Dual Diagnosis: Treating Depression or Anxiety Alongside Addiction

If you are living with depression, anxiety or the weight of past trauma at the same time as a drinking or drug problem, the two are usually tangled together. The low mood or constant worry makes a substance feel like relief, and over time the substance can deepen the feelings you were trying to escape.

Clinicians call this a dual diagnosis, or co-occurring disorders. This guide explains what that means, why treating both conditions at the same time is recommended, which pairings are most common, how depression and drinking in particular feed each other, and how outpatient programs can address both without an overnight stay.

What is dual diagnosis?

Dual diagnosis means a person has a mental health condition and a substance use disorder at the same time. The mental health side might be depression, an anxiety disorder, bipolar disorder, post-traumatic stress disorder or another condition. The substance side might involve alcohol, opioids, benzodiazepines, stimulants or another drug. SAMHSA defines co-occurring disorders as the coexistence of both a mental health disorder and a substance use disorder, and notes that no specific combination is required (SAMHSA).

It is common. The National Institute on Drug Abuse (NIDA) notes that many people who develop substance use disorders are also diagnosed with other mental health disorders, and vice versa (NIDA). SAMHSA's 2025 National Survey on Drug Use and Health found that 18.5 million U.S. adults, 7.0% of all adults, had both a mental illness and a substance use disorder in the past year. That is about two in five adults with a substance use disorder, and about one in three adults with a mental illness (SAMHSA).

If both are true for you, you are in very large company, and there is a clear, evidence-based way forward.

Why do mental illness and addiction occur together?

NIDA and the National Institute of Mental Health (NIMH) describe several overlapping explanations, and for most people more than one applies (NIDA, NIMH).

Shared risk factors

Substance use disorders and other mental disorders share risk factors, including inherited characteristics, adverse social environments, trauma and stress. Childhood trauma is a significant thread. It raises the risk of substance use, other mental disorders and suicidality, and one analysis estimated that over 30% of adults with a substance use disorder had experienced childhood trauma, including emotional abuse, sexual abuse or neglect (NIDA).

A mental health condition can lead to substance use

People who experience anxiety, stress, depression or pain may use drugs to try to feel better, especially when they lack access to mental health care. NIDA notes that although some substances may temporarily reduce symptoms of a mental disorder, they can also make symptoms worse, both immediately and in the long run (NIDA). NIMH adds that some mental disorders change the brain in ways that can make substances feel more rewarding, which further raises the risk (NIMH).

Substance use can change the brain in ways that worsen mental illness

Substance use can lead to changes in some of the same brain areas that are disrupted in conditions like anxiety, mood and impulse-control disorders and schizophrenia. NIDA points to evidence that cocaine use may worsen the symptoms of bipolar disorder, and that cannabis use is linked to earlier onset of psychosis in people with a genetic risk (NIDA). Early abstinence can be hard on mood as well. NIDA notes that when people first stop using drugs, they can experience restlessness, sleeplessness, depression and anxiety (NIDA).

Because the influence can run in both directions, NIDA advises treating co-occurring conditions at the same time rather than separately (NIDA). That is the case for integrated care.

Which conditions most commonly pair with addiction?

NIMH notes that many people with substance use disorders also experience depression, anxiety or bipolar disorder, and that people with mental disorders are at higher risk of developing substance use problems (NIMH). SAMHSA's list of the most common co-occurring mental disorders also includes post-traumatic stress disorder, ADHD, schizophrenia and conduct disorders (SAMHSA). A few of the most common pairings:

• Depression and substance use. Low mood, loss of interest and hopelessness can drive drinking or drug use, and heavy use can deepen depression. Depression and drinking are covered in detail in the next section.
• Anxiety and substance use. People with anxiety may use alcohol or other substances to feel calmer, yet NIAAA notes that as alcohol wears off, people can feel more restless and anxious than before they drank (NIAAA). This pairing is covered in depth in the guide to anxiety and addiction treatment.
• Bipolar disorder and substance use. NIMH names bipolar disorder among the conditions many people with substance use disorders also experience, and NIDA notes evidence that cocaine use may worsen bipolar symptoms and contribute to the illness's progression.
• PTSD and trauma with substance use. NIDA lists post-traumatic stress disorder among the mental disorders that commonly co-occur with substance use disorders, and notes that trauma raises the risk of both.
• ADHD and substance use. NIDA notes that research links ADHD to the same brain changes associated with drug cravings, which may explain why people with both often report stronger cravings.

