How do I tell the difference between normal teenage moodiness and something more serious?

Duration, intensity, and number of areas affected. Two grumpy weeks is normal. Six weeks of withdrawal, sleep change, eating change, and dropping friends is not. If more than one area of life has shifted and it has lasted more than a fortnight, treat it as worth a GP appointment.

Should I read their messages without asking?

There is a narrow case for it — when you have a specific, serious safeguarding worry and no other way to assess risk. Even then, prefer asking first and reading together. Covert reading, if discovered, often ends the disclosure relationship you most need.

I'm worried but my partner thinks I'm overreacting. What now?

Book a GP appointment anyway. It costs nothing to be wrong and a lot to be right and ignored. The GP can also help mediate the disagreement at home.

Urgent

Your Child Has Suddenly Become Withdrawn and Secretive

A noticeable change in mood, withdrawal, secrecy about devices. It can be many things — here is how to think about it carefully.

If your child is in immediate danger, call 999

For urgent reports of online grooming, sextortion, or contact with an unknown adult, you can also report to CEOP. For child sexual abuse imagery, report to IWF.

What might be happening

Something has changed and you cannot quite name it. Your child has gone quieter, more irritable, more secretive with their phone. They flinch when you walk into the room while they are on a device. They are sleeping badly, eating differently, dropping hobbies, or pulling back from friends. This could be many things — a friendship fall-out, school stress, the beginnings of mental ill-health, normal pre-teen change, a bereavement they have not talked about, identity questions, or yes, sometimes something that started online. It is genuinely hard to tell from the outside.

How serious is it?

Treat the change seriously without leaping to the worst conclusion. Most behaviour shifts in children and teens have ordinary explanations and resolve with time and gentle attention. A minority signal something that needs adult intervention — bullying, abuse, grooming, self-harm, an eating problem, depression. The way to find out which is the case is patient curiosity, not interrogation, and the right professional support if your gut tells you something is wrong.

What to do first

Step 1

Write down what you have noticed — when it started, what has changed, what triggers it. Patterns are easier to see on paper. Two weeks of notes is more useful than one heated conversation.

Step 2

Make low-key time together where talking is optional — a car journey, walking the dog, cooking. Children disclose sideways far more often than head-on.

Step 3

Ask open questions, not yes/no ones. "How have things been at school lately?" "What's the group chat like at the moment?" Then stop talking and let the silence work.

Step 4

Speak to one other adult who knows them — the other parent, the form tutor, a coach, a grandparent. Are they seeing the same thing? A second observer helps you calibrate.

Step 5

Check in with your GP. You do not need a confirmed problem to book an appointment about a child whose mood has changed. The GP is the right first port of call for many things and can refer onward.

What to say

Phrases that help

"I've noticed you've been a bit different lately. I'm not asking for an explanation — I just want you to know I'm here when you want one."
"Whatever is going on, you are not in trouble. You will not lose your phone for telling me about something."
"If it's something you'd rather tell someone who isn't me, Childline is 0800 1111 and they are good. I'll still be here when you're ready."

What not to say

✗"Why are you being like this?" — accusatory, gets a shrug.
✗"I bet it's that phone, isn't it?" — premature blame on devices misses other causes.
✗"You used to be such a happy kid." — adds guilt to whatever else they are carrying.

Settings to check

•If you suspect the phone may be involved, glance — do not raid — at recent screen time reports (Settings → Screen Time on iPhone, Family Link on Android). A sudden spike in messaging apps or new app installs is information.
•Look at who they are messaging most. New contacts that did not exist a month ago are worth noticing.
•Check the school's online-safety lead is aware of any class-level issues (bullying, group chats falling out).
•Keep the device's location sharing on if it already was — not to spy, but so you know where they are.

When to escalate

Talk to your GP if the change has lasted more than two weeks or is getting worse. Talk to the school's safeguarding lead if you suspect anything school-related. Talk to the NSPCC helpline (0808 800 5000) if you suspect any form of abuse or grooming. If your child mentions suicide, self-harm, or you are worried about their immediate safety, contact Samaritans (116 123), text Shout (85258), or take them to A&E. If they disclose something criminal that has happened to them, dial 101 (or 999 if in immediate danger) and contact CEOP (https://www.ceop.police.uk). It is not your job to diagnose — it is your job to notice and to bring in help.

Frequently Asked Questions

Last reviewed: 2026-05-16 · This page is educational guidance, not a substitute for emergency services, safeguarding professionals, or legal advice.

This is practical educational content to support families. For case-specific concerns about a child's safety, contact the NSPCC helpline on 0808 800 5000 or your local safeguarding team.