Mild-to-Moderate Depression and Substance Abuse
Depression may occur in people who are diagnosed with other disorders. The term comorbidity applies to the simultaneous diagnosis of two or more psychiatric or medical conditions. It implies that the conditions occur together (or co-occur).
Depression appears to be independent from, but frequently co-occurs with, substance abuse disorders, including alcohol and drug abuse. Many people with depression turn to alcohol or drugs, eventually developing a dependence or addiction. Conversely, people who are addicted to alcohol or drugs have a high rate of depression. Alcohol and some drugs are depressants, and depressed mood can be a direct outcome of substance abuse. Use of alcohol by people suffering from depression can increase the severity of their depressive symptoms.
Research has shown an increased risk of substance abuse or dependence among people with mild-to-moderate depression. Studies have reported a comorbidity rate of 21% for mild-to-moderate depression and substance abuse, and of 19% for mild-to-moderate depression and drug abuse (apart from alcohol abuse).
