Depression can be a symptom of an addiction. While it is obviously not the only symptom, it is one of the more dangerous symptoms due to its drive for further addiction. Depression is the leading cause of addiction because of the downward spiral it creates.

Many drugs that are abused cause a sense of euphoria that, once it leaves the body, can lead to depression. This depression then leads to more drug abuse, which in turn causes more depression, that leads to more drugs. This pattern quickly gets out of control and leads to a very destructive lifestyle. Depression is a mental disorder that by itself is difficult to treat alone, but combined with a drug addiction, it can be quite dangerous. Through personal counseling and therapy, however, depression and drug addiction can be successfully defeated.