It is quite common for people who have problems with a mental health disorder to also be plagued by a co-occurring alcohol and drug abuse issue. Frankly, it is more prevalent than one would imagine and quite a few people presently in drug and alcohol treatment centers in La Mirada, California may have mental health issues which are often undiagnosed. Rehabilitation professionals at effective drug and alcohol rehab programs in La Mirada know how to identify persons with co-occurring mental and drug and alcohol abuse disorders so that both issues can be handled simultaneously while the person is in rehab. Simply because both must be resolved, the person should not leave treatment until they are psychologically stable, not just abstinent.