Your eight-year-old has had a stomachache every school morning for a month. Your fourteen-year-old has stopped coming down for dinner and answers every question with a shrug. Your four-year-old's meltdowns seem longer and louder than those of every other child at the park. Almost every parent has a moment like this, and most of the time the answer turns out to be reassuring: children go through rough stretches, and many of them pass with time, patience and a little extra support. Some do not. The hard part is telling the two apart, and doing it without either panicking or waiting too long. This guide explains how professionals make that call, what happens in an assessment, and which treatments have the strongest evidence behind them.
At a glance
- Mental health problems in childhood are common. According to the World Health Organization, about one in seven 10- to 19-year-olds worldwide has a mental disorder, and depression, anxiety and behavioral disorders are among the leading causes of illness in this age group.
- They often start early. A 2022 meta-analysis of 192 studies covering more than 700,000 people found that about a third of all mental disorders begin before age 14 and almost half before 18. For neurodevelopmental conditions such as ADHD and autism, the most common age of onset was around five and a half.
- Anxiety leads the list. In the most recent US national data published by the CDC (2023–2024), 11% of children aged 3 to 17 had a current diagnosis of anxiety, 8% a behavior disorder and 4% depression.
- Help usually arrives late. In a large US survey published in 2005, people who eventually got treatment had waited 6 to 8 years after their first symptoms for mood disorders and 9 to 23 years for anxiety disorders. Problems that start early were the ones most likely to wait longest.
- Treatment works, and parents are central to it. The US National Institute of Mental Health (NIMH) notes that effective therapy for children often involves parents directly, includes practice at home between sessions, and tracks progress over time.
What it is, and what it isn't
The NIMH puts the starting point plainly: "All children are sad, anxious, irritable, or aggressive at times." Many find it hard, now and then, to sit still, to pay attention or to get along with others. These are ordinary parts of growing up, and they tend to come and go with tiredness, hunger, a new school year, a new sibling or a falling-out with a friend.
A mental health condition is different in three ways, and these are the same three questions a clinician will ask you:
- How long has it lasted? A bad week after a move is a reaction. A pattern that has gone on for weeks or longer, and is not easing, deserves a closer look.
- How much distress does it cause? Is your child suffering, frightened or exhausted by it? Is the whole family organizing its days around it?
- How much does it get in the way? Is it stopping your child from going to school, learning, sleeping, eating, keeping friends or doing the things they used to enjoy?
When the answer to all three is "quite a lot", that is the NIMH's threshold for asking a professional. None of these questions is about how difficult your child is to parent, and none of them is about how good a parent you are.
Two more things are worth knowing. First, a diagnosis is a description of a pattern of difficulties, made against agreed international criteria; it is not a verdict on your child's character or future, and it is reviewed as children grow. Second, as the CDC points out, a child can have real symptoms without meeting the criteria for any condition, and still deserves support. You do not need a label to ask for help.
How it can look at different ages
A single sign on its own rarely means much. What matters is a cluster of changes that lasts, upsets your child and gets in the way of daily life. With that in mind, these are the kinds of signs that the NIMH suggests may warrant an evaluation.
- Toddlers and preschoolers (about 2 to 5): tantrums that are very frequent, very long or very intense, or irritability most of the day; fears or worries that stop ordinary activities; little interest in playing with other children; losing skills they had already mastered, such as words or toilet training; persistent sleep problems or frequent nightmares.
- School-age children (about 6 to 11): frequent stomachaches or headaches with no medical cause, especially on school days; being in constant motion and unable to settle, even when they want to; worrying or checking things over and over, out of fear that something bad will happen; difficulty making or keeping friends; a recent drop in grades; refusing to go to school.
- Teenagers (about 12 to 17): losing interest in things they used to love; low energy or sleeping much more or much less than usual; spending more and more time alone and avoiding friends and family; dieting or exercising excessively, or a strong fear of gaining weight; self-harm; using alcohol or drugs; reckless or destructive behavior; periods of unusually high energy with little need for sleep; saying they hear things other people cannot hear; talking about death or suicide.
