Many people in Evanston, Illinois who find their way to 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 Evanston also take part in substance abuse at some time in their lives. These dual diagnosis clients frequently turn to alcohol or drugs to self medicate in an attempt to ease the symptoms of an underlying psychological disorder. Some addicts aren't even diagnosed with a disorder, and only when they begin to receive treatment at a drug rehab center is this sort of psychological condition uncovered. 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 good chance of remaining clean and sober and psychologically stable in the future.