It is quite common for individuals who are afflicted with a mental health disorder to also be plagued by a co-occurring drug and alcohol abuse issue. In truth, it is more prevalent than one would imagine and many people currently in drug treatment programs in Clarendon Hills, IL. may have mental health issues which are often undiagnosed. Treatment professionals at successful drug rehabilitation facilities in Clarendon Hills, IL. know how to identify individuals with co-occurring mental and drug and alcohol abuse issues in hopes that both issues can be handled simultaneously while the person is in rehab. Because both need to be addressed, the person must remain in rehab until they are psychologically stable, not just sober.