Teenage depression: telling it apart from ordinary mood swings

“He’s a teenager. They’re all like that.”

I hear that sentence often. Sometimes it comes from a father who is worried and would like me to reassure him. Sometimes from a mother who heard the same sentence from her own mother, and back then it helped. And often the sentence is right. A fifteen-year-old who doesn’t speak to anyone for three days, then goes out with friends on Saturday evening and comes home laughing, is not depressed. He is a teenager.

The trouble is that the same sentence also closes doors that ought to be opened. Because adolescent depression really does hide behind something that looks, from the outside, like ordinary ups and downs – and because parents have no reason to know how to tell one from the other. Nobody taught them. In this piece I want to say where the difference lies, because I think it is more tangible than it seems.

Why the swings really are bigger at this age

Between eleven and twenty the brain is rebuilt more thoroughly than at any time since the first three years of life. The limbic system – the part that drives emotional response, reward and arousal – matures relatively early. The prefrontal cortex, which calms that response, weighs consequences and holds attention, keeps maturing well into the twenties. So a few years pass in a state where the accelerator is stronger than the brake.

On top of that, the internal clock shifts. In puberty melatonin release is delayed by an hour or two, which means that at ten in the evening a teenager is simply not yet physically sleepy. School still starts at eight. And chronic lack of sleep is by itself enough to make anyone irritable, emotionally thin-skinned and poorly focused – whether they are depressed or not.

So it is true: the swings at this age are bigger, faster and more dramatic. A fifteen-year-old can cry over a grade and laugh at a video clip within the same hour. That is not an illness. That is development.

Where the line runs, then

When I try to draw that line with parents in my room, I don’t look at a single day. I look at four things: how long this has lasted, how many areas of life it has taken over, whether the capacity to function has changed, and – most importantly – whether the state still responds to good things at all.

Ordinary teenage moodiness has one quality that depression loses: permeability. The mood is low until something good happens. Then it opens. Depression has no such permeability. A friend comes over, the trip goes well, the grade is good – and inside nothing moves. For parents, that difference is often more tangible than any list of symptoms.

One question I put to almost every parent is useful here: when did you last see him enjoying something properly? If the answer comes quickly – last weekend, at the concert, when his cousin visited – that is good news, and it means the reward system is still working. If the parent pauses and then says they can’t really answer, because the last month has all been the same shade of grey, that single fact weighs more than ten lists of warning signs.

Why it looks different in a teenager than in an adult

An adult in depression is often slowed down, quiet, sad in a way we recognise. A teenager is often angry. Irritability is such a common form of depressed mood in young people that diagnostic manuals list it as equivalent to sadness – something they do not do for adults.

For a family this is a cruel substitution. A child who is submerged inside behaves outwardly in a way that repels precisely the people who could help. He slams the door. He says something he doesn’t mean. The parent withdraws, hurt or exhausted – and the teenager reads that as confirmation of what his own head is already telling him: that he is a burden. I have written about how a symptom often performs a job within a relationship in the piece on what a symptom is saying.

The signs parents most often miss

Withdrawal from activities he used to love is the most reliable one. I don’t mean a seventeen-year-old giving up the piano – tastes change. I mean something that was the centre of his week for three years emptying out within a month, with nothing arriving in its place.

The second is a drop at school that is not a drop in effort. The teenager sits at the desk, stares at a book for forty minutes and reads nothing, because concentration scatters. The parent sees laziness. The child experiences having suddenly become stupid – and doesn’t say so, because he is ashamed.

The third is sleep. In adults depression often means waking early in the morning; in teenagers it more often shows up as oversleeping that never restores, or as a completely inverted rhythm. If a body that won’t settle at night sounds familiar, I have written about this mechanism before: the body stays switched on even when the person is exhausted.

And the fourth, the quietest: physical symptoms. Headaches, stomach aches, fatigue, pain with no finding. The younger the child, the more likely distress will be spoken through the body rather than through words. This is not made up and it is not manipulation – I have written about what it means when the test results are fine but the trouble stays.

