The Link Between Mental Health and Substance Misuse

Treating addiction without treating the anxiety, depression, or trauma underneath it rarely works for long — and treating mental illness while ignoring active substance use doesn't work well either. The two have to be addressed together.

Quick Answer: How Are Mental Health and Substance Misuse Connected?

An estimated 21.2 million U.S. adults had a co-occurring mental illness and substance use disorder in the past year, and 31.5% of adults with any mental illness also met criteria for a substance use disorder. SAMHSA Each condition can trigger or worsen the other, which is why integrated treatment — addressing both at once — produces better outcomes than treating either alone.

Why Do Mental Health and Substance Misuse Often Occur Together?

The relationship runs in both directions:

• Self-medication. People with untreated anxiety, depression, or trauma sometimes use alcohol or drugs to cope, which can develop into a substance use disorder.

• Brain chemistry. Substance use can trigger or intensify symptoms of depression, anxiety, and other conditions, especially with heavy or prolonged use.

• Shared risk factors. Genetics, trauma, and chronic stress raise the risk for both conditions independently.

What Is the Treatment Gap?

Despite how common co-occurring conditions are, only 14.5% of adults with both conditions received treatment for both in the past year — 41.2% received no treatment at all for either. Among adolescents with co-occurring depression and a substance use disorder, 27.9% received no treatment of either kind. SAMHSA

What Does Effective Treatment Look Like?

• Integrated care. Treating mental health and substance use together, ideally with one coordinated care team, rather than requiring one condition to be “fixed” before addressing the other.

• Behavioral therapy. Approaches like cognitive behavioral therapy address the thought patterns underlying both conditions.

• Medication when appropriate. For some people, medication for depression, anxiety, or substance cravings supports recovery from both.

• Peer and family support. Ongoing connection significantly improves long-term outcomes for co-occurring conditions.

Get Support in the Piedmont Region

• Download our free resource guide for local integrated treatment and mental health contacts.

• Join the coalition to help expand access to co-occurring care in your community.

Frequently Asked Questions

Which comes first, mental illness or substance misuse?

It varies by person — sometimes untreated mental health symptoms lead to self-medication, and sometimes substance use triggers or worsens mental health symptoms. Either way, both need to be addressed.

Do I need two separate treatment providers?

Not ideally. Integrated treatment programs that address both conditions together, with one coordinated team, tend to produce better outcomes than treating them separately or sequentially.

What should I do if I think a family member has both a mental health and substance use issue?

Start with an honest conversation and encourage a professional assessment — our resource guide lists local providers who treat co-occurring conditions.

Key Takeaways

• 21.2 million U.S. adults have a co-occurring mental illness and substance use disorder.

• 31.5% of adults with any mental illness also meet criteria for a substance use disorder.

• Only 14.5% of adults with both conditions receive treatment for both — most get partial or no treatment.

• Integrated treatment, addressing both conditions together, produces the best outcomes.