It is quite common for people who are afflicted with a psychological issue to also be plagued by a co-occurring drug and alcohol abuse disorder. In fact, it is more prevalent than one would think and many individuals presently in drug and alcohol rehab centers in Castro Valley, California may have mental health issues which are often undiagnosed. Rehabilitation professionals at effective drug and alcohol treatment programs in Castro Valley know how to spot individuals with co-occurring psychological and drug and alcohol abuse issues so that these two issues can be simultaneously addressed while the person is in treatment. Because both need to be addressed, the person should not leave rehab until they are mentally stable, not just sober.