Self-harm, and the question parents dread

Many parents know or suspect that their child is hurting themselves, and have no idea what to do with that. Let me say this first: self-harm is not the same as a suicide attempt, and in the great majority of cases it is not aimed at ending a life. Most often it is a makeshift way of regulating an unbearable feeling in someone who has no other way yet. Which does not mean it is harmless or that it should be left alone – it means only that panic is not the best first response.

Second: asking a teenager directly whether he is thinking about taking his own life does not plant the idea. That fear is very widespread and research does not support it; on the contrary, an open question often brings relief, because the child sees for the first time that it is possible to speak about it at all. Ask calmly, without horror on your face, and be ready to hear the answer. If the answer is yes, that is not a moment for negotiation – it is a moment for a doctor, an emergency department, or one of the numbers above.

What therapy does, and where my role ends

In adolescent depression, cognitive behavioural therapy and interpersonal therapy for adolescents have the strongest evidence, and in moderate to severe cases a combination of psychotherapy and medication often works better than either alone. As a marriage and family therapist I work mainly with what happens between people: how the family responds, where the conversation stopped, what each of them thinks the other thinks. With a teenager this is often very effective, because a young person’s mood and the family climate hold each other in a loop.

But I do not diagnose and I do not prescribe. If signs point to a more serious picture – marked weight loss, complete collapse of functioning, thoughts of death – the first address is a paediatrician or a psychiatrist, not a therapist. I have written about when a doctor is the first and not the last stop in the piece on when to see a psychiatrist first.

Where this distinction does not hold

Now the part I find most awkward to write: the four criteria above are an aid to conversation, not an aid to judgement. They have serious holes.

First: a teenager who is deeply affected can still function normally. Excellent grades, training sessions, the look of a well-organised child – and complete emptiness inside. High functioning is common in young people, because they have a lot of structure carrying them even when they could not carry themselves. The “function” criterion will miss him.

Second: two weeks is not a sacred threshold. A child who has been submerged for ten days does not become worthy of attention only on day fourteen. The threshold exists so that we don’t pathologise every bad week, not so that we wait.

Third, and most serious: in grief, after a hard event, during a serious physical illness or after a move, these criteria will show depression even where the distress makes complete sense. I have unpicked the difference between sadness and depression in the piece depression is not sadness. So these criteria do not tell you what your child has. They tell you only whether it is time for someone to look.

How to start the conversation without the door closing

The commonest mistake is not the wrong word. The commonest mistake is that a parent asks a question and, at the first “I don’t know”, either gives up or starts offering solutions. The teenager very quickly concludes that the conversation was not an invitation but an inspection.

Something else I have learnt in the room: a teenager often answers not you but your face. If you recoil at his answer, correct him, explain, or start to cry, he has learnt that his truth costs you too much. Next time he will say less. Calm presence is more useful here than the right words.

What a parent can do while waiting

Waiting lists in Slovenia are long and that is no small matter. In the meantime, two things are not small either.

The first is sleep: moving evening screens, a fixed waking time including at weekends, morning light. This is not home treatment for depression, but it removes one factor that makes everything worse.

The second is movement and contact with people, in the smallest possible form. Not “sign back up for football”, but “let’s walk round the block for ten minutes”. For a teenager with no energy, the only offer he can accept is the one that looks ridiculously small.

And a third, which is actually the hardest: look after yourself. A parent who lives in tension for months with nobody to talk to will collapse before the child does. I have seen families where the first real shift came when the parents stopped arguing about who was right about their son and started talking about how each of them was doing. A child registers that change in the air of the house, even without hearing a word of it.

What to remember

Ordinary teenage moodiness is permeable – a good day opens it. Depression is more like a closed room: the good day arrives and changes nothing. Look at duration, reach, function and that permeability, not at a single day.

In a teenager, expect anger rather than tears. Irritability is often the face of depression at this age, and it pushes away exactly the people who could help.

Asking about suicidal thoughts is not dangerous. Silence is. Ask directly, calmly, and be ready to hear the answer.

And finally: you are not obliged to know whether this is depression. That is not your job. Your job is to notice that something has lasted too long, and to bring your child to someone who knows how to look. If you are wondering who, I have written about how to choose a therapist.