Why Teen Substance Use Rarely Happens Without a Co-Occurring Condition

Marcus’s parents brought him in for what they described as a drinking problem. Three weeks into treatment, a clinician asked when he’d first started feeling like he couldn’t get out of bed some mornings, and Marcus looked genuinely surprised that anyone had connected the two. He’d been managing a depression he’d never named to a doctor for almost two years before he ever touched alcohol. The drinking wasn’t a separate problem that happened to show up alongside the depression. For him, it had always been the same problem wearing two different faces.

That pattern is closer to the rule than the exception, and it changes what actually needs to happen for treatment to work.

One Condition Rarely Shows Up Alone

Substance use in adolescents is frequently tied to an underlying mental health condition rather than existing on its own. Anxiety, depression, trauma, ADHD, and mood dysregulation are among the most common conditions that appear alongside teen substance use, and treating the substance use without addressing what’s underneath it tends to leave the actual driver of the behavior untouched.

A 2024 study published in Frontiers in Child and Adolescent Psychiatry looked at youths receiving mental health treatment and examined how often a co-occurring substance use problem showed up depending on their primary diagnosis. Among youth with depression as their primary diagnosis, about 10% had high-risk substance use or a diagnosable substance use disorder. Among those with anxiety or ADHD as the primary diagnosis, the rate was about 5% in each group. Boys had higher odds than girls of a co-occurring substance use problem across every category studied.

What makes this data useful isn’t just the percentages. It’s the direction it points a parent or a clinician in. If depression carries roughly double the co-occurrence rate of anxiety or ADHD, a teen who’s already been struggling with low mood, withdrawal from friends, or a flattened interest in things they used to care about is walking into substance use with a different risk profile than a teen whose main struggle has been difficulty focusing in school. Neither profile is more legitimate than the other, but they call for different questions during an intake conversation, not the same checklist applied the same way to every new admission.

Trauma complicates the picture further, and it doesn’t always announce itself the way depression or anxiety tends to. A teen who’s experienced a significant loss, a chaotic home environment, or an event they’ve never fully talked about with an adult may not describe it as trauma at all, sometimes because they don’t recognize it as trauma themselves. Substance use in that context can function as a way of turning the volume down on something nobody has asked about directly, which is part of why a screening conversation limited to drug and alcohol questions tends to miss where the behavior actually started.

What the Research Actually Shows

The scale of the gap between need and treatment is documented directly by national survey data. According to SAMHSA’s National Survey on Drug Use and Health, an estimated 922,000 adolescents ages 12 to 17 had a co-occurring major depressive episode and substance use disorder in a recent survey year. Just over 71% received either mental health treatment or substance use treatment. More than a quarter, 28.4%, received neither.

Older SAMHSA data adds a more specific and more troubling detail. Among adolescents with a co-occurring major depressive episode and substance use disorder, only 5.4% received both mental health care and specialty substance use treatment together. Nearly 60% received mental health care alone, with the substance use going unaddressed. Fewer than 1% received substance use treatment alone, with the underlying mental health condition left untreated. Even among teens who did get help, the two problems were rarely treated as connected.

Put those two data sets side by side and a pattern emerges that matters more than either number on its own. It’s not simply that teens with co-occurring conditions go without help. It’s that the help they do get is frequently split across two separate systems that don’t talk to each other: a therapist addressing the depression without ever asking about substance use, or a substance use program addressing the drinking without screening for what’s driving it. A teen can be, technically, “in treatment” on paper while the actual mechanism connecting their mood and their use goes completely unaddressed by anyone in the room.

Why This Matters for Choosing a Program

None of this is about assigning one condition more importance than the other. It’s about recognizing they’re often tangled together:

• Screening for depression, anxiety, trauma, and ADHD should happen alongside substance use assessment, not after it
• A program that only addresses the substance use risks leaving the actual trigger active
• A program that only addresses the mental health condition risks leaving the substance use unmanaged
• Family involvement matters for both halves of the picture, not just one
• Progress in one area doesn’t necessarily mean the other is improving too

A teen who stops drinking without ever getting support for the depression underneath it hasn’t resolved the problem. They’ve just removed one of its symptoms.

Where This Fits

A residential treatment program built to screen for and treat co-occurring mental health conditions alongside substance use, rather than treating them as separate issues on separate tracks, is aligned with what the data consistently shows matters. Odyssey House’s own description of the adolescents it serves reflects exactly this pattern: young people whose substance use rarely shows up in isolation from anxiety, depression, trauma, or ADHD.

Marcus’s treatment plan changed the week that the clinician asked about his mornings. Drinking was still part of the work. So, finally, was the depression that had been there long before it.

Sources

• Substance Abuse and Mental Health Services Administration. (2023). 2022 National Survey on Drug Use and Health: Highlights. U.S. Department of Health and Human Services.
• Substance Abuse and Mental Health Services Administration. (2018 data). Cited in: Co-occurring Mental Illness and Substance-Use Disorders. S. Pharmacist.
• Frontiers in Child and Adolescent Psychiatry. (2024). Prevalence of co-occurring conditions among youths receiving treatment with primary anxiety, ADHD, or depressive disorder diagnoses. https://doi.org/10.3389/frcha.2024.1340480