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Behaviour & development · 5 min read

Understanding teenage behaviour

Adolescence rebuilds the brain. The systems driving reward, novelty and social status mature years before the systems that apply the brakes, which is why teenagers can be thoughtful one moment and reckless the next.

What is developmentally expected

Pulling away from parents, intense friendships, strong opinions, a later body clock and a keen sensitivity to embarrassment are all normal. Teenagers genuinely need more sleep than adults while naturally falling asleep later, which is why mornings are hard.

Staying connected through conflict

  • Negotiate boundaries rather than announcing them - teenagers accept limits they helped set.
  • Pick the two or three rules that really matter and let smaller battles go.
  • Talk side by side, in the car or on a walk, rather than face to face.
  • Respond to the feeling before the facts; advice lands better after the feeling is heard.
  • Keep phones out of bedrooms overnight as a household rule, including for adults.

Signs that go beyond typical adolescence

Withdrawal from everything they once enjoyed, a marked drop in school attendance, changes in eating, self-harm, hopeless talk, or sudden changes in friendship group and mood are worth taking seriously. Undiagnosed ADHD and autism also frequently surface in the teenage years, especially in girls who have masked successfully at primary school.

This article is general information and does not replace personal medical advice. To discuss your child, call 01926 624 235 or send us an enquiry.

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Open to new patientsUpdated March 2026

ADHD assessments, autism assessments and combined ASD/ADHD assessments are all currently bookable.

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