathing, progressive muscle relaxation, mindfulness) give the teenager concrete tools to manage emotional waves. That is exactly what their maturing prefrontal cortex needs: explicit strategies to compensate for what the brain does not yet do automatically.

Graduated exposure

For teenagers who avoid certain situations (social, academic, family), graduated exposure helps them regain confidence step by step. The principle is simple: we gradually face what frightens us, starting with the least anxiety-provoking situations.

You can also take an online test to better understand your teenager's psychological profile and prepare for a possible consultation.

What parents can do day to day

While waiting for, or alongside, professional support, here are some concrete suggestions:

• Keep the connection alive: even if your teenager pushes you away, keep showing them that you are there. A note slipped under the door, a favourite meal cooked, a simple silent presence
• Avoid interrogations: favour informal moments (in the car, in the kitchen) to open up dialogue. Discover our tips for restoring communication
• Validate emotions: "I can see you're angry" is more useful than "Stop getting worked up over nothing"
• Set a clear framework: opposition needs a framework to push against. Clear and consistent rules are reassuring
• Take care of yourself: supporting a suffering teenager is exhausting. Your own balance is essential. Do not hesitate to seek help for yourself if needed

Conclusion: between vigilance and trust

The teenage crisis is a necessary and healthy passage in human development. The majority of teenagers go through this period with turbulence, certainly, but without lasting damage. The role of parents is not to prevent the crisis but to accompany it with a subtle balance of firmness and kindness.

Nevertheless, some signals must not be ignored. Prolonged isolation, self-harm, academic decline and eating disorders are alerts that deserve professional assessment. Consulting does not mean you have failed as a parent: it means you are taking your child's suffering seriously.

If you are concerned about your teenager's behaviour, I invite you to get in touch to discuss it. An initial assessment often helps clarify the situation and determine whether support is needed. You can also discover our support programmes designed specifically for families.

Adolescence is a storm. But every storm eventually passes — especially when it is not faced alone.

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FAQ

How do I know whether I am going through a teenage crisis and not simply a bad day at work?

Tell a normal teenage crisis apart from serious warning signs. The clearest markers are persistent self-doubt that did not exist before, physical stress symptoms specifically tied to the work environment, and a growing inability to trust your own perception of reality.

What legal remedies are available to victims of a teenage crisis?

Legal frameworks vary from country to country, but most recognise psychological harassment at work where the conduct is systematic, creates a hostile environment and affects health or dignity. Documenting incidents with dates, quotes and witnesses is the essential first step before approaching human resources, occupational health or legal counsel.

Can CBT help someone recover from the psychological effects of a teenage crisis?

Yes. CBT is particularly effective because it directly targets the cognitive distortions induced by toxic environments — especially self-doubt and internalised guilt. A protocol of 8 to 12 sessions can restore an accurate self-perception, rebuild professional confidence and prevent similar dynamics from recurring.