Dual Diagnosis Treatment: When Addiction and Mental Health Are the Same Problem

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Written by the Coastwise Clinical Team

Dual diagnosis is common among the clients Coastwise sees from Long Beach, San Pedro, Torrance, and the greater South Bay, and it's often the reason outpatient care has felt like "almost enough" to families who have already tried it. When someone is struggling with both a substance use problem and a mental health condition, treating one without the other rarely works. The anxiety that drove the drinking is still there when the drinking stops. The depression that made opioids feel like relief doesn't disappear when the opioids do. The trauma underneath a long pattern of substance use keeps pulling at someone until it gets addressed directly.

This is why dual diagnosis treatment matters. It recognizes that mental health and addiction are not separate problems to solve in sequence. They are often the same problem showing up in two dimensions, and they need to be treated together.

What dual diagnosis actually means

Dual diagnosis, also called co-occurring disorders, is the clinical term for having both a substance use disorder and a mental health condition at the same time.

This is not rare. According to national data from SAMHSA, roughly half of people with a substance use disorder also have a co-occurring mental health condition. For many clients, the conditions are intertwined: the mental health condition may be driving the substance use, and the substance use is making the mental health condition worse over time.

The combinations that show up most in clinical practice

Any mental health condition can co-occur with any substance use disorder, but some combinations are especially common.

Anxiety and alcohol. Alcohol temporarily dampens anxiety, making it an easy form of self-medication. Over time, regular drinking to manage anxiety leads to tolerance, dependence, and often worsening baseline anxiety when not drinking, because alcohol withdrawal raises anxiety. This is one of the most common dual diagnosis patterns clinicians see.

Depression and alcohol or opioids. Alcohol and opioids can temporarily blunt depressive pain, but both are depressants and worsen depression over time. Clients often describe a cycle of using to feel less bad, feeling worse afterward, and using more.

PTSD and substance use. Trauma survivors often turn to substances to manage hyperarousal, intrusive memories, or emotional numbing. Untreated trauma is one of the most consistent predictors of substance use and relapse. Targeted trauma treatment like EMDR is often essential for lasting recovery in this combination.

Bipolar disorder and substance use. Rates of substance use are meaningfully higher in people with bipolar disorder than in the general population. Substance use can trigger mood episodes, and mood episodes, especially mania, often lead to impulsive substance use. Care that coordinates therapy with a prescriber managing mood is particularly important here.

ADHD and stimulant or cannabis use. Undiagnosed or undertreated ADHD is linked to higher rates of substance use, especially cannabis and stimulants. Proper ADHD treatment can meaningfully reduce substance use patterns that started as self-medication.

Why treating only one side usually fails

For much of the history of addiction treatment, the dominant model was sequential: first get clean, then address mental health. This approach consistently produced poor outcomes.

If someone is drinking to manage anxiety, and they get sober without treating the anxiety, the anxiety comes back full force. The tool that was managing it is gone. The pressure to return to drinking is enormous. This is not a failure of willpower. It is a predictable consequence of leaving the underlying driver untouched.

The same dynamic applies to every common dual diagnosis combination. Untreated depression drives relapse on opioids. Untreated PTSD drives relapse on alcohol. Untreated ADHD drives relapse on cannabis or stimulants. When the mental health condition is left alone, substance use tends to return as the familiar way of managing it.

The research on this is clear: integrated treatment, where both conditions are addressed at the same time by the same clinical team, produces better long-term outcomes than treating them separately or in sequence.

What integrated dual diagnosis treatment looks like at Coastwise

Coastwise's individual outpatient therapy treats co-occurring disorders within one coordinated clinical team rather than referring them out to separate providers.

Integrated outpatient therapy at Coastwise includes:

• A clinical assessment to identify co-occurring conditions and understand what's driving the substance use
• Individual therapy with licensed clinicians trained in both substance use treatment and mental health
• Work on relapse prevention alongside emotional regulation, distress tolerance, and interpersonal skills
• Specialty modalities: EMDR for trauma-driven substance use, Ketamine-Assisted Psychotherapy for treatment-resistant depression or PTSD, CBT for anxiety and depression, DBT for emotional regulation
• Coordination with your other providers and external supports when that helps your care
• Family involvement, because dual diagnosis affects the whole family system and family support matters for recovery

The mental health and substance use pieces are treated together, not siloed.

Can dual diagnosis be treated in outpatient therapy?

Yes, and for many people it can be treated effectively in outpatient therapy. A common misconception is that dual diagnosis always requires a higher level of care. Much of it can be addressed in individual outpatient therapy, and there's often a clinical advantage to doing so: outpatient therapy integrates into the client's real life, where their mental health symptoms and substance use patterns actually play out. Skills learned in session get practiced in the environment where they're needed.

A higher level of care may be indicated in specific situations, including acute psychiatric instability or severe withdrawal risk, and when that's the right fit we'll help you find it. For many people, though, ongoing one-on-one therapy is enough to do the work.

Does insurance cover dual diagnosis treatment?

We work with insurance, and many clients use their benefits toward care with us. Call (424) 536-3002 to learn how your insurance can help cover the cost of therapy.

Our care team will walk you through how your benefits may apply, at no cost. Call (424) 536-3002 or reach out online.

Getting started at Coastwise

If you suspect you have a co-occurring mental health condition alongside substance use, or you know you do but haven't found a therapist who takes both seriously, start with a free clinical assessment. Our care team will evaluate both dimensions and match you with the right therapist through Coastwise Health.

Call (424) 536-3002 or request a consultation online. Monday through Friday, 9:00 AM to 8:00 PM.

Located at 1366 W 7th Street, San Pedro, CA.