It is not uncommon for people who have problems with a psychological issue to also be plagued by a co-occurring drug and alcohol abuse disorder. In truth, it is more common than one would assume and many people currently in alcohol and drug rehab centers in Whittier, California may have mental health disorders which are often undiagnosed. Rehab experts at successful drug rehab programs in Whittier know how to identify individuals with co-occurring mental and substance abuse disorders in hopes that these two concerns can be handled simultaneously while the person is in rehabilitation. Due to the fact both need to be addressed, the individual should not leave treatment until they are mentally stable, not just off of drubs.