Persons with co-occurring mental and substance abuse disorders must address both issues in order to become fully rehabilitated. Some individuals take drugs or alcohol to alleviate symptoms of mental health complications, and some individuals take drugs which then, in turn, causes symptoms which mimic mental health issues, such as anxiety and depression. Addiction rehabilitation professionals know how to distinguish between the two, and can work with clients to appropriately treat real mental health conditions in tandem with any other substance abuse treatment that is done with the individual. This has proven to be effective in keeping people with mental health problems off of drugs and mentally stable and healthy.