Is My Teenager Depressed or Is It Just a Phase? How to Tell, for Boys and Girls

My answer: not every low mood is depression. Most of what you see is a passage: your child moving from one stage of life to the next, with a body that is changing and a future that feels uncertain. It becomes depression when it stays too long and keeps getting heavier. Watch the length, not the bad day.

Every new stage starts with fear

Children don’t grow in a straight line. They cross bridges. From early childhood to later childhood. From later childhood to the teenage years. From the teenage years to being a young adult.

At the start of each crossing there is fear of what’s coming, and a body that changes before the mind has caught up. Think about how it feels from the inside:

“My body is changing. I’m slower and heavier than I used to be. I used to jump and run all day, and now things are showing on my body that I’m not used to. My mood goes up and down and I don’t know why.”

That is not illness. That is growing up. And it happens to boys and girls alike.

Boys and girls

Boys often go quiet. They spend more time in their room, sleep more, speak in one word, and get angry faster. Their voice changes, their body grows in jumps, and many feel clumsy in it. Few of them will tell you they’re afraid.

Girls often go through the changes earlier and more visibly, and they feel watched: by friends, by mirrors, by the phone. The body changes are bigger and come with more questions. A girl who was carefree at nine can be anxious about her body at twelve. See My Daughter and Her Body.

For both: tell them early that these changes are normal, before they happen. A child who knows what’s coming is less frightened when it comes.

The line: when does it become depression?

My rule: if it keeps growing, if it lasts beyond its limit, it’s no longer a passage.

Official guidance draws the same line. A fact sheet from the Sydney Children’s Hospitals Network says: “Depression is more than feeling sad or moody following a bad day,” and “Normal feelings of being sad, “down” or “blue” usually do not last long.” It adds: “If children’s feelings of sadness and depression continue for more than two weeks, parents should begin to be concerned” (Sydney Children’s Hospitals Network).

The same sheet says: “The most important sign of a depressive illness in children is persistent unhappiness.” It lists other signs, including:

• “Sleep may become disturbed”
• “Weight and appetite changes”
• “Difficulties with concentration and remembering”
• “Bad times of the day”
• “When bad thoughts keep coming”

A simple way to look at it:

A passage	Worth a closer look
Moody, but still laughs some days	Low almost every day
Comes and goes	Lasts more than two weeks
Still sees some friends	Drops friends and things they loved
Grumpy about school	Can’t concentrate, grades fall
Tired	Sleeps far too much, or can’t sleep

If your teen talks about hurting themselves or not wanting to live, don’t wait two weeks. The guidance says “parents need to make sure their child is not left alone,” and “If parents feel unable to keep them safe, they should take them to their family doctor or hospital.” See Signs of Self-Harm in Teenagers. The help lines are at the bottom of this page.

How to talk about it

Very simply. No big sit-down, no worried face.

“The changes you’re going through are normal. Everyone goes through them. Your body is changing and your mood goes up and down. That’s not you being weak, it’s you growing.”

With a daughter, especially, talk about the changes openly: her body, her feelings, her personality. Then go further than the body: who she is, what she’s good at, what kind of person she wants to be. With a son, the same, often side by side rather than face to face: in the car, on a walk, fixing something together.

Then do things together. Go out. Spend time as friends, not only as parent and child. Talk about small things so the big things have a road to travel on. The guidance agrees: encourage them to “spend time with supportive friends” and “do exercise that is non-competitive.”

If it has gone past the line

• Talk to them first. “I’ve noticed you’ve been down for a while. I’m not angry. I want to help.”
• See a doctor. Your teen’s doctor can assess it and connect you to support. Depression is treatable.
• Keep the house steady. Regular meals, sleep times, a walk together. Small structure helps.
• Don’t take the words personally. A depressed teen may push you away. Stay close anyway.

What hurts a low teen

• “What do you have to be sad about?” Sadness doesn’t need permission.
• “Pull yourself together.” If they could, they would.
• Comparing: “Your cousin isn’t like this.”
• Mocking their body or their mood, even as a joke.
• Ignoring it for months in the hope it passes.

For the day-to-day ups and downs, see Teen Mood Swings: What Is Normal and When to Worry.

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Next step

For the next two weeks, note each evening: was today mostly up, mostly down, or mixed? If most days are down, book the doctor. Before you talk → What to say →