Is It Just a Phase? Recognising the Signs of Mental Health Struggles in Children & Teens
Parents are often the first to notice when something shifts in a child — but knowing when worry becomes a warning sign can feel uncertain. Here is what the research tells us to look for.
Key Highlights
Why It Matters
The Silent Struggle Behind Childhood's Brightest Faces
Mental health challenges in childhood don't always look like a breakdown. They wear the mask of moodiness, stomach aches before school, a sudden disinterest in a favourite sport, or a teenager who just seems… quieter than usual. Because children rarely have the vocabulary — or the safety — to say "I'm not okay," the burden of recognition falls on the adults around them.
This matters enormously. The Canadian Mental Health Association (CMHA) Ontario notes that roughly 70 percent of mental health challenges have their roots in childhood or youth — meaning the window for early, effective support is wide open for a short time. Missing it doesn't just mean a harder adolescence; it shapes the entire arc of a person's life.
"When children and youth have symptoms of a mental illness, they need their parents to respond in the same way as they would to a physical illness."
— CMHA Ontario & Ontario Government, Child and Youth Mental Health: Signs and Symptoms
The comparison to physical illness is deliberate and clarifying: no parent hesitates to take a child with a broken arm to the emergency room. Yet a child visibly withdrawing from life, erupting in anger, or voicing hopelessness is far too often met with "it's just a phase." Changing that default response is, quite literally, a matter of life and wellbeing.
Detailed Viewpoint
What the Signs Actually Look Like — and Why They're Easy to Miss
Children and teenagers aren't small adults. Their emotional language is embedded in behaviour — and many of the signals of distress overlap with ordinary developmental phases. What separates a rough week from something that warrants attention is pattern, persistence, and departure from a child's normal baseline.
Changes in Feelings
Persistent unhappiness, worry, anger, fearfulness, hopelessness, or a deep sense of rejection that doesn't lift after a few days. These emotional shifts may be more visible to teachers than to parents.
Changes in Thinking
Persistent negative self-talk, difficulty concentrating, low self-esteem that goes beyond a passing bad day, or — in more serious cases — thoughts about death or self-harm. These often show up first in academic performance.
Changes in Behaviour
Withdrawal from friends, family, and activities they once loved. Sudden outbursts of anger or tearfulness over small triggers. Regression to younger behaviours. Increased secrecy or risk-taking. These patterns, when sustained, are significant.
Changes in Physical Health
Unexplained headaches or stomach aches — especially before school — persistent fatigue, disrupted sleep, or significant unexplained weight changes. The body often speaks when words fail.
According to CMHA Ontario, the critical question is not whether any of these behaviours appear — many are part of normal development — but whether they are lasting, severe, out of character, or getting in the way of daily life. A child who is sad for a week after a loss is grieving. A child who has been withdrawn and refusing school for two months is showing something that warrants professional attention.
By the Numbers
What U.S. and Canadian Data Tell Us About the Scope
Anxiety — Most Common
11%
of U.S. children ages 3–17 have a current diagnosed anxiety disorder — higher among girls (12%) than boys (9%).
Behaviour Disorders
8%
of U.S. children ages 3–17 have a current diagnosed behaviour disorder — more common in boys (10%) than girls (5%).
Adolescent Crisis
20%
of U.S. high school students reported seriously considering suicide in 2023. 20% of adolescents also had unmet mental health care needs.
Sources: U.S. Centers for Disease Control and Prevention (CDC), Data and Statistics on Children's Mental Health, June 2025 | National Survey of Children's Health (2022–2023) | Youth Risk Behavior Survey Data Summary & Trends Report: 2013–2023 | CMHA Ontario
When You See the Signs: Where Early Action Leads
The data from both the CDC and CMHA Ontario point in the same direction: early identification dramatically changes outcomes. Children who receive support before symptoms entrench are less likely to develop severe adult mental illness, more likely to succeed academically, and better equipped to build healthy relationships.
Positive childhood experiences act as a genuine buffer. CDC data from adolescents ages 12–17 show that 79% have at least one adult who makes a meaningful positive difference in their life. Peer support, parent connection, and active engagement in school or sports all measurably reduce risk. The presence of safe, stable, nurturing relationships is itself a form of prevention.
Practical First Steps for Parents & Caregivers
Start with your family doctor. They can rule out physical causes, provide referrals, and connect you with local mental health services. This is the first and most accessible door.
Talk to teachers and school counsellors. They see your child in a different context and may have noticed changes you haven't. Schools increasingly offer mental health programs and early intervention supports.
Be honest with siblings and extended family. Naming what's happening reduces stigma within the home and gives your child multiple sources of support rather than one.
Contact your local CMHA branch (Ontario residents). CMHA Ontario and affiliated branches can connect families with community programs, peer support workers, and mental health services tailored to children and youth.
Involve mental health professionals early. Psychiatrists, psychologists, social workers, and counsellors all play different roles. Early therapy can be transformative — especially before patterns solidify in adolescence.
The Gap Between Distress and Diagnosis — and Why It Persists
One of the most important points buried inside the CDC's data is this: diagnosed conditions only tell part of the story. A child can carry the full weight of a mental health condition without ever receiving a formal diagnosis — either because the symptoms don't yet meet clinical criteria, because access to care is limited, or because no one in their life recognised what was happening.
Among U.S. adolescents, 20% reported having unmet mental health care needs in 2021–2023. That's one in five teenagers who knew they needed help and couldn't get it. In Ontario, approximately one in five children and youth lives with a mental health challenge — yet the majority still face significant delays before receiving support.
Closing that gap starts not in clinics but in living rooms, schoolyards, and sports fields — wherever a caring adult is paying attention. The science, the statistics, and the stories all converge on one truth: noticing early, and responding without judgment, is the most powerful intervention available.
Citations & Credibility
1. Canadian Mental Health Association (CMHA) Ontario
Child and Youth Mental Health: Signs and Symptoms
Published by CMHA Ontario with support from Kids Help Phone and the Ontario Ministry of Children and Youth Services.
ontario.cmha.ca/documents/child-and-youth-mental-health-signs-and-symptoms/
2. Centers for Disease Control and Prevention (CDC)
Data and Statistics on Children's Mental Health — Updated June 5, 2025.
Draws on: National Survey of Children's Health (2022–2023); National Health Interview Survey – Teen (2021–2023); Youth Risk Behavior Survey Data Summary & Trends Report: 2013–2023; Leeb et al. (2024), Preventive Chronic Disease.
cdc.gov/children-mental-health/data-research/index.html
3. CMHA Ontario — Children, Youth, and Depression
Details on emotional, physical, cognitive, and behavioural warning signs of depression in young people.
ontario.cmha.ca/documents/children-youth-and-depression/
This article is intended for informational purposes. It does not constitute medical advice. If you are concerned about a child's mental health, please consult a qualified healthcare professional. In Ontario, you can also contact ConnexOntario at 1-866-531-2600 for referrals to local mental health services. If someone is in crisis, call or text 988 (Canada Suicide Crisis Helpline).
Written by
MedBary Team
Comments
Log in to join the conversation.
Loading comments…