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