Notice that many of these signs look like bad behavior from the outside. A child who refuses school may be terrified rather than lazy; a teenager who snaps at everyone may be depressed rather than rude. Looking underneath the behavior is often the first step toward help.
Why it happens
There is almost never a single cause. Professionals think of mental health problems as the result of several layers acting together:
- Biology: genes, temperament and the way a child's brain develops. Many conditions run in families, and some children are simply born more sensitive, more cautious or more impulsive than others.
- Life experience: stress and adversity, such as loss, conflict, bullying, illness, or frightening or traumatic events, can tip a vulnerable child into difficulty.
- Physical health: sleep problems, hearing or vision problems and some medical conditions can produce or worsen emotional and behavioral symptoms, which is why a good assessment includes a health check.
- Environment: school pressures, friendships, online life and the wider family's circumstances all play a part.
If you are wondering whether you caused this: the research does not support that fear. What it does support is that families are a powerful source of protection. The CDC reports that the more positive childhood experiences a child has, such as feeling safe, supported and connected at home and in the community, the less likely they are to have a diagnosed mental health condition. You are not the problem. You are a large part of the solution.
How it is assessed
Start with the people who see your child most. The NIMH suggests beginning by talking with your child's teacher or childcare staff about what they notice, and then with your pediatrician or family doctor. Describe what you have seen at home and what you have heard from others, and ask for a referral to a professional who specializes in children.
Who does what. A child and adolescent psychiatrist is a medical doctor who can diagnose and, where appropriate, prescribe treatment. A clinical psychologist assesses, often with standardized tests and questionnaires, and provides therapy. School counselors and school psychologists can help with what happens in the classroom. Often several of them work together. Only a qualified professional can assess whether your child has a mental health condition; the signs in this guide are a reason to ask, not a conclusion.
What the assessment involves. According to the NIMH, a thorough evaluation usually includes a long conversation with you about your child's development, temperament, relationships, medical history and any earlier help; information from school; and, where useful, time with your child for observation, conversation or testing. Expect questionnaires for you, for teachers and, for older children, for your child. Expect more than one appointment. A careful clinician will also look for physical explanations, such as sleep, hearing or other health problems, before settling on a psychological one.
What to bring. Before the first appointment, spend a week or two writing down what worries you: what happens, how often, how long it lasts, what seems to set it off and what helps. Bring school reports or teacher comments, any earlier assessments, and a list of your questions. Concrete notes are far more useful than a general sense that "something is wrong", and they will stop you forgetting things in the room.
Talk with your child first. The American Academy of Child and Adolescent Psychiatry notes that parents are usually the first to notice a problem, and that the first step is to gently try to talk with your child about it. Tell them, in words that fit their age, why you are seeing someone: "We're going to see someone whose job is to help kids when worries get too big. You're not in trouble."
Treatment: what the evidence supports
Treatment depends on what the assessment finds, and each condition has its own best-supported approach. Across conditions, though, the picture is consistent.
Talking therapies come first for most childhood conditions. These are not open-ended chats. The best-supported therapies are structured, time-limited and specific to the problem: cognitive behavioral therapy for anxiety, depression and obsessive-compulsive disorder; parent training programs for disruptive behavior; trauma-focused therapy after frightening events; family-based treatment for eating disorders. The NIMH notes that effective therapy for children often includes three ingredients: parents taking part, skills practiced at home or school between sessions, and progress measured over time with rating scales.
Parents are often the main agents of change. For younger children especially, much of the work happens through you. Many programs coach parents directly, and some of the most effective treatments for anxiety and behavior problems in young children are delivered almost entirely through parents.
Medication has a place for some conditions. For certain diagnoses, and especially when symptoms are severe, a child psychiatrist may recommend medication, usually alongside therapy rather than instead of it. This is a medical decision you make together with the doctor, with a clear explanation of the expected benefits, side effects and how it will be monitored.