It is also worth separating an independent disorder from symptoms a substance is producing. Some anxiety or low mood is substance-induced, meaning it develops during intoxication or withdrawal and eases with stable abstinence. Our explainer on substance-induced anxiety disorder walks through how clinicians tell the difference. For depression and alcohol, the typical recommendation is to wait about four weeks into abstinence before settling on a diagnosis of independent depression (McHugh and Weiss, 2019).

Depression and drinking: how the two feed each other

Depression and alcohol use disorder are among the most common psychiatric conditions, and a review in Alcohol Research: Current Reviews, the journal of the National Institute on Alcohol Abuse and Alcoholism (NIAAA), found that they occur together more often than would be expected by chance. Depressive disorders are the most common co-occurring psychiatric conditions among people with alcohol use disorder (McHugh and Weiss, 2019). NIAAA adds that people with alcohol use disorder are more likely to have major depression or anxiety over their lifetime (NIAAA).

How drinking affects mood

Alcohol is a central nervous system depressant. It slows brain activity and can change mood, behavior and self-control (MedlinePlus). It also works against the things that protect mood. People may fall asleep faster after drinking, but their sleep is fragmented and they tend to wake earlier. As the effects wear off, the brain's adjustment to alcohol can leave people more restless and anxious than before they drank (NIAAA).

Heavy drinking can also produce depression directly. Alcohol-induced depressive disorder is low mood or loss of interest that appears during or shortly after heavy drinking or withdrawal and lifts after about three to four weeks without alcohol. Even so, it is associated with a risk of independent depression, so the review recommends considering treatment and watching mood closely rather than assuming it will pass (McHugh and Weiss, 2019).

How depression drives drinking

The same review describes three pathways that can explain the overlap: depression raises the risk of alcohol use disorder, alcohol use disorder raises the risk of depression, and the two share underlying risk factors. The order can differ by gender. In retrospective studies, women were more likely to experience depression before alcohol use disorder, and men were more likely to develop alcohol use disorder first (McHugh and Weiss, 2019).

Whatever came first, the combination is harder than either alone. When alcohol use disorder and depression occur together, both tend to be more severe and have worse outcomes, including a heightened risk of suicidal behavior (McHugh and Weiss, 2019). One of the eleven questions a health care provider might ask to assess alcohol use disorder is whether a person has kept drinking even though it was making them feel depressed or anxious (NIAAA).

Why treating both together helps

NIAAA advises that when addressing drinking problems, it is important to also treat any accompanying mental health conditions (NIAAA). The research supports doing both at once:

• Depressive symptoms have been shown to improve significantly after a period without alcohol, typically three to four weeks, so treating the drinking helps the mood.
• For people with both conditions, antidepressants are more effective than placebo at reducing depression, although their effect on drinking is modest.
• A meta-analysis of 12 studies found that combining motivational interviewing and cognitive behavioral therapy produced significant but modest improvements in both depression and drinking.

(McHugh and Weiss, 2019)

In practice, that means an assessment that looks at mood and drinking together, therapy that builds skills for both, medication for depression when it is indicated, and medication for alcohol use disorder when it fits. If low mood persists after the first month without alcohol, that is a signal to treat the depression in its own right.

Why integrated treatment is recommended

NIDA reports that when someone has co-occurring conditions, it is usually better to treat them at the same time rather than separately, and that this can make all the treatments more effective and improve health outcomes. Its research summary adds that integrated treatment leads to better health outcomes for people with substance use and other mental disorders, and that people entering treatment for one can be screened for the other (NIDA). NIDA's research-based principles of treatment make the same point: when these problems co-occur, treatment should address all of them, including with medications as appropriate (NIDA).

NIDA also notes that people with co-occurring disorders typically have a harder time staying in treatment and following treatment guidelines, which leads to worse health outcomes (NIDA). A single coordinated plan is one way to close that gap.

