Many individuals in Lerna, Illinois who end up in drug rehab are dual diagnosis clients with co-occurring mental and substance abuse problems. In fact, as many as 1/3 of those who suffer with mental health issues in Lerna also take part in substance abuse at some point in their lives. These dual diagnosis clients typically turn to alcohol or drugs to self medicate as a way to alleviate the symptoms of an underlying psychological disorder. Some addicts aren't even diagnosed with a disorder, and only when they make it to a drug rehab facility is this sort of psychological condition brought to light. This in itself can sometimes help resolve addiction issues and put the person in a position to get rehabilitation for both conditions so that they have a strong chance of remaining abstinent and psychologically healthy in the future.