Many rehabilitation programs in Delavan, Illinois address people with co-occurring mental and substance abuse disorders. A person who struggles with a mental disorder(s) and substance abuse needs to work through both issues at the same time. Failing to tackle the client's mental disorder(s) during their drug rehabilitation will leave them susceptible to relapse once they leave treatment. Difficulties with mood disorders, anxiety disorders and other mental disorders (schizophrenia, personality disorders, etc.) will come up once back in their day to day life. If the individual does not have a handle on how to manage their mental disorder they will most likely fall back into their old ways of abusing drugs or alcohol as a means of coping and self-medicating.