En español
NIDA

Menu

Comorbidity

Brief Description

The term “comorbidity” describes two or more disorders or illnesses occurring in the same person. They can occur at the same time or one after the other. Comorbidity also implies interactions between the illnesses that can worsen the course of both. Learn more

Featured Publications

Publication Cover

Comorbidity: Addiction and Other Mental Illnesses (Research Reports)

Published December 2008. Revised September 2010.
Introduces a report that focuses on the topic of comorbid drug use disorders and other mental illnesses, a research priority for NIDA.

A Functional Variation in the COMT Gene Modulates the Effect of Adolescent Cannabis Use on the Risk of Adult Psychosis graph

Comorbid Drug Abuse and Mental Illness (Topics in Brief)

Revised October 2007.
Provides a research update on comorbid drug abuse and mental illness, exploring why they commonly occur, how common they are, and how they can be diagnosed and treated.

Comorbidity: Addiction and Other Mental Disorders (DrugFacts)

Published March 2011.
Offers basic facts about comorbidity between drug use disorders and other mental illnesses, including why these disorders can co-occur, how common they are, and how they are diagnosed and treated. En Español

Related Resources

Other Resources

Past information on many drugs of abuse is available on our Archives site.

This page was last updated December 2012

Research Report

Research Report Cover

Comorbidity: Addiction and Other Mental Illnesses

Introduces a report that focuses on the topic of comorbid drug use disorders and other mental illnesses, a research priority for NIDA.

Featured Publication

Featured Publication

Drugs, Brains, and Behavior - The Science of Addiction

As a result of scientific research, we know that addiction is a disease that affects both brain and behavior.