Many people who struggle with addiction are also living with a mental health condition at the same time. This combination is known as dual diagnosis, or more commonly, co-occurring disorders. Understanding what this means — and why it matters — is the first step toward getting the right kind of help.

Co-occurring disorders are more common than most people realize. According to national research, roughly half of people with a substance use disorder also experience a mental health condition such as depression, anxiety, PTSD, or bipolar disorder. These conditions don’t just exist side by side. They often fuel each other in ways that make both harder to manage.

The good news is that co-occurring disorders are treatable. With the right support and an integrated approach to care, many people find a path forward. If you or someone you love is facing both a mental health challenge and a substance use issue, you are not alone — and compassionate help is available.

What Are Co-Occurring Disorders?

A co-occurring disorder simply means that a person is experiencing two or more conditions at the same time. One is typically a substance use disorder — such as alcohol use disorder or opioid addiction — and the other is a mental health condition like depression, anxiety, PTSD, or a personality disorder.

These conditions often develop together, though the order varies from person to person. Sometimes a mental health condition appears first, and a person turns to substances to cope with difficult emotions or experiences. Other times, prolonged substance use triggers or worsens mental health symptoms. In many cases, shared risk factors — such as genetics, trauma history, or chronic stress — contribute to both conditions developing at once.

Common Mental Health Conditions Paired With Addiction

While co-occurring disorders can involve almost any combination of conditions, some pairings appear more frequently than others. These include:

• Depression and alcohol use disorder — Alcohol is a depressant, and heavy use can deepen depressive symptoms over time.
• Anxiety disorders and benzodiazepine or cannabis use — People often self-medicate anxiety with substances that provide short-term relief.
• PTSD and opioid or alcohol use disorder — Trauma survivors sometimes use substances to numb painful memories or hyperarousal symptoms.
• Bipolar disorder and stimulant or alcohol use — The highs and lows of bipolar disorder can be intertwined with cycles of substance use.
• ADHD and stimulant misuse — Undiagnosed or undertreated ADHD can lead to self-medication with stimulants or other drugs.

Recognizing the specific combination of conditions a person is experiencing is essential. It shapes the entire approach to treatment.

Why Treating Both Conditions Together Matters

For a long time, the mental health and addiction treatment fields operated separately. A person might receive help for their depression at one facility while their substance use was addressed somewhere else entirely. However, research has shown clearly that this fragmented approach often falls short.

When only one condition is treated, the untreated condition can undermine progress on the other. For example, if someone receives addiction treatment but their underlying trauma goes unaddressed, unresolved emotional pain may increase the risk of returning to substance use. Similarly, treating only the mental health condition while ignoring active addiction limits how effective that treatment can be.

Integrated treatment — addressing both conditions simultaneously within the same program — tends to produce better outcomes. It allows clinicians to understand the full picture of what a person is experiencing and tailor care accordingly.

The Role of Psychiatric Assessment

A thorough psychiatric assessment is a cornerstone of integrated co-occurring disorder treatment. This evaluation helps clinicians understand a person’s complete mental health history, current symptoms, substance use patterns, trauma background, and any medical factors that may be contributing to their condition.

At Milestone Recovery in Phoenix, Arizona, every client receives a comprehensive psychiatric assessment at the start of their care. This process ensures that treatment plans are individualized — not one-size-fits-all — and that any underlying mental health conditions are identified and addressed from the very beginning.

Evidence-Based Approaches to Co-Occurring Disorder Treatment

Effective treatment for co-occurring disorders draws on a range of evidence-based therapies. These are approaches that have been studied and validated through clinical research. They form the backbone of quality integrated care.

Cognitive Behavioral Therapy (CBT)

Cognitive behavioral therapy is one of the most widely used and well-researched therapies for both mental health and substance use disorders. CBT helps people identify the thoughts, beliefs, and patterns that contribute to their struggles. By learning to recognize and challenge unhelpful thinking, clients can develop healthier coping strategies and responses to stress.

In the context of co-occurring disorders, CBT is especially useful because it addresses both the cognitive patterns that underlie mental health symptoms and the thought-behavior cycles that sustain addiction.

