It is quite common for people who have problems with a mental health disorder to also have a co-occurring drug and alcohol abuse issue. In fact, it is more prevalent than one would think and a lot of men and women currently in drug and alcohol treatment centers in Angwin, California may have mental health issues which have just simply been undiagnosed. Rehab professionals at effective drug and alcohol rehab programs in Angwin know how to identify individuals with co-occurring mental and alcohol and drug abuse issues so that both issues can be handled simultaneously while the person is in rehabilitation. Because both need to be addressed, the client should not leave rehab until they are psychologically stable, not just abstinent.