School is part of the plan. Many children benefit from adjustments at school, such as extra time, a quieter seat or a planned way to step out when overwhelmed. Your child's clinicians can help you talk with the school.
Questions to ask any therapist. The NIMH suggests asking: Do you use treatments supported by research? How will parents be involved? Will there be practice between sessions? How will we know it is working, and how soon? How long should treatment last? A good clinician will welcome these questions.
What helps at home
- Keep a short diary for two weeks. Note what happens, when, how long it lasts and what helped. Patterns that feel vague in your head often become clear on paper, and the diary will be the most useful thing you bring to an appointment.
- Open the door gently. Choose a calm moment, side by side rather than face to face, such as in the car or on a walk. "I've noticed you seem really tired and quiet lately. You're not in trouble. I just want to understand how things are for you." Then listen more than you speak.
- Ask the school what they see. A child who is fine at home may be struggling at school, or the other way round. Ask the teacher a specific question: "Have you noticed any change in how she gets on with others, or in her concentration, over the last month?"
- Protect the basics. Regular sleep, regular meals, daily movement and some screen-free time together will not cure a mental health condition, but poor sleep and skipped meals make almost every symptom worse.
- Keep a daily moment of connection. Ten to fifteen minutes a day of one-to-one time, where your child chooses the activity and you simply join in without correcting or teaching, keeps the relationship strong while you work out what is going on.
- Look after yourself, too. Worrying about a child is exhausting. Talk to your partner, a relative or a friend, and get support for yourself if you need it. A calmer parent is better able to help.
Myths and facts
"It's just a phase; they'll grow out of it." Many difficulties do pass, which is why duration matters. But the research on delays is sobering: for anxiety, people often wait many years for help, and early-onset problems wait longest. If something has lasted weeks, is causing real distress and is getting in the way of life, asking is not overreacting.
"A diagnosis will label my child for life." A careful assessment is not a label; it is a map. It tells you, the school and the clinicians what kind of help to offer. Diagnoses are reviewed as children develop, and many children improve so much with treatment that they no longer meet the criteria.
"If I ask my teenager about suicide, I might put the idea in their head." This fear is common and understandable, but a review of 13 studies published in Psychological Medicine in 2014 found that asking about suicide did not increase suicidal thoughts, and that acknowledging them may reduce them. If you are worried, ask directly and calmly.
When to get help right away
Do not wait for an appointment if your child:
- talks about wanting to die, to kill themselves or to hurt someone else, or you find signs that they are planning to;
- is harming themselves;
- seems confused, says they hear or see things other people cannot, or seems out of touch with reality;
- has stopped eating or drinking, is losing weight quickly or is fainting;
- is in any situation where you believe they, or someone else, are not safe.
The NIMH advice is clear: if your child's behavior is unsafe, or they talk about wanting to hurt themselves or someone else, seek help immediately. Call your local emergency number or go to the nearest emergency department, and stay with your child.
In one sentence
When a change in your child has lasted for weeks, is causing real distress and is getting in the way of school, home or friendships, it is time to ask a professional, and asking early is a sign of care, not an overreaction.
Sources
- National Institute of Mental Health (NIMH), "Children and Mental Health: Is This Just a Stage?", fact sheet
- World Health Organization, "Mental health of adolescents", fact sheet
- Solmi M. et al., "Age at onset of mental disorders worldwide: large-scale meta-analysis of 192 epidemiological studies", Molecular Psychiatry, 2022
- Centers for Disease Control and Prevention (CDC), "Data and Statistics on Children's Mental Health", 2026
- Wang P.S. et al., "Failure and delay in initial treatment contact after first onset of mental disorders in the National Comorbidity Survey Replication", Archives of General Psychiatry, 2005
- American Academy of Child and Adolescent Psychiatry (AACAP), "When To Seek Help For Your Child", Facts for Families No. 24
- Dazzi T. et al., "Does asking about suicide and related behaviours induce suicidal ideation? What is the evidence?", Psychological Medicine, 2014