In plain terms, integrated treatment means one team, one assessment and one coordinated plan. NIMH describes integrated care as combining mental health and substance use treatment so patients can receive more convenient, coordinated care in one place, and notes that providers experienced in both can use comprehensive assessment tools to reduce the chance of a missed diagnosis (NIMH). The therapist treating your depression knows what is happening in your relapse-prevention group, and the prescriber managing your medication knows your full substance use history. SAMHSA's Integrated Treatment for Co-Occurring Disorders toolkit sets out practice principles for this kind of care, with advice from programs that deliver it.

For more on how the two are brought together in practice, see integrating mental health care in addiction treatment.

How outpatient programs treat both together

Integrated dual diagnosis care does not always require an inpatient stay. For many people, structured outpatient programs deliver it while they keep living at home, working or caring for family. At Clear Steps Recovery, the levels of care have different names in each state:

• Day Treatment. Full clinical days on weekdays with no overnight stay, for people who need the most structure and daily contact with the clinical team. In New Hampshire, insurers may call this a partial hospitalization program (PHP). In Massachusetts it is called Day Treatment.
• Intensive outpatient care in New Hampshire. Structured group and individual treatment several days a week, with fewer hours than Day Treatment. In Londonderry, this includes a daytime intensive outpatient program (IOP) and an Evening IOP that meets Monday through Thursday from 6 to 9 pm.
• Evening Treatment in Massachusetts. In Needham, Evening Treatment is a structured outpatient program on an after-work schedule, meeting Monday through Thursday from 6 to 9 pm.
• Outpatient care. Regular sessions, often weekly, for people who are more stable or stepping down from a more intensive level.

In every setting, a dual diagnosis plan usually blends several elements:

• Evidence-based therapy. Cognitive behavioral therapy targets the thought patterns that fuel low mood, anxiety and substance use. NIMH lists cognitive behavioral therapy, contingency management and motivational interviewing among the behavioral therapies that help people manage co-occurring conditions (NIMH).
• Medication management. Medications for depression, anxiety or other conditions are coordinated with any addiction medications. NIMH notes that medications can effectively treat opioid and alcohol addiction and lessen the symptoms of many other mental disorders (NIMH). Where alcohol or opioid use disorder is involved, our medication-assisted treatment program pairs FDA-approved medications with counseling.
• Group and family work. Group sessions build skills alongside peers, and family involvement can help too. NIAAA reports that strong family support through family therapy increases the chances of staying abstinent from alcohol compared with individual counseling alone (NIAAA).
• Aftercare planning. A relapse-prevention and continuing-care plan keeps support in place after the program ends through our aftercare program.

A clinical assessment decides the right starting level. The goal is to match the intensity of care to the severity of both conditions and to your safety and support at home. NIAAA's guidance on finding help suggests asking whether a program addresses mental health issues together with alcohol treatment, which is what integrated care does (NIAAA).

A note on safety

Do not stop heavy drinking or benzodiazepines abruptly on your own. When someone who has been drinking heavily for a long time stops suddenly, withdrawal can be painful or even life-threatening, with symptoms that can include seizures (NIAAA). The FDA warns that stopping benzodiazepines abruptly or cutting the dose too quickly can cause withdrawal reactions, including seizures, which can be life-threatening (FDA). A medically supervised plan is the safe path. If a mental health crisis is part of the picture, the 988 Suicide and Crisis Lifeline (call or text 988) is available at any hour.

Finding the right starting point

NIDA reports that treating co-occurring conditions at the same time is usually better than treating them separately (NIDA). With an integrated plan, the right therapy, appropriate medication and a coordinated team, both sides of a dual diagnosis can be addressed at once.

When you are weighing programs, it helps to ask whether a center treats mental health and substance use together, what levels of care it offers, and how it matches the intensity of care to your situation. Clear Steps Recovery treats co-occurring mental health conditions and substance use at its mental health and dual diagnosis program in Londonderry, New Hampshire and its mental health treatment program in Needham, Massachusetts, and a clinical assessment is usually the first step in sorting out where to begin.

If you or someone you are with is in crisis, call or text the 988 Suicide and Crisis Lifeline, or reach the SAMHSA National Helpline at 1-800-662-4357 (free, confidential, 24/7).