Dual Diagnosis: Co-Occurring Disorder Treatment

A dual diagnosis means a person has a substance use disorder and a mental health condition at the same time. The two are tangled together. Someone may drink to quiet anxiety, then find the drinking makes the anxiety worse. The substance use and the mental health condition each feed the other, which is why treating only one of them usually leaves the person stuck.

How common it is

NIDA reports that among adults aged 18 or older who have a mental disorder, 35% also have a substance use disorder, based on the 2023 National Survey on Drug Use and Health. The overlap runs in both directions: people with substance use disorders are more likely than others to have a mental disorder, and people with mental disorders are more likely to develop a substance use disorder.

SAMHSA's 2023 survey counts the scale directly. About 20.4 million adults had co-occurring any mental illness and a substance use disorder in the past year, and about 6.8 million had co-occurring serious mental illness and a substance use disorder. Among all people aged 12 or older, 48.5 million had a substance use disorder of any kind.

Why the conditions travel together

NIDA points to shared risk factors. Inherited traits, trauma, stress, and difficult social environments can raise the risk for both substance use and other mental disorders. One analysis cited by NIDA estimated that more than 30% of adults with a substance use disorder had experienced childhood trauma such as abuse or neglect.

There are also direct effects. People who feel anxious, depressed, or in pain may use drugs to try to feel better, especially when mental health care is hard to reach. Some substances briefly ease symptoms but make them worse over time. Cocaine use, for example, may worsen bipolar disorder, and cannabis use has been linked to earlier onset of psychosis in people with genetic risk.

Why integrated care is the standard

The core finding is simple: treat both conditions at the same time. NIDA reports that integrated treatment, which addresses the drug use disorder and the mental illness together, has been found consistently superior to treating each diagnosis separately. When one condition goes untreated, it tends to pull the person back into the other.

Integrated care usually combines several elements: screening for both conditions, a full assessment, cognitive behavioral strategies for coping, motivational support, and medicine when it fits. A team trained in both substance use and mental health coordinates the plan. NIDA notes that people with a mental illness are more likely to drop out of treatment, which is another reason to keep both conditions on one plan.

A gap worth naming

Most people with a dual diagnosis do not get complete care. SAMHSA found that 37.6% of adults with co-occurring mental illness and a substance use disorder received neither substance use treatment nor mental health treatment in the past year. Among those who did receive care, most got only mental health treatment, leaving the substance use disorder unaddressed.

Screening is where that gap starts. SAMHSA's approach asks whether a person who already has one condition shows signs of the other, then moves to a real assessment rather than a label. If you are looking for a program, ask who screens for both conditions and whether psychiatric care is available on site.

Getting help

Use SAMHSA's FindTreatment.gov locator and ask specifically about co-occurring mental health care, not only detox. Or call the SAMHSA National Helpline at 1-800-662-HELP (4357), free and confidential, 24/7.

Call or text (800) 653-9376 or use the form below to talk through options.

Calling is free; the referral service is paid for by treatment providers. Call 911 for an emergency. For suicidal thoughts or a mental health crisis, call or text 988.

Frequently asked questions