Dialectical Behavior Therapy (DBT)

Dialectical behavior therapy, or DBT, was originally developed to treat borderline personality disorder. However, it has since proven highly effective for a broad range of emotional regulation challenges, trauma responses, and substance use issues.

DBT teaches practical skills in four key areas: mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness. These skills are directly relevant to people managing co-occurring disorders, where emotional overwhelm and difficulty coping are often central challenges.

EMDR for Trauma and PTSD

Eye Movement Desensitization and Reprocessing, known as EMDR, is a trauma-focused therapy with strong research support. It helps people process distressing memories in a way that reduces their emotional intensity over time. Because trauma and PTSD are so frequently linked to substance use disorders, EMDR is a valuable tool in co-occurring disorder treatment.

At Milestone Recovery, EMDR is offered as part of a comprehensive, individualized treatment plan for clients whose trauma history is contributing to their current struggles.

Medication-Assisted Treatment (MAT)

For many people with co-occurring disorders, medication plays an important role in stabilizing symptoms and supporting recovery. Medication-assisted treatment, or MAT, combines FDA-approved medications with counseling and behavioral therapies to address substance use disorders. At the same time, psychiatric medication management can help stabilize mood, reduce anxiety, or address other mental health symptoms that make recovery more difficult.

Medication decisions are always made individually, in close collaboration between the client and their treatment team.

What to Expect at a Co-Occurring Disorder Treatment Program

If you or a loved one is considering treatment for co-occurring disorders, it helps to know what the process generally looks like. While every person’s experience is unique, integrated programs typically share a similar structure.

Partial Hospitalization Program (PHP)

A Partial Hospitalization Program, or PHP, provides a high level of structured care without requiring an overnight stay. Clients typically attend programming for several hours each day, several days per week. PHP is well-suited for people who need intensive support — including daily group therapy, individual therapy, psychiatric assessments, and medication management — but who are medically stable and do not require 24-hour supervision.

PHP at Milestone Recovery is designed to create a structured, therapeutic environment where clients can focus deeply on both their mental health and substance use recovery while still returning home in the evenings.

Intensive Outpatient Program (IOP)

An Intensive Outpatient Program, or IOP, offers a flexible yet structured level of care. It is designed for people who need meaningful support but also need to maintain responsibilities such as work, school, or family obligations. IOP typically involves fewer hours per week than PHP, making it more compatible with everyday life.

Milestone Recovery’s IOP provides tailored treatment schedules and continues the evidence-based therapies that clients may have begun at the PHP level. Many clients step down from PHP to IOP as they build strength and stability in their recovery.

Whole-Person Wellness in Co-Occurring Disorder Recovery

Recovery from co-occurring disorders is not only about addressing symptoms. It is about rebuilding a life that feels worth living. That requires attention to the whole person — not just the clinical diagnoses.

At Milestone Recovery, whole-person wellness is woven throughout the treatment experience. This includes nutritional education to support brain and body health, outdoor activities and fitness to reduce stress and boost mood, mindfulness and grounding techniques to build emotional regulation skills, and animal-assisted therapy with Luna, our certified therapy dog, who provides comfort and connection during the healing process.

Additionally, Milestone Recovery offers ketamine-assisted therapy for clients experiencing treatment-resistant depression, trauma, or PTSD. This emerging approach is delivered under close clinical supervision and as part of an individualized treatment plan.

These holistic elements complement evidence-based therapies and help clients develop the habits, skills, and sense of self that support long-term wellbeing.

Taking the First Step Toward Integrated Care

Reaching out for help when you are managing both a mental health condition and a substance use disorder takes real courage. The complexity of co-occurring disorders can feel overwhelming. However, you do not have to figure it out alone.

Milestone Recovery is a Joint Commission accredited treatment center serving Phoenix, Scottsdale, Cave Creek, Mesa, Glendale, and the surrounding Valley. We work with many commercial insurance plans and verify coverage promptly, so that cost concerns do not become a barrier to getting started.

Our team of compassionate clinicians is here to meet you where you are. We will work with you to understand your unique situation and build an individualized plan that addresses both your mental health and substance use needs — together, in an integrated way.

If you are ready to take that first step, reach out to our team at Milestone Recovery today. We are here to help you find